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Journal articles on the topic 'Wave imaging'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Lee, Tae-Hun, and Dong-Ryul Kwak. "Phased Array Ultrasonic Imaging using Plane Wave Imaging Technique." JOURNAL OF THE KOREAN SOCIETY FOR NONDESTRUCTIVE TESTING 39, no. 6 (2019): 342–50. http://dx.doi.org/10.7779/jksnt.2019.39.6.342.

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2

Liu, Zhi-Ying, Ping Zhang, Bi-Xing Zhang, and Wen Wang. "Multi Spherical Wave Imaging Method Based on Ultrasonic Array." Sensors 22, no. 18 (2022): 6800. http://dx.doi.org/10.3390/s22186800.

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The imaging range of traditional plane wave imaging is usually limited by the directivity of the plane wave. In this paper, a multi spherical wave imaging method based on an ultrasonic array is proposed, which radiates both compression and shear waves in a solid medium to form the multi spherical wave. Firstly, excitation characteristics of the multi spherical wave are analyzed theoretically and the calculation method of echo delay of multi spherical wave imaging is derived. Multi spherical wave imaging is compared with conventional ultrasonic plane wave imaging by designing experiments. Compa

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3

Tang, Xiao-Ming, and Douglas J. Patterson. "Single-well S-wave imaging using multicomponent dipole acoustic-log data." GEOPHYSICS 74, no. 6 (2009): WCA211—WCA223. http://dx.doi.org/10.1190/1.3227150.

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Single-well S-wave imaging has several attractive features because of its directional sensitivity and usefulness for fracture characterization. To provide a method for single-well acoustic imaging, we analyzed the effects of wave radiation, reflection, and borehole acoustic response on S-wave reflection measurements from a multicomponent dipole acoustic tool. A study of S-wave radiation from a dipole source and the wave’s reflection from a formation boundary shows that the S-waves generated by a dipole source in a borehole have a wide radiation pattern that allows imaging of reflectors at vari

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Steiner, Brian, Erik H. Saenger, and Stefan M. Schmalholz. "Time-reverse imaging with limited S-wave velocity model information." GEOPHYSICS 76, no. 5 (2011): MA33—MA40. http://dx.doi.org/10.1190/geo2010-0303.1.

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Time-reverse imaging is a wave propagation algorithm for locating sources. Signals recorded by synchronized receivers are reversed in time and propagated back to the source location by elastic wavefield extrapolation. Elastic wavefield extrapolation requires a P-wave as well as an S-wave velocity model. The velocity models available from standard reflection seismic methods are usually restricted to only P-waves. In this study, we use synthetically produced time signals to investigate the accuracy of seismic source localization by means of time-reverse imaging with the correct P-wave and a pert

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5

Rajput, Sanjeev, and Michael Ring. "Examining the processing differences between P and P-S waves in a Rocky Mountain Foothills model." APPEA Journal 54, no. 2 (2014): 504. http://dx.doi.org/10.1071/aj13077.

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For the past two decades, most of the shear-wave (S-wave) or converted wave (P-S) acquisitions were performed with P-wave source by making the use of downgoing P-waves converting to upgoing S-waves at the mode conversion boundaries. The processing of converted waves requires studying asymmetric reflection at the conversion point, difference in geometries and conditions of source and receiver, and the partitioning of energy into orthogonally polarised components. Interpretation of P-S sections incorporates the identification of P-S waves, full waveform modeling, correlation with P-wave sections

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Rajput, Sanjeev, and Michael Ring. "Examining the processing differences between P and P-S waves in a Rocky Mountain Foothills model." APPEA Journal 54, no. 2 (2014): 536. http://dx.doi.org/10.1071/aj13109.

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For the past two decades, most of the shear-wave (S-wave) or converted wave (P-S) acquisitions were performed with P-wave source by making the use of downgoing P-waves converting to upgoing S-waves at the mode conversion boundaries. The processing of converted waves requires studying asymmetric reflection at the conversion point, difference in geometries and conditions of source and receiver, and the partitioning of energy into orthogonally polarised components. Interpretation of P-S sections incorporates the identification of P-S waves, full waveform modeling, correlation with P-wave sections

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Zhang, Xinan. "Passive millimeter wave imaging low altitude detection technology." Applied and Computational Engineering 62, no. 1 (2024): 211–17. http://dx.doi.org/10.54254/2755-2721/62/20240429.

