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Journal articles on the topic 'Global tomography,surface waves,wavelets'

Author: Grafiati

Published: 10 March 2023

Last updated: 19 July 2025

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1

Syaifuddin, Firman, Andri Dian Nugraha, Zulfakriza, and Shindy Rosalia. "Synthetic Modeling of Ambient Seismic Noise Tomography Data." IOP Conference Series: Earth and Environmental Science 873, no. 1 (2021): 012096. http://dx.doi.org/10.1088/1755-1315/873/1/012096.

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Abstract Ambient seismic noise tomography is one of the most widely used methods in seismological studies today, especially after a comprehensive Earth noise model was published and noise analysis was performed on the IRIS Global Seismographic Network. Furthermore, the Power Spectral Density technique was introduced to identify background seismic noise in the United States. Many studies have been carried out using the ambient seismic noise tomography method which can be broadly grouped into several groups based on the objectives and research targets, such as to determine the structure of the e

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Yuan, Yanhua O., and Frederik J. Simons. "Multiscale adjoint waveform-difference tomography using wavelets." GEOPHYSICS 79, no. 3 (2014): WA79—WA95. http://dx.doi.org/10.1190/geo2013-0383.1.

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Full-waveform seismic inversions based on minimizing the distance between observed and predicted seismograms are, in principle, able to yield better-resolved earth models than those minimizing misfits derived from traveltimes alone. Adjoint-based methods provide an efficient way of calculating the gradient of the misfit function via a sequence of forward-modeling steps, which, using spectral-element codes, can be carried out in realistically complex media. Convergence and stability of full-waveform-difference adjoint schemes are greatly improved when data and synthetics are progressively prese

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Peter, D., C. Tape, L. Boschi, and J. H. Woodhouse. "Surface wave tomography: global membrane waves and adjoint methods." Geophysical Journal International 171, no. 3 (2007): 1098–117. http://dx.doi.org/10.1111/j.1365-246x.2007.03554.x.

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Pan, Wenyong, Zhui Chen, Hong Cao, et al. "Elastic FWI of land W-VSP data: A case study in the Sichuan Basin of China." Leading Edge 44, no. 5 (2025): 414a1–414a7. https://doi.org/10.1190/tle44050414a1.1.

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Elastic full-waveform inversion (FWI) methods are expected to construct high-resolution subsurface elastic properties, which are of great importance for accurately characterizing and delineating hydrocarbon reservoirs. However, elastic FWI for land seismic data is challenging due to low signal-to-noise ratio data, complex near-surface environments, unknown source parameters, etc. In this study, elastic FWI is applied to multicomponent land walkaway vertical seismic profile data acquired in the Sichuan Basin of Southwest Oil and Gas Field in China. A series of methods and strategies are used to

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Dufumier, Hugues, and Jeannot Trampert. "Contribution of seismic tomography in moment-tensor inversions using teleseismic surface-wave spectra." Bulletin of the Seismological Society of America 87, no. 1 (1997): 114–22. http://dx.doi.org/10.1785/bssa0870010114.

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Abstract The knowledge of lateral heterogeneities is crucial for path corrections in moment tensor inversions using surface waves. After some attempts to use regionalized Earth models for very long-period surface-wave moment-tensor inversions, recent tomographic Earth models offer the possibility to make short-period path corrections and therefore retrieve more reliable moment tensors for teleseismic earthquakes. First we try to evaluate the precision required for path corrections in comparison with source effects. Some selected Earth models are tested to evaluate how their results compare to

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deSilva, Susini, and Vernon F. Cormier. "The relative contributions of scattering and viscoelasticity to the attenuation of S waves in Earth's mantle." Solid Earth 11, no. 1 (2020): 161–71. http://dx.doi.org/10.5194/se-11-161-2020.

