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Journal articles on the topic 'Seismic coefficients'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Khan, Muhammad Israr, and Shuhong Wang. "SEISMIC ANALYSIS OF A SOIL SLOPE TO DEVELOP CORRELATIONS FOR FACTOR OF SAFETY CONSIDERING HORIZONTAL AND VERTICAL SEISMIC COEFFICIENTS." Engineering Heritage Journal 4, no. 2 (2020): 27–30. http://dx.doi.org/10.26480/gwk.02.2020.27.30.

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Seismic analysis of soil slopes is required to get safe value for slope design. Especially in earthquake zones. Normally a variation in factor of safety values is observed in normal analysis of a slope where seismic coefficients are kept zero as compare to seismic analysis where seismic coefficients are considered in the analysis. In this research, seismic horizontal coefficients are used to find the factors of safety. Correlations are developed between factor of safety values and seismic coefficients. The correlation can be used to find the factor of safety in any slope stability project for

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2

Painter, Scott, Greg Beresford, and Lincoln Paterson. "On the distribution of seismic reflection coefficients and seismic amplitudes." GEOPHYSICS 60, no. 4 (1995): 1187–94. http://dx.doi.org/10.1190/1.1443847.

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Reflection coefficient sequences from 14 wells in Australia have a statistical character consistent with a non‐Gaussian scaling noise model based on the Lévy‐stable family of probability distributions. Experimental histograms of reflection coefficients are accurately approximated by symmetric Lévy‐stable probability density functions with Lévy index between 0.99 and 1.43. These distributions have the same canonical role in mathematical statistics as the Gaussian distribution, but they have slowly decaying tails and infinite moments. The distribution of reflection coefficients is independent of

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3

Dakoulas, Panos, and George Gazetas. "Seismic shear strains and seismic coefficients in dams and embankments." Soil Dynamics and Earthquake Engineering 5, no. 2 (1986): 75–83. http://dx.doi.org/10.1016/0267-7261(86)90001-1.

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4

Zembaty, Zbigniew. "Spatial Seismic Coefficients, Some Sensitivity Results." Journal of Engineering Mechanics 122, no. 4 (1996): 379–82. http://dx.doi.org/10.1061/(asce)0733-9399(1996)122:4(379).

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5

Skopintseva, Lyubov, Milana Ayzenberg, Martin Landrø, Tatyana Nefedkina, and Arkady M. Aizenberg. "Long-offset AVO inversion of PP reflections from plane interfaces using effective reflection coefficients." GEOPHYSICS 76, no. 6 (2011): C65—C79. http://dx.doi.org/10.1190/geo2010-0079.1.

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A conventional amplitude variation with offset (AVO) inversion is based on geometrical seismics which exploit plane-wave reflection coefficients to describe the reflection phenomenon. Widely exploited linearizations of plane-wave coefficients are mostly valid at pre-critical offsets for media with almost flat and weak-contrast interfaces. Existing linearizations do not account for the seismic frequency range by ignoring the frequency content of the wavelet, which is a strong assumption. Plane-wave reflection coefficients do not fully describe the reflection of seismic waves at near-critical an

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6

Choudhury, Deepankar, and K. S. Subba Rao. "Seismic passive resistance in soils for negative wall friction." Canadian Geotechnical Journal 39, no. 4 (2002): 971–81. http://dx.doi.org/10.1139/t02-023.

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In the presence of pseudo-static seismic forces, passive earth pressure coefficients behind retaining walls were generated using the limit equilibrium method of analysis for the negative wall friction angle case (i.e., the wall moves upwards relative to the backfill) with logarithmic spirals as rupture surfaces. Individual density, surcharge, and cohesion components were computed to obtain the total minimum seismic passive resistance in soils by adding together the individual minimum components. The effect of variation in wall batter angle, ground slope, wall friction angle, soil friction angl

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7

Robinson, Enders A. "Seismic time‐invariant convolutional model." GEOPHYSICS 50, no. 12 (1985): 2742–51. http://dx.doi.org/10.1190/1.1441894.