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Passive millimeter wave imaging refers to the passive detection of naturally occurring background millimeter waves. After receiving external millimeter wave thermal radiation signals, the passive millimeter wave detection system will form images based on temperature differences and detect targets. Passive millimeter wave imaging has the advantages of non-radiation, non-contact, perspective imaging, good concealment, small size, and low power consumption. It is widely used in safety inspections, aircraft landing, low visibility navigation, sea surface detection and other fields. Driven by high

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8

Fan, Liexiang. "SHEAR WAVE IMAGING." Journal of the Acoustical Society of America 132, no. 6 (2012): 4100. http://dx.doi.org/10.1121/1.4770456.

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9

Luther, Stefan. "Electromechanical Wave Imaging." JACC: Clinical Electrophysiology 11, no. 4 (2025): 682–84. https://doi.org/10.1016/j.jacep.2025.02.043.

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10

BAL, GUILLAUME, and OLIVIER PINAUD. "IMAGING USING TRANSPORT MODELS FOR WAVE–WAVE CORRELATIONS." Mathematical Models and Methods in Applied Sciences 21, no. 05 (2011): 1071–93. http://dx.doi.org/10.1142/s0218202511005258.

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We consider the imaging of objects buried in unknown heterogeneous media. The medium is probed by using classical (e.g. acoustic or electromagnetic) waves. When heterogeneities in the medium become too strong, inversion methodologies based on a microscopic description of wave propagation (e.g. a wave equation or Maxwell's equations) become strongly dependent on the unknown details of the heterogeneous medium. In some situations, it is preferable to use a macroscopic model for a quantity that is quadratic in the wave fields. Here, such macroscopic models take the form of radiative transfer equa

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11

Choi, Yun-Shil, Hyomi Jeong, and Jung-Ryul Lee. "Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant." Shock and Vibration 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/296426.

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In this paper, we propose a J-groove dissimilar weld crack visualization system based on ultrasonic propagation imaging (UPI) technology. A full-scale control rod drive mechanism (CRDM) assembly specimen was fabricated to verify the proposed system. An ultrasonic sensor was contacted at one point of the inner surface of the reactor vessel head part of the CRDM assembly. Q-switched laser beams were scanned to generate ultrasonic waves around the weld bead. The localization and sizing of the crack were possible by ultrasonic wave propagation imaging. Furthermore, ultrasonic spectral imaging unve

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12

Engelmark, F. L. "MULTI-COMPONENT SEISMIC—THE TOOL FOR ALL REASONS." APPEA Journal 42, no. 1 (2002): 587. http://dx.doi.org/10.1071/aj01034.

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Marine multi-component seismic, known as 4C, is an emerging seismic technology providing improved and sometimes unique solutions to many common problems. In the marine environment the seismic sensors have to be placed on the sea-floor to capture converted or shear wave modes that cannot propagate through liquid media. Although this means increased acquisition cost, the improved information content makes it money well spent to better image and characterise reservoirs.The 4C solutions fall into two major groups of five. First there are the imaging solutions:Improved standard P-wave imaging. Impr

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13

Youn, Oong K., and Hua‐wei Zhou. "Depth imaging with multiples." GEOPHYSICS 66, no. 1 (2001): 246–55. http://dx.doi.org/10.1190/1.1444901.

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Depth imaging with multiples is a prestack depth migration method that uses multiples as the signal for more accurate boundary mapping and amplitude recovery. The idea is partially related to model‐based multiple‐suppression techniques and reverse‐time depth migration. Conventional reverse‐time migration uses the two‐way wave equation for the backward wave propagation of recorded seismic traces and ray tracing or the eikonal equation for the forward traveltime computation (the excitation‐time imaging principle). Consequently, reverse‐time migration differs little from most other one‐way wave e

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14

Peng, Daicheng, Fei Cheng, Hao Xu, and Yuquan Zong. "An Application of 3D Cross-Well Elastic Reverse Time Migration Imaging Based on the Multi-Wave and Multi-Component Technique in Coastal Engineering Exploration." Journal of Marine Science and Engineering 12, no. 3 (2024): 522. http://dx.doi.org/10.3390/jmse12030522.