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Abstract. The relative contributions of scattering and viscoelastic attenuation to the apparent attenuation of seismic body waves are estimated from synthetic and observed S waves multiply reflected from Earth's surface and the core–mantle boundary. The synthetic seismograms include the effects of viscoelasticity and scattering from small-scale heterogeneity predicted from both global tomography and from thermodynamic models of mantle heterogeneity that have been verified from amplitude coherence measurements of body waves observed at dense arrays. Assuming thermodynamic models provide an esti

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Gualtieri, Lucia, Etienne Bachmann, Frederik J. Simons, and Jeroen Tromp. "The origin of secondary microseism Love waves." Proceedings of the National Academy of Sciences 117, no. 47 (2020): 29504–11. http://dx.doi.org/10.1073/pnas.2013806117.

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The interaction of ocean surface waves produces pressure fluctuations at the seafloor capable of generating seismic waves in the solid Earth. The accepted mechanism satisfactorily explains secondary microseisms of the Rayleigh type, but it does not justify the presence of transversely polarized Love waves, nevertheless widely observed. An explanation for two-thirds of the worldwide ambient wave field has been wanting for over a century. Using numerical simulations of global-scale seismic wave propagation at unprecedented high frequency, here we explain the origin of secondary microseism Love w

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Yordkayhun, Sawasdee. "Geophysical Characterization of a Sinkhole Region: A Study toward Understanding Geohazards in the Karst Geosites." Sains Malaysiana 50, no. 7 (2021): 1871–84. http://dx.doi.org/10.17576/jsm-2021-5007-04.

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The outstanding geosites in Satun UNESCO Global Geopark, Thailand are mainly karst topography. Sinkhole which is originated from the dissolution of karst rocks by groundwater or acidic rainwater is one of the potential natural disasters in these geosites. To gain the confident among geotourism, detecting karst features, cavities and surficial dissolution is crucial in risk assessment and sustainable geopark management. As a part of geohazard assessment, non-invasive geophysical methods were applied for detecting near-surface defects and karst features. In this study, electrical resistivity tom

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Zahmatkesh, Homayoon, and Abbas Abedeni. "Non-Parametric Wavelet Functional Analysis for Horizontal and Vertical displacements Derived from GPS Stations in Western Alaska during the Year 2012." Earth Science Research 6, no. 2 (2017): 112. http://dx.doi.org/10.5539/esr.v6n2p112.

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In order to analyze the dynamic processes of the Earth interior and the effect of the propagation of the seismic waves to the surface, a comprehensive study of the Earth crust kinematics is necessary. Although the Global Positing System (GPS) is a powerful method to measure ground displacements and velocities both horizontally and vertically as well as to infer the tectonic stress regime generated by the subsurface processes (from local fault systems to huge tectonic plate movements and active volcanoes), the complexity of the deformation pattern generated during such movements is not always e

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Porritt, Robert W., Thorsten W. Becker, Lapo Boschi, and Ludwig Auer. "Multiscale, radially anisotropic shear wave imaging of the mantle underneath the contiguous United States through joint inversion of USArray and global data sets." Geophysical Journal International 226, no. 3 (2021): 1730–46. http://dx.doi.org/10.1093/gji/ggab185.

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SUMMARY EarthScope's USArray seismic component provided unprecedented coverage of the contiguous United States and has therefore spurred significant advances in tomographic imaging and geodynamic modelling. Here, we present a new global, radially anisotropic shear wave velocity tomography model to investigate upper mantle structure and North American Plate dynamics, with a focus on the contiguous United States. The model uses a data-adaptive mesh and traveltimes of both surface waves and body waves to constrain structure in the crust and mantle in order to arrive at a more consistent represent

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Simmons, N. A., S. C. Myers, C. Morency, A. Chiang, and D. R. Knapp. "SPiRaL: a multiresolution global tomography model of seismic wave speeds and radial anisotropy variations in the crust and mantle." Geophysical Journal International 227, no. 2 (2021): 1366–91. http://dx.doi.org/10.1093/gji/ggab277.