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A layered‐earth seismic model is subdivided into two subsystems. The upper subsystem can have any sequence of reflection coefficients but the lower subsystem has a sequence of reflection coefficients which are small in magnitude and have the characteristics of random white noise. It is shown that if an arbitrary wavelet is the input to the lower lithologic section, the same wavelet convolved with the white sequence of reflection coefficients will be the reflected output. That is, a white sedimentary system passes a wavelet in reflection as a linear time‐invariant filter with impulse response g

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8

Liang, Chen, John Castagna, and Marcelo Benabentos. "Reflectivity decomposition: Theory and application." Interpretation 9, no. 2 (2021): B7—B23. http://dx.doi.org/10.1190/int-2020-0203.1.

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Sparse reflectivity inversion of processed reflection seismic data is intended to produce reflection coefficients that represent boundaries between geologic layers. However, the objective function for sparse inversion is usually dominated by large reflection coefficients, which may result in unstable inversion for weak events, especially those interfering with strong reflections. We have determined that any seismogram can be decomposed according to the characteristics of the inverted reflection coefficients that can be sorted and subset by magnitude, sign, and sequence, and new seismic traces

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9

Huang, Yaping, Hanyong Bao, and Xuemei Qi. "Seismic Random Noise Attenuation Method Based on Variational Mode Decomposition and Correlation Coefficients." Electronics 7, no. 11 (2018): 280. http://dx.doi.org/10.3390/electronics7110280.

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Seismic data is easily affected by random noise during field data acquisition. Therefore, random noise attenuation plays an important role in seismic data processing and interpretation. According to decomposition characteristics of seismic signals by using variational mode decomposition (VMD) and the constraint conditions of correlation coefficients, this paper puts forward a method for random noise attenuation in seismic data, which is called variational mode decomposition correlation coefficients VMDC. Firstly, the original signals were decomposed into intrinsic mode functions (IMFs) with di

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10

Arntsen, Børge, and Bjørn Ursin. "Estimation of reflection coefficients from zero‐offset field data." GEOPHYSICS 58, no. 11 (1993): 1634–45. http://dx.doi.org/10.1190/1.1443379.

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The classical one‐dimensional (1-D) inverse problem consists of estimating reflection coefficients from surface seismic data using the 1-D wave equation. Several authors have found stable solutions to this problem using least‐squares model‐fitting methods. We show that the application of these plane‐wave solutions to seismic data generated with a point source can lead to errors in estimating reflection coefficients. This difficulty is avoided by using a least‐squares model fitting scheme describing vertically traveling waves originating from a point source. It is shown that this method is roug

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11

Xiao, Junrong, De Zhou, Hong Liao, and Jianqun Zhu. "Modified Pseudo-Dynamic Bearing Capacity of Shallow Strip Foundation near Slope on Non-Uniform Soil." Applied Sciences 15, no. 8 (2025): 4365. https://doi.org/10.3390/app15084365.

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In engineering practice, many foundations are forced to be placed on slopes, whose stability is deeply affected by seismic force. Therefore, an accurate assessment of the seismic bearing capacity of strip foundations close to slopes is a crucial guide for engineering. Herein, an analytical procedure considering pseudo-dynamic influence is proposed, which offers a new assessment framework for seismic bearing capacity of strip foundations close to slopes on non-uniform soils. Considering the temporal and spatial characteristics of earthquake action, the seismic bearing capacity of foundations at

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12

&, Mike Warner, and Susan McGeary. "Seismic reflection coefficients from mantle fault zones." Geophysical Journal International 89, no. 1 (1987): 223–30. http://dx.doi.org/10.1111/j.1365-246x.1987.tb04412.x.

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13

Warner, Mike. "Absolute reflection coefficients from deep Seismic reflections." Tectonophysics 173, no. 1-4 (1990): 15–23. http://dx.doi.org/10.1016/0040-1951(90)90199-i.

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14

OZDEMIR, H. "MAXIMUM LIKELIHOOD ESTIMATION OF SEISMIC REFLECTION COEFFICIENTS*." Geophysical Prospecting 33, no. 6 (1985): 828–60. http://dx.doi.org/10.1111/j.1365-2478.1985.tb00781.x.

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15

Kumar, Jyant. "Seismic passive earth pressure coefficients for sands." Canadian Geotechnical Journal 38, no. 4 (2001): 876–81. http://dx.doi.org/10.1139/t01-004.