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Precise surveys are indispensable in coastal engineering projects. The extensive presence of sand in the coastal area leads to significant attenuation of seismic waves within unsaturated loose sediments. As a result, it becomes challenging for seismic waves to penetrate the weathered zone and reach the desired depth with significant amount of energy. In this study, the application of three-dimensional (3D) cross-well elastic reverse time migration (RTM) imaging based on multi-wave and multi-component techniques in coastal engineering exploration is explored. Accurate decomposition of vector co

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15

Gong, Xufei, Qizhen Du, and Qiang Zhao. "SP- and SS-imaging for 3D elastic reverse time migration." GEOPHYSICS 83, no. 1 (2018): A1—A6. http://dx.doi.org/10.1190/geo2017-0286.1.

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Three-dimensional elastic reverse time migration has been confronted with the problem of generating scalar images with vector S-waves. The underlying principle for solving this problem is to convert the vector S-waves into scalars. Previous methods were mainly focused on PS-imaging, but they usually cannot work properly on SP- and SS-cases. The complexity of SP- and SS-imaging arises from the fact that the incident S-wave has unpredictable relationship with the raypath plane. We have suggested that S-wave should be treated separately as SV- and SH-waves, which keep predictable relationships wi

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16

Bertelli, Iacopo, Joris J. Carmiggelt, Tao Yu, et al. "Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator." Science Advances 6, no. 46 (2020): eabd3556. http://dx.doi.org/10.1126/sciadv.abd3556.

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Spin waves—the elementary excitations of magnetic materials—are prime candidate signal carriers for low-dissipation information processing. Being able to image coherent spin-wave transport is crucial for developing interference-based spin-wave devices. We introduce magnetic resonance imaging of the microwave magnetic stray fields that are generated by spin waves as a new approach for imaging coherent spin-wave transport. We realize this approach using a dense layer of electronic sensor spins in a diamond chip, which combines the ability to detect small magnetic fields with a sensitivity to the

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17

Ahmed, Rifat, Scott A. Gerber, Stephen A. McAleavey, Giovanni Schifitto, and Marvin M. Doyley. "Plane-Wave Imaging Improves Single-Track Location Shear Wave Elasticity Imaging." IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, no. 8 (2018): 1402–14. http://dx.doi.org/10.1109/tuffc.2018.2842468.

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18

Jia, Yanqing, Qing Hu, and Shengquan Li. "Enhanced underwater three-dimensional imaging using acoustic orbital angular momentum waves and mode matching beamforming." Journal of the Acoustical Society of America 157, no. 2 (2025): 880–96. https://doi.org/10.1121/10.0035792.

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Improving the underwater three-dimensional imaging resolution of a sonar system is of great significance to achieving high-precision ocean exploration results. Actually, improving the resolution can be considered from the perspective of information acquisition. The acoustic orbital angular momentum (AOAM) wave has a modal dimension and can carry more target information. However, there are few studies on the application of AOAM waves for underwater three-dimensional imaging. This paper establishes the related signal models of the AOAM wave in underwater imaging and examines the sound field char

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19

Wei, Zhou-Tuo, and Xiao-Ming Tang. "Numerical simulation of radiation, reflection, and reception of elastic waves from a borehole dipole source." GEOPHYSICS 77, no. 6 (2012): D253—D261. http://dx.doi.org/10.1190/geo2012-0061.1.

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A recent advance in single-well reflection imaging is the use of a dipole acoustic system in a borehole to radiate and receive elastic waves to and from a remote geologic reflector in formation. This dipole-acoustic imaging technology is evaluated by numerically simulating the radiation and reflection of the wavefield generated by the borehole dipole source and analyzing the receiving sensitivity of the dipole system to the incoming reflected waves. The analyses show that a borehole dipole source can radiate a compressional wave (P-wave) and two types of shear waves (i.e., SV- and SH-waves) in

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20

Yukun Zhu, Yukun Zhu, Minghui Yang Minghui Yang, Liang Wu Liang Wu, Yun Sun Yun Sun, and and Xiaowei Sun and Xiaowei Sun. "Practical millimeter-wave holographic imaging system with good robustness." Chinese Optics Letters 14, no. 10 (2016): 101101–5. http://dx.doi.org/10.3788/col201614.101101.