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SUMMARY SPiRaL is a joint global-scale model of wave speeds (P and S) and anisotropy (vertical transverse isotropy, VTI) variations in the crust and mantle. The model is comprised of &gt;2.1 million nodes with five parameters at each node that capture velocity variations for P- and S-waves travelling at arbitrary directions in transversely isotropic media with a vertical symmetry axis (VTI). The crust (including ice, water, sediments and crystalline layers) is directly incorporated into the model. The default node spacing is approximately 2° in the lower mantle and 1° in the crust and uppe

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Romanowicz, Barbara, Li-Wei Chen, and Scott W. French. "Accelerating full waveform inversion via source stacking and cross-correlations." Geophysical Journal International 220, no. 1 (2019): 308–22. http://dx.doi.org/10.1093/gji/ggz437.

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SUMMARY Accurate synthetic seismic wavefields can now be computed in 3-D earth models using the spectral element method (SEM), which helps improve resolution in full waveform global tomography. However, computational costs are still a challenge. These costs can be reduced by implementing a source stacking method, in which multiple earthquake sources are simultaneously triggered in only one teleseismic SEM simulation. One drawback of this approach is the perceived loss of resolution at depth, in particular because high-amplitude fundamental mode surface waves dominate the summed waveforms, with

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Pipatprathanporn, Sirawich, and Frederik J. Simons. "One year of sound recorded by a mermaid float in the Pacific: hydroacoustic earthquake signals and infrasonic ambient noise." Geophysical Journal International 228, no. 1 (2021): 193–212. http://dx.doi.org/10.1093/gji/ggab296.

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SUMMARY A fleet of autonomously drifting profiling floats equipped with hydrophones, known by their acronym mermaid, monitors worldwide seismic activity from inside the oceans. The instruments are programmed to detect and transmit acoustic pressure conversions from teleseismic P wave arrivals for use in mantle tomography. Reporting seismograms in near-real time, within hours or days after they were recorded, the instruments are not usually recovered, but if and when they are, their memory buffers can be read out. We present a unique 1-yr-long data set of sound recorded at frequencies between 0

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Guo, Zhen, and Ying Zhou. "Finite-frequency imaging of the global 410- and 660-km discontinuities using SS precursors." Geophysical Journal International 220, no. 3 (2019): 1978–94. http://dx.doi.org/10.1093/gji/ggz546.

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SUMMARY We report finite-frequency imaging of the global 410- and 660-km discontinuities using boundary sensitivity kernels for traveltime measurements made on SS precursors. The application of finite-frequency sensitivity kernels overcomes resolution limits in previous studies associated with large Fresnel zones of SS precursors and their interferences with other seismic phases. In this study, we calculate the finite-frequency sensitivities of SS waves and their precursors based on a single-scattering (Born) approximation in the framework of travelling-wave mode summation. The global disconti

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Liu, Yiduo, Lun Li, Jolante van Wijk, Aibing Li, and Yuanyuan V. Fu. "Surface-wave tomography of the Emeishan large igneous province (China): Magma storage system, hidden hotspot track, and its impact on the Capitanian mass extinction." Geology 49, no. 9 (2021): 1032–37. http://dx.doi.org/10.1130/g49055.1.

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Abstract Large igneous provinces (LIPs) are commonly associated with mass extinctions. However, the precise relations between LIPs and their impacts on biodiversity is enigmatic, given that they can be asynchronous. It has been proposed that the environmental impacts are primarily related to sill emplacement. Therefore, the structure of LIPs' magma storage system is critical because it dictates the occurrence and timing of mass extinction. We use surface-wave tomography to image the lithosphere under the Permian Emeishan large igneous province (ELIP) in southwestern China. We find a northeast-

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Weidner, Erik, Caroline Beghein, Quancheng Huang, and Nicholas Schmerr. "Upper mantle radial anisotropy under the Indian Ocean from higher mode surface waves and a hierarchical transdismensional approach." Geophysical Journal International 228, no. 1 (2021): 78–101. http://dx.doi.org/10.1093/gji/ggab340.