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By taking the failure surface as a combination of the arc of a logarithmic spiral and a straight line, passive earth pressure coefficients in the presence of horizontal pseudostatic earthquake body forces have been computed for an inclined wall placed against cohesionless backfill material. The presence of seismic forces induces a considerable reduction in the passive earth resistance. The reduction increases with an increase in the magnitude of the earthquake acceleration. The effect becomes more predominant for loose sands. The obtained results compared well with those reported in the litera

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16

Santana, T., A. Antão, N. Guerra, and M. Vicente da Silva. "Upper bounds for the 3D seismic active earth pressure coefficients." Géotechnique Letters 12, no. 4 (2022): 1–21. http://dx.doi.org/10.1680/jgele.22.00096.

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A numerical implementation of the upper bound theorem of limit analysis is applied to determine 2D and 3D active horizontal earth pressure coefficients considering seismic actions through a horizontal seismic coefficient. Results are obtained for vertical wall, horizontal soil, different friction angles of the soil, soil-to-wall friction ratios, horizontal seismic coefficients, and wall width-to-height ratios. The few cases for which 3D active earth pressure coefficients are available in the literature using upper-bound methods were used for comparison with the corresponding earth pressure coe

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17

Sutrisno, Sutrisno, and Agus Budiono. "The application of Seismic Coefficients in simple earthquake-resistant houses." Journal of Natural Sciences and Mathematics Research 7, no. 2 (2021): 79–85. http://dx.doi.org/10.21580/jnsmr.2021.7.2.11271.

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After an earthquake, reconstruction and rehabilitation are often carried out. One of them is by building a simple house. A simple house is the one built without involving construction experts, and hence it rarely follows earthquake-resistant building regulations. This study aims to determine and apply seismic coefficient in the planning of earthquake-resistant, simple houses. The seismic coefficient calculation is applied by comparing the maximum ground acceleration with gravity in cities in three provinces, namely Banten, DKI Jakarta, and West Java. From the calculation results in 21 cities i

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18

Naghizadeh, Mostafa, and Mauricio D. Sacchi. "Beyond alias hierarchical scale curvelet interpolation of regularly and irregularly sampled seismic data." GEOPHYSICS 75, no. 6 (2010): WB189—WB202. http://dx.doi.org/10.1190/1.3509468.

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We propose a robust interpolation scheme for aliased regularly sampled seismic data that uses the curvelet transform. In a first pass, the curvelet transform is used to compute the curvelet coefficients of the aliased seismic data. The aforementioned coefficients are divided into two groups of scales: alias-free and alias-contaminated scales. The alias-free curvelet coefficients are upscaled to estimate a mask function that is used to constrain the inversion of the alias-contaminated scale coefficients. The mask function is incorporated into the inversion via a minimum norm least-squares algor

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19

Kuznetsova, Inna, Alexander Uzdin, and Oypasha Sabirova. "Load combinations in performance-based designing of earthquake-resisting structures." MATEC Web of Conferences 239 (2018): 05009. http://dx.doi.org/10.1051/matecconf/201823905009.

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Load combinations for seismic and other loads are considered. To this aim the equiprobable sets of loads with the corresponding probabilities are analyzed. The combination of motor-car and seismic loads is considered in details. The log-normal distribution law was used as a distribution density functions for car load. The distribution of the earthquake event stream was taken according to Poisson's law, which makes it possible to estimate the design seismic intensity. In the frame of this intensity peak ground accelerations were estimated. The dependence of the combination coefficient of the se

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20

Pan, Shulin, Ke Yan, Haiqiang Lan, José Badal, and Ziyu Qin. "A Sparse Spike Deconvolution Algorithm Based on a Recurrent Neural Network and the Iterative Shrinkage-Thresholding Algorithm." Energies 13, no. 12 (2020): 3074. http://dx.doi.org/10.3390/en13123074.

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Conventional sparse spike deconvolution algorithms that are based on the iterative shrinkage-thresholding algorithm (ISTA) are widely used. The aim of this type of algorithm is to obtain accurate seismic wavelets. When this is not fulfilled, the processing stops being optimum. Using a recurrent neural network (RNN) as deep learning method and applying backpropagation to ISTA, we have developed an RNN-like ISTA as an alternative sparse spike deconvolution algorithm. The algorithm is tested with both synthetic and real seismic data. The algorithm first builds a training dataset from existing wel

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21

Ordaz, Mario, Mario A. Salgado-Gálvez, Luis E. Pérez-Rocha, Omar D. Cardona, and Ulises Mena-Hernández. "Optimum Earthquake Design Coefficients Based on Probabilistic Seismic Hazard Analyses: Theory and Applications." Earthquake Spectra 33, no. 4 (2017): 1455–74. http://dx.doi.org/10.1193/110116eqs189m.