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21

Lu, Richard S., Dennis E. Willen, and Ian A. Watson. "Identifying, removing, and imaging P‐S conversions at salt‐sediment interfaces." GEOPHYSICS 68, no. 3 (2003): 1052–59. http://dx.doi.org/10.1190/1.1581076.

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The large velocity contrast between salt and the surrounding sediments generates strong conversions between P‐ and S‐wave energy. The resulting converted events can be noise on P‐wave migrated images and should be identified and removed to facilitate interpretation. On the other hand, they can also be used to image a salt body and its adjacent sediments when the P‐wave image is inadequate. The converted waves with smaller reflection and transmission angles and much larger critical angles generate substantially different illumination than does the P‐wave. In areas where time migration is valid,

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22

Lu, Jian-Yu. "Super-resolution imaging with modulation of point spread function." Journal of the Acoustical Society of America 153, no. 3_supplement (2023): A28. http://dx.doi.org/10.1121/10.0018036.

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The spatial resolution of an imaging system using waves is limited by the spatial bandwidth of the point spread function (PSF) of the system, which is related to the wavelength. However, when the PSF is modulated either in amplitude or phase or in both, the resulting spatial bandwidth of the PSF is increased. In this study, the PSF-modulation method is used to obtain super-resolution imaging of objects and to distinguish wave sources that are closely located in space and are not normally separable due to diffraction limit. In imaging using waves, such as ultrasound, acoustics, optics, electrom

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23

Borcea, Liliana, Josselin Garnier, Alexander V. Mamonov, and Jörn Zimmerling. "Reduced order model approach for imaging with waves." Inverse Problems 38, no. 2 (2021): 025004. http://dx.doi.org/10.1088/1361-6420/ac41d0.

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Abstract We introduce a novel, computationally inexpensive approach for imaging with an active array of sensors, which probe an unknown medium with a pulse and measure the resulting waves. The imaging function is based on the principle of time reversal in non-attenuating media and uses a data driven estimate of the ‘internal wave’ originating from the vicinity of the imaging point and propagating to the sensors through the unknown medium. We explain how this estimate can be obtained using a reduced order model (ROM) for the wave propagation. We analyze the imaging function, connect it to the t

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24

Zhou, Xiyan, Xu Chang, Yibo Wang, and Zhenxing Yao. "Amplitude-preserving scalar PP and PS imaging condition for elastic reverse time migration based on a wavefield decoupling method." GEOPHYSICS 84, no. 3 (2019): S113—S125. http://dx.doi.org/10.1190/geo2017-0840.1.

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To eliminate crosstalk within the imaging results of elastic reverse time migration (ERTM), we can separate the coupled P- and S-waves from the forward source wavefield and the backpropagated receiver wavefield. The P- and S-wave decoupling method retains the original phase, amplitude, and physical meaning in the separated wavefields. Thus, it is a vital wavefield separation method in ERTM. However, because these decomposed wavefields are vectors, we could consider how to retrieve scalar images that reveal the real reflectivity of the subsurface. For this purpose, we derive a scalar P-wave equ

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25

Pirogov, Yu A. "Passive Millimeter-Wave Imaging." Radiophysics and Quantum Electronics 46, no. 8/9 (2003): 594–603. http://dx.doi.org/10.1023/b:raqe.0000024990.28312.6e.

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26

Salles, Sebastien, Lasse Lovstakken, Svein Arne Aase, Tore Gruner Bjastad, and Hans Torp. "Clutter Filter Wave Imaging." IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 66, no. 9 (2019): 1444–52. http://dx.doi.org/10.1109/tuffc.2019.2923710.

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27

Kleine-Ostmann, T., P. Knobloch, M. Koch, et al. "Continuous-wave THz imaging." Electronics Letters 37, no. 24 (2001): 1461. http://dx.doi.org/10.1049/el:20011003.