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SUMMARY We investigated the likelihood of radial anisotropy in the shallow and deep upper mantle, including the mantle transition zone (MTZ) under the Indian Ocean. Seismic anisotropy can be an indicator of mantle deformation through lattice preferred orientation of anisotropic crystals in the mantle. It has thus the potential to illuminate Earth’s dynamic interior, but previous seismic tomography studies have not achieved consensus on the existence of radial anisotropy below ∼250 km depth. We developed a fully nonlinear transdimensional hierarchical Bayesian Markov Chain Monte Carlo approach

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17

Gimbert, Florent, Ugo Nanni, Philippe Roux, et al. "A Multi-Physics Experiment with a Temporary Dense Seismic Array on the Argentière Glacier, French Alps: The RESOLVE Project." Seismological Research Letters 92, no. 2A (2021): 1185–201. http://dx.doi.org/10.1785/0220200280.

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Abstract Recent work in the field of cryo-seismology demonstrates that high-frequency (&gt;1 Hz) seismic waves provide key constraints on a wide range of glacier processes, such as basal friction, surface crevassing, or subglacial water flow. Establishing quantitative links between the seismic signal and the processes of interest, however, requires detailed characterization of the wavefield, which, at high frequencies, necessitates the deployment of large and dense seismic arrays. Although dense seismic array monitoring has recently become increasingly common in geophysics, its application

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Celli, N. L., S. Lebedev, A. J. Schaeffer, M. Ravenna, and C. Gaina. "The upper mantle beneath the South Atlantic Ocean, South America and Africa from waveform tomography with massive data sets." Geophysical Journal International 221, no. 1 (2020): 178–204. http://dx.doi.org/10.1093/gji/ggz574.

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SUMMARY We present a tomographic model of the crust, upper mantle and transition zone beneath the South Atlantic, South America and Africa. Taking advantage of the recent growth in broadband data sampling, we compute the model using waveform fits of over 1.2 million vertical-component seismograms, obtained with the automated multimode inversion of surface, S and multiple S waves. Each waveform provides a set of linear equations constraining perturbations with respect to a 3-D reference model within an approximate sensitivity volume. We then combine all equations into a large linear system and

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Tronicke, Jens, and Göran Hamann. "Vertical radar profiling: Combined analysis of traveltimes, amplitudes, and reflections." GEOPHYSICS 79, no. 4 (2014): H23—H35. http://dx.doi.org/10.1190/geo2013-0428.1.

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Vertical radar profiling (VRP) is a single-borehole geophysical technique, in which the receiver antenna is located within a borehole and the transmitter antenna is placed at one or various offsets from the borehole. Today, VRP surveying is primarily used to derive 1D velocity models by inverting the arrival times of direct waves. Using field data collected at a well-constrained test site in Germany, we evaluated a VRP workflow relying on the analysis of direct-arrival traveltimes and amplitudes as well as on imaging reflection events. To invert our VRP traveltime data, we used a global invers

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20

Wilcock, William S. D., Spahr C. Webb, and Ingi Th Bjarnason. "The effect of local wind on seismic noise near 1 Hz at the MELT site and in iceland." Bulletin of the Seismological Society of America 89, no. 6 (1999): 1543–57. http://dx.doi.org/10.1785/bssa0890061543.

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Abstract The mantle electromagnetic and tomography (MELT) experiment on the east Pacific rise near 17°S was the first large teleseismic experiment on a midocean ridge. During the six-month deployment, no compressional arrivals were well recorded above 0.5 Hz. In comparison, the ICEMELT experiment in Iceland recorded compressional arrivals at 1-2 Hz from about 2 earthquakes per month. We compare noise spectra from the two experiments and show that this difference in detection is at least in part a result of noise. Near 1 Hz, seismic noise in the oceans is produced locally by wind-generated wave

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Ringler, Adam T., Robert E. Anthony, Colleen A. Dalton, and David C. Wilson. "Rayleigh-Wave Amplitude Uncertainty across the Global Seismographic Network and Potential Implications for Global Tomography." Bulletin of the Seismological Society of America, March 30, 2021. http://dx.doi.org/10.1785/0120200255.