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It is common practice to define the seismic design coefficients for earthquake-resistant building codes by choosing a fixed return period, leaving aside considerations about structural vulnerability and acceptable risk levels. This paper reviews the theory of the optimum design, introduced from almost the beginning of the formal probabilistic seismic hazard analysis framework and presents the results of its application in Mexico and Colombia using national seismic hazard models for the two countries. The obtained optimum design coefficients are compared with the ones obtained with the fixed re

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22

Kurbatsky, Evgeny N., and Vladimir L. Mondrus. "Dynamic Coefficients or Response Spectra of Structures to Earthquake?" Scientific journal “ACADEMIA. ARCHITECTURE AND CONSTRUCTION”, no. 1 (March 18, 2019): 107–14. http://dx.doi.org/10.22337/2077-9038-2019-1-107-114.

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There are big differences in definition of the seismic input in the norms of the Russian Federation code and in the foreign countries standards. Almost all normative documents and guidelines for the earthquake resistance analysis of structures in technically developed countries of the world used the concept of the response spectra concept. In the norms of the former USSR and the Russian Federation to assess the seismic effects used and continues to use the concept of "spectral coefficient of dynamism" - β. We believe that the concept is erroneous. The use of bad and erroneous terms can n

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23

Guo, Jin, and Jun Jie Wang. "An Efficient Calculation Method for Seismic Spectral Analysis under Multiple Support Excitations." Applied Mechanics and Materials 438-439 (October 2013): 1514–19. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1514.

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The seismic spectral computation of structures is time-consuming under multiple-support excitations. The seismic spectral response of structures can be expressed based on several correlation coefficients and the time consumption can be greatly reduced if the coefficients are expressed in closed-form. In this paper, approximate expressions of spatial coherence functions are suggested. Then integrals for the coefficients are carried out analytically and their closed-form expressions are obtained. The closed-form expressions are developed from Clough-Penziens APSD and Hus APSD. The numerical resu

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Kozlovskyy, E., D. Malytskyy, and A. Pavlova. "Determining and Analysis of Azimuthal Coefficients Qi for the Seismically Active Transcarpathians." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 1 (64) (2014): 30–35. http://dx.doi.org/10.17721/1728-2713.64.06.30-35.

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The aim of this paper is to clarify the velocity model of the Transcarpathian seismic region. The model will further be implemented in neural-network modelling to calculate and verify the depth and distribution of earthquake foci. There has been carried out an analysis of seismic wave propagation in different directions across the Transcarpathian seismic region. Being an important parameter indicative of the direction of wave propagation in a natural medium, the azimuthal coefficient q³ has proved to be efficient in developing a training neural network set. Two methods of selecting sectors hav

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25

Soubra, A. H. "Static and seismic passive earth pressure coefficients on rigid retaining structures." Canadian Geotechnical Journal 37, no. 2 (2000): 463–78. http://dx.doi.org/10.1139/t99-117.

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The passive earth pressure problem is investigated by means of the kinematical method of the limit analysis theory. A translational kinematically admissible failure mechanism composed of a sequence of rigid triangles is proposed. This mechanism allows the calculation of the passive earth pressure coefficients in both the static and seismic cases. Quasi-static representation of earthquake effects using the seismic coefficient concept is adopted. Rigorous upper-bound solutions are obtained in the framework of the limit analysis theory. The numerical results of the static and seismic passive eart

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Park, Duhee, Dong-Yeop Kwak, Chang-Gyun Jeong, and Taehyo Park. "Development of probabilistic seismic site coefficients of Korea." Soil Dynamics and Earthquake Engineering 43 (December 2012): 247–60. http://dx.doi.org/10.1016/j.soildyn.2012.07.018.

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Mu, Yong-Guang, and Si-Yuan Cao. "Seismic physical modeling and sandstone reservoir detection using absorption coefficients of seismic reflections." Journal of Petroleum Science and Engineering 41, no. 1-3 (2004): 159–67. http://dx.doi.org/10.1016/s0920-4105(03)00150-5.