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28

Sasaki, Tetsuo. "4 Terahertz Wave Imaging." Journal of the Institute of Image Information and Television Engineers 67, no. 6 (2013): 460–64. http://dx.doi.org/10.3169/itej.67.460.

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29

Sawaya, Kunio, Hiroyasu Sato, and Koji Mizuno. "5 Millimeter Wave Imaging." Journal of the Institute of Image Information and Television Engineers 67, no. 6 (2013): 465–67. http://dx.doi.org/10.3169/itej.67.465.

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30

Yujiri, L., M. Shoucri, and P. Moffa. "Passive millimeter-wave imaging." IEEE Microwave Magazine 4, no. 3 (2003): 39–50. http://dx.doi.org/10.1109/mmw.2003.1237476.

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31

Appleby, R., and A. H. Lettington. "Passive millimetre wave imaging." Electronics & Communications Engineering Journal 3, no. 1 (1991): 13. http://dx.doi.org/10.1049/ecej:19910004.

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32

David Suits, L., TC Sheahan, J.-S. Lee, and J. Carlos Santamarina. "P-Wave Reflection Imaging." Geotechnical Testing Journal 28, no. 2 (2005): 12595. http://dx.doi.org/10.1520/gtj12595.

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33

Xu, Jingzhou, and X. C. Zhang. "Terahertz wave reciprocal imaging." Applied Physics Letters 88, no. 15 (2006): 151107. http://dx.doi.org/10.1063/1.2194822.

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34

Schotland, John C. "Continuous-wave diffusion imaging." Journal of the Optical Society of America A 14, no. 1 (1997): 275. http://dx.doi.org/10.1364/josaa.14.000275.

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35

Wilson, W. J., R. J. Howard, A. Ibbott, G. S. Parks, and W. B. Ricketts. "Millimeter-Wave Imaging Sensor." IEEE Transactions on Microwave Theory and Techniques 34, no. 10 (1986): 1026–35. http://dx.doi.org/10.1109/tmtt.1986.1133492.

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36

Du, Qizhen, Fang Li, Jing Ba, Yitong Zhu, and Bo Hou. "Multicomponent joint migration velocity analysis in the angle domain for PP-waves and PS-waves." GEOPHYSICS 77, no. 1 (2012): U1—U13. http://dx.doi.org/10.1190/geo2010-0423.1.

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Employing the vector processing of multicomponent seismic data, elastic Kirchhoff migration is used to conduct a multicomponent joint migration velocity analysis (MVA) of PP- and PS-waves in the angle domain. In vector-wavefield imaging, the elastic imaging condition has been extended to nonzero time and space shifts. We apply the extended imaging condition to elastic Kirchhoff migration to extract angle-domain common-image gathers (ADCIGs) of PP- and PS-waves. This method, which is derived from 3D wave propagation theory, directly operates on the vector wavefields and automatically resolves t

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Liu, Hongwei, Mustafa Naser Al-Ali, and Yi Luo. "Converted-wave model building and imaging based on common-focus-point methodology." GEOPHYSICS 85, no. 6 (2020): U139—U149. http://dx.doi.org/10.1190/geo2019-0549.1.

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Seismic images can be viewed as photographs for underground rocks. These images can be generated from different reflections of elastic waves with different rock properties. Although the dominant seismic data processing is still based on the acoustic wave assumption, elastic wave processing and imaging have become increasingly popular in recent years. A major challenge in elastic wave processing is shear-wave (S-wave) velocity model building. For this reason, we have developed a sequence of procedures for estimating seismic S-wave velocities and the subsequent generation of seismic images using

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38

O’Brien, John, and Ron Harris. "Multicomponent VSP imaging of tight-gas sands." GEOPHYSICS 71, no. 6 (2006): E83—E90. http://dx.doi.org/10.1190/1.2335646.

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Low-porosity Bossier and Cotton Valley sands of the East Texas Basin, U. S., have only a small acoustic impedance contrast with the encasing shales but a greater relative contrast in shear-wave impedance. Vertical seismic profile (VSP) data acquired with both a near-offset and far-offset P-wave source clearly demonstrate the P-P reflectivity and P-S mode conversions within the Bossier section. We designate conventional P-wave reflectivity