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ABSTRACT The Global Seismographic Network (GSN) is a multiuse, globally distributed seismic network used by seismologists, to both characterize earthquakes and study the Earth’s interior. Most stations in the network have two collocated broadband seismometers, which enable network operators to identify potential metadata and sensor issues. In this study, we investigate the accuracy with which surface waves can be measured across the GSN, by comparing waveforms of vertical-component Rayleigh waves from Mw 6 and larger events between collocated sensor pairs. We calculate both the amplitude devia

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Doody, Claire, Arthur Rodgers, Michael Afanasiev, et al. "CANVAS: An Adjoint Waveform Tomography Model of California and Nevada." Journal of Geophysical Research: Solid Earth 128, no. 12 (2023). http://dx.doi.org/10.1029/2023jb027583.

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AbstractWe present the California‐Nevada Adjoint Simulations (CANVAS) model, an adjoint waveform tomography model of the crust and uppermost mantle of the states of California and Nevada. We used WUS256 (Rodgers et al., 2022, https://doi.org/10.1029/2022jb024549) as the starting model and iteratively decreased the minimum period of CANVAS from 30 to 12 s. CANVAS was iterated in two distinct stages: the first stage with source mechanisms from the Global Centroid Moment Tensor (GCMT) catalog and the second stage with inverted moment tensors (MT) using the CANV_WUS model (Doody et al., 2023, http

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Simon, Joel D., Frederik J. Simons, and Jessica C. E. Irving. "A MERMAID Miscellany: Seismoacoustic Signals beyond the P Wave." Seismological Research Letters, June 30, 2021. http://dx.doi.org/10.1785/0220210052.

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Abstract Mobile Earthquake Recorder in Marine Areas by Independent Divers (MERMAID) is a passively drifting oceanic diving float that transmits acoustic pressure records from global earthquakes within hours or days of their rupture. The onboard algorithm used for the detection and identification of signals from the hydrophone prioritizes the recovery of ∼1 Hz teleseismic P waves, which are useful for seismic imaging of Earth’s mantle. Two years into a mission that launched 50 MERMAIDs to map 3D mantle wavespeed anomalies with high resolution under the Pacific in French Polynesia, it is clear t

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Chua, Ee Liang, and Sergei Lebedev. "Waveform tomography of the Antarctic Plate." Geophysical Journal International, January 29, 2025. https://doi.org/10.1093/gji/ggaf041.

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Summary We present a new seismic shear wave velocity model of the upper mantle of the Antarctic Plate region, AP2024. It includes the lithosphere and underlying mantle down to 660 km depth beneath both the continental and oceanic portions of the plate. To augment the limited seismic station coverage of Antarctica, we assemble very large regional and global data sets, comprising all publicly available broadband seismic data. The model is built using 785 thousand seismograms from over 27 thousand events and 8.7 thousand stations. It is constrained by both body and Rayleigh surface waves, ensurin

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Magrini, Fabrizio, Sebastian Lauro, Emanuel Kästle, and Lapo Boschi. "Surface-wave tomography using SeisLib: a Python package for multi-scale seismic imaging." Geophysical Journal International, June 22, 2022. http://dx.doi.org/10.1093/gji/ggac236.

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Summary To improve our understanding of the Earth’s interior, seismologists often have to deal with enormous amounts of data, requiring automatic tools for their analyses. It is the purpose of this study to present SeisLib, an open-source Python package for multi-scale seismic imaging. At present, SeisLib includes routines for carrying out surface-wave tomography tasks based on seismic ambient noise and teleseismic earthquakes. We illustrate here these functionalities, both from the theoretical and algorithmic point of view and by application of our library to seismic data from North America.