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Jia, Hui Juan, Hang Dai, and Ruo Quan He. "Researches on the Structural Influencing Coefficient of Steel Frames under Different Sites Based on the Energy Concept." Applied Mechanics and Materials 226-228 (November 2012): 1000–1004. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1000.

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The structure influencing coefficients reflect discount rate on horizontal seismic action of different structure categories. In general, the structure influence coefficients are related with the ductility level and overstrength of the structure. According to Code for seismic design of buildings (GB50011-2008), four models of three story-steel frames are designed for 4 types of site. Dynamic time-history analysis is carried out to study the models with records of seismic waves. The ductility level, the over-strength and Structural Influencing Coefficient are derived by the energy concept in the

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Naghizadeh, Mostafa, and Mauricio Sacchi. "Ground-roll attenuation using curvelet downscaling." GEOPHYSICS 83, no. 3 (2018): V185—V195. http://dx.doi.org/10.1190/geo2017-0562.1.

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We have developed a ground-roll attenuation strategy for seismic records that adopts the curvelet transform. The curvelet transform decomposes the seismic events based on their dip and frequency content information. The curvelet panels that contain only either reflection or ground-roll energy can be used to alter the curvelet panels with mixed reflection and ground-roll energies. We build a curvelet-domain mask function from the ground-roll-free curvelet coefficients (high frequencies) and downscale it to the ground-roll-contaminated curvelet coefficients (low frequencies). The mask function i

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Xie, Kai Zhong, Le Qin Qin, and Wen Gao Lv. "A Method for Seismic Capacity Evaluation of CFST Arch Bridges." Advanced Materials Research 268-270 (July 2011): 377–82. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.377.

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Based on strength and ductility, the seismic capabilities of the chords of arch ribs, web members, horizontal integrations, suspenders and beams of suspenders of concrete filled steel tube (CFST) arch bridges are studied, then the seismic capability of the bridge is obtained. Firstly, the internal forces of the members are calculated respectively by finite element under the actions of gravity representative value and small earthquakes (0.05g). Then the ultimate bearing capacities, the ratio of ductility and the reduction coefficients of earthquake are obtained according to the failure modes. F

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Song, Zhiqiang, and Chenhui Su. "Computation of Rayleigh Damping Coefficients for the Seismic Analysis of a Hydro-Powerhouse." Shock and Vibration 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/2046345.

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The mass and stiffness of the upper and lower structures of a powerhouse are different. As such, the first two vibration modes mostly indicate the dynamic characteristics of the upper structure, and the precise seismic response of a powerhouse is difficult to obtain on the basis of Rayleigh damping coefficients acquired using the fundamental frequencies of this structure. The damping ratio of each mode is relatively accurate when the least square method is used, but the accuracy of the damping ratios that contribute substantially to seismic responses is hardly ensured. The error of dynamic res

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Yang, Jingkang, Jianhua Geng, and Luanxiao Zhao. "A frequency-decomposed nonstationary convolutional model for amplitude-versus-angle-and-frequency forward waveform modeling in attenuative media." GEOPHYSICS 85, no. 6 (2020): T301—T314. http://dx.doi.org/10.1190/geo2019-0338.1.

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The conventional convolutional model (CCM) is widely applied to generate synthetic seismic data for numerous applications including amplitude variation with offset forward modeling, seismic well tie, and inversion. This approach assumes frequency-independent reflection coefficients and time-invariant seismic wavelets in laterally homogeneous elastic media. We have extended CCM to heterogeneous poroelastic media in which reflection coefficients are frequency dependent and the seismic wave is attenuated as it propagates. First, we decompose the seismic wavelet into monofrequency components throu

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Byun, B. S., and D. Corrigan. "Seismic traveltime inversion for transverse isotropy." GEOPHYSICS 55, no. 2 (1990): 192–200. http://dx.doi.org/10.1190/1.1442826.

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Quantitative measurements of seismic anisotropy can provide a valuable clue to the lithology and degree of stratification in sedimentary rocks with hydrocarbon potential. We present a practical technique for obtaining anisotropy parameters (i.e., five stiffness coefficients A, C, F, L, and M) from seismic traveltime measurements for horizontally layered, transversely isotropic media. The technique is based on the construction of ray‐velocity surfaces in terms of five measurement parameters. An iterative model‐based optimization scheme is then used to invert the traveltime parameters for the fi

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Ren, Wenjing, Aijun Liu, and Dapeng Qiu. "Seismic Risk Analysis of Offshore Bridges Considering Seismic Correlation between Vulnerable Components." Applied Sciences 13, no. 11 (2023): 6485. http://dx.doi.org/10.3390/app13116485.

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To comprehensively evaluate the seismic performance of offshore bridges, a seismic risk analysis of an example bridge was developed based on improved two-dimensional (2D) seismic fragility analysis. Taking a simply-supported beam bridge in an offshore tidal environment as an example, the adverse effects of chloride ion erosion are considered and the seismic response process of the example bridge is simulated using the Incremental Dynamic Analysis (IDA) method. The appropriate damage indexes are chosen for the plate rubber bearing and the pier , and the one-dimensional (1D) seismic fragility cu

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Luo, Xiaodong, Tuhin Bhakta, Morten Jakobsen, and Geir Nævdal. "An Ensemble 4D-Seismic History-Matching Framework With Sparse Representation Based On Wavelet Multiresolution Analysis." SPE Journal 22, no. 03 (2016): 985–1010. http://dx.doi.org/10.2118/180025-pa.

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Summary In this work, we propose an ensemble 4D-seismic history-matching framework for reservoir characterization. Compared with similar existing frameworks in the reservoir-engineering community, the proposed one consists of some relatively new ingredients, in terms of the type of seismic data in choice, wavelet multiresolution analysis for the chosen seismic-data and related-data noise estimation, and the use of recently developed iterative ensemble history-matching algorithms. Typical seismic data used for history matching, such as acoustic impedance, are inverted quantities, whereas extra

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Fan, Xi, Liang Chen, Lei Lv, Jianye Zou, and Qiongli Zhou. "Research on the Evaluation Method for Key Buildings Based on Seismic Damage Index Modification—Taking the Yangzonghai Area Seismic Fortification Planning of Kunming City as an Example." Advances in Computer and Engineering Technology Research 1, no. 1 (2023): 124. http://dx.doi.org/10.61935/acetr.1.1.2023.p124.

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This article focuses on the evaluation of key buildings in seismic mitigation planning, based on the modified seismic damage index. In the evaluation process, a computational model for key building evaluation is proposed, including the coefficients for model modification. The weights of the model modification coefficients are quantitatively calculated, followed by the application of the model for evaluation and conclusion derivation. Taking the "Yangzonghai Regional Seismic Design Planning" as an example, in the key building evaluation section of the specific mitigation planning, the average s

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Nemtcov, V. S. "Comparison of methods of calculating the non-elastic absorption coefficients based on model seismic data." Moscow University Bulletin. Series 4. Geology, no. 4 (August 28, 2019): 63–69. http://dx.doi.org/10.33623/0579-9406-2019-4-63-69.

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The article is devoted to the assessment of the Q-factor of the medium using model seismic data. Investigations include the brief overview of seismic modeling software that allows modeling the wave field accounts Q-factor. The comparison of results obtained with Q-calculating algorithms and model seismic data with different signal to noise ratio gives a real estimate of the error in determining of Q-factor. This fact can be taken into account in the time processing of the real seismic data.

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Munadi, Suprajitno. "A COMPUTER PROGAM FOR COMPUTING SISMIC WAVE REFLECTION AND TRANSMISSION COEFFICIENTS OF A SINGLE INTERFACE." Scientific Contributions Oil and Gas 8, no. 2 (2022): 16–31. http://dx.doi.org/10.29017/scog.8.2.1161.

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Reflection and transmission properties of a single interface form the basic step in understanding and solving many problems of seismic waves propagation in multilayered media. The computational procedure of these coefficients is an essential element for numerical modeling or simulation purposes. A computer program for computing seismic wave reflection and transmission coefficients of a single interface has been effectively performed using the Gauss-Jordan elimination technique which is operated on a 4x 4 system of simultaneous linear equations with complex elements. The simultaneous equations

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Yang, Zhen, and Jun Lu. "Second-Order Approximation of the Seismic Reflection Coefficient in Thin Interbeds." Energies 13, no. 6 (2020): 1465. http://dx.doi.org/10.3390/en13061465.