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Niklasson, Siobhan, Charlotte Rowe, and Susan Bilek. "Seafloor Seismic Noise Patterns Across the Pacific Basin." Seismological Research Letters, February 19, 2025. https://doi.org/10.1785/0220240361.

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Abstract Seismic hazard monitoring and global tomography efforts are improved by recording signals at a variety of distances and azimuths to maximize subsurface sampling. Although seismic networks provide good to excellent coverage on land, seafloor stations are still sparse. Inclusion of ocean-based data would greatly improve the global coverage of seismic networks, but the use of seafloor seismic data to complement land-based detection and characterization of events is complicated by the generally much higher ambient noise level in the ocean compared to that observed on land. This noise is d

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Restelli, F., P. Koelemeijer, and A. M. G. Ferreira. "Normal mode observability of radial anisotropy in the Earth’s mantle." Geophysical Journal International, December 1, 2022. http://dx.doi.org/10.1093/gji/ggac474.

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Summary Observations of seismic anisotropy provide useful information to infer directions of mantle flow. However, existing global anisotropic tomography models are not consistent, particularly in the lower mantle. Therefore, the interpretation of seismic anisotropy in terms of mantle dynamics and evolution remains difficult. While surface and body waves are commonly used to build radially anisotropic tomography models, they provide heterogeneous data coverage and the radial anisotropy structure retrieved using these data may be biased by the use of imperfect crustal corrections. Normal modes,

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Dalętka, Andrzej Michał. "Selected aspects of modern seismic imaging and near-surface velocity model building in the area of Carpathian fold and thrust belt." Geology, Geophysics and Environment 47, no. 2 (2021). http://dx.doi.org/10.7494/geol.2021.47.2.71.

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Despite the increasing technological level of the reflection seismic method, the imaging of fold and thrust belts remains a demanding task, and usually leaves some questions regarding the dips, the shape of the subthrust structures or the most correct approach to velocity model building. There is no straightforward method that can provide structural representation of the near-surface geological boundaries and their velocities. The in-terpretation of refracted waves frequently remains the only available technique that may be used for this purpose, although one must be aware of its limitations w

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Richardson, David K., Jackson C. McCormick, and Morris B. Cohen. "A D‐Region Ionospheric Imaging Method using Sferic‐Based Tomography." Journal of Geophysical Research: Space Physics, August 9, 2023. http://dx.doi.org/10.1029/2023ja031573.

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AbstractWe present a tomographic imaging technique for the D‐region electron density using a set of spatially distributed very low frequency (VLF) remote sensing measurements. The D‐region ionosphere plays a critical role in many long‐range and over‐the‐horizon communication systems; however, it is unreachable by most direct measurement techniques such as balloons and satellites. Fortunately, the D region, combined with Earth’s surface, forms what is known as the Earth‐Ionosphere waveguide (EIWG) allowing VLF and low frequency (LF) radio waves to propagate to global distances. By measuring the

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Wang, Li-Song, Benjamin Krull, Dirk Lucas, et al. "Simulation of droplet entrainment in annular flow with a morphology adaptive multifield two-fluid model." Physics of Fluids 35, no. 10 (2023). http://dx.doi.org/10.1063/5.0169288.

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Modeling of annular flow with the computational fluid dynamics (CFD) is challenging as one has to consider several, rather different, phenomena simultaneously: the continuous liquid film, continuous gas core, and dispersed droplets. A morphology-adaptive multifield two-fluid model (MultiMorph) developed by Meller et al. [“Basic verification of a numerical framework applied to a morphology adaptive multifield two-fluid model considering bubble motions,” Int. J. Numer. Methods Fluids 93(3), 748–773 (2021)], with three numerical phase fields, is well suited to simulate such multiple flow structur

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