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As most of the lithostratigraphic reservoirs in China are thin interbeds, the study of seismic responses in thin interbeds is an integral part of lithologic reservoir exploration. However, at present, the research on seismic reflection coefficients of thin interbeds in exploration seismology is still weak, which leads to the lack of theoretical basis for the subsequent interpretation of amplitude variation with offset (AVO) related to thin interbed. To solve this problem, in this paper, we proposed second-order approximate equations of the seismic reflection coefficients in thin-bed and thin-i

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Ye, Fangping, Hongquan Deng, Chaoyang Fang, Xiang Fu, and Zhe Li. "Damping coefficient calculation method for shore-side container cranes under the seismic conditions." Mechanics & Industry 24 (2023): 11. http://dx.doi.org/10.1051/meca/2023010.

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Shore-side container cranes (SCC) are widely used in ship loading and unloading. However, the SCC is often damaged by the seismic wave shock. In seismic response analysis, the setting of damping coefficients has a large impact on the accuracy of the calculation results. In order to better design the SCC mechanical performance, the improved damping coefficient calculation method is proposed. The results of the simulation and the experiment are compared under the different seismic conditions. The results show that the influence of the damping coefficient calculation method on the SCC seismic res

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Xie, Tao, Xiaodong Zheng, and Yan Zhang. "Seismic facies analysis based on speech recognition feature parameters." GEOPHYSICS 82, no. 3 (2017): O23—O35. http://dx.doi.org/10.1190/geo2016-0121.1.

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Seismic facies analysis plays an important role in seismic stratigraphy. Seismic attributes have been widely applied to seismic facies analysis. One of the most important steps is to optimize the most sensitive attributes with regard to reservoir characteristics. Using different attribute combinations in multidimensional analyses will yield different solutions. Acoustic waves and seismic waves propagating in an elastic medium follow the same law of physics. The generation process of a speech signal based on the acoustic model is similar to the seismic data of the convolution model. We have dev

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Uzdin, Aleksandr, Andrey Benin, Shohista Nazarova, Oyposhsha Sabirova, and Mihail Belashov. "Features of Construction Calculation on Frequent Weak Earthquake Impact." Proceedings of Petersburg Transport University 19, no. 2 (2022): 390–404. http://dx.doi.org/10.20295/1815-588x-2022-19-2-390-404.

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Purpose: To show the features of the calculation of constructions in opposition to the effect of weak frequent earthquakes. Methods: Numerical modeling of seismic vibrations of constructions. Analysis of limit states. Results: The specificities of construction calculation for impact of weak earthquakes are analyzed. Earthquakes of 1 per 30 and per 50 years repeatability are considered. In the first case, after an earthquake a construction should operate standardly, without damage. In the second case, damages, that does not affect construction exploitation, are accepted. Main attention is paid

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KORVIN, G. "THE KURTOSIS OF REFLECTION COEFFICIENTS IN A FRACTAL SEQUENCE OF SEDIMENTARY LAYERS." Fractals 01, no. 02 (1993): 263–68. http://dx.doi.org/10.1142/s0218348x93000277.

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In the reflection seismic technique of hydrocarbon prospecting, the measured signal is the convolution of an unknown sequence of reflection coefficients by a statistically known source signature. A basic task of seismic processing is to estimate the sequence of reflection coefficients. The aim of this paper is to show that in case of a fractal sedimentation model, the conventional statistical descriptors (variance, skewness, kurtosis) of the reflection coefficient sequence are strongly dependent on, or are even divergent functions of, the resolution.

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Kang, K., O. V. Zerkal, J. Liu, S. Huang, and D. Tao. "Comparison of Russian, Chinese and European seismic design on pseudo-static seismic coefficient in slope analysis." Journal of Civil Engineering and Construction 7, no. 2 (2018): 57. http://dx.doi.org/10.32732/jcec.2018.7.2.57.

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Most design codes and specifications recommend a simple pseudo-static approach for the analysis of slope stability under seismic conditions. The codes in different countries appoint different pseudo-static seismic coefficient. The present work list different seismic coefficients in Russian, Chinese and European codes. A sensitivity analysis of a case slope was carried out using GeoStudio, then determined that the stability of the slope is more sensitive to material cohesion and seismic coefficient than material density and friction angle. It’s shown that the chosen of the seismic coefficient h

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Denelle, E. "TO TACKLE THE DECONVOLUTION PROBLEM — A POWERFUL METHOD BASED ON MORE GEOLOGICAL HYPOTHESES." APPEA Journal 26, no. 1 (1986): 192. http://dx.doi.org/10.1071/aj85019.

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The new rules of the game in hydrocarbon exploration demand an exact positioning of the seismic markers in order to define the geometry of the targets more than ever before. However, the degree of success will depend to a great extent on how accurately the amplitude of reflection coefficients can be estimated.These new requirements mean that all stages of traditional seismic processing have to be critically evaluated. It can be seen, in particular, when assessing existing deconvolution methods for seismic processing, that they are often ill-conditioned to problems posed by the targets of strat

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Wright, J. "Reflection coefficients at pore‐fluid contacts as a function of offset." GEOPHYSICS 51, no. 9 (1986): 1858–60. http://dx.doi.org/10.1190/1.1442232.

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It has been recognized for some time that seismic amplitude variations with offset contain lithologic and pore‐fluid information. However, the exact formulas for plane‐wave reflection coefficients are not easily interpreted in terms of the effects expected from classes of geologic models. For fluid contacts within a rock unit (which may show up as “flat spots” in seismic data), simplified approximate formulas can be derived to predict reflection coefficients for compressional (P) and shear (S) waves. The formulas derived in this note predict (under the assumption that changes in pore fluid do

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Nazarian, Soheil, Deren Yuan, Eric Weissinger, and Mark McDaniel. "Comprehensive Quality Control of Portland Cement Concrete With Seismic Methods." Transportation Research Record: Journal of the Transportation Research Board 1575, no. 1 (1997): 102–11. http://dx.doi.org/10.3141/1575-14.

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The feasibility of seismic methods for determining the quality and thickness of portland cement concrete layers was recently studied. The study consisted of performing nondestructive laboratory seismic tests on cylinders that were laboratory-cured for 2 to 90 days. The cylinders were then subjected to appropriate strength tests (such as compressive and splitting tensile). Reasonably high correlations were found between static modulus, compressive strength, or tensile strength and seismic modulus. Seismic moduli were also found to be repeatable, as the coefficients of variation for different lo

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Xue, Ya-Juan, Jun-Xing Cao, Xing-Jian Wang, and Hao-Kun Du. "Estimation of seismic quality factor in the time-frequency domain using variational mode decomposition." GEOPHYSICS 85, no. 4 (2020): V329—V343. http://dx.doi.org/10.1190/geo2019-0404.1.

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Seismic attenuation as represented by the seismic quality factor [Formula: see text] has a substantial impact on seismic reflection data. To effectively eliminate the interference of reflection coefficients for [Formula: see text] estimation, a new method is proposed based on the stationary convolutional model of a seismic trace using variational mode decomposition (VMD). VMD is conducted on the logarithmic spectra extracted from the time-frequency distribution of the seismic reflection data generated from the generalized S transform. For the intrinsic mode functions after VMD, mutual informat

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Zhang, Tingting, and Daniel Dias. "An Efficient Solution for Probabilistic Slope Seismic Stability Analysis Based on Polynomial Chao Kriging Metamodel." GeoHazards 5, no. 2 (2024): 530–46. http://dx.doi.org/10.3390/geohazards5020027.

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Slope stability analysis plays a crucial role in geotechnical engineering, particularly in regions susceptible to seismic activity. The inherent non-homogeneity and uncertainty of soil properties pose significant challenges in assessing slope stability under seismic conditions. To address these complexities, a novel and efficient methodology named DUBLA-PDM-PCK is proposed. In this methodology, the effects of soil non-homogeneity and uncertainty, along with the time and spatial variations of seismic loading, are systematically considered. The deterministic framework integrates discretized uppe

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Erik Rabben, Tor, Håkon Tjelmeland, and Bjørn Ursin. "Non-linear Bayesian joint inversion of seismic reflection coefficients." Geophysical Journal International 173, no. 1 (2008): 265–80. http://dx.doi.org/10.1111/j.1365-246x.2007.03710.x.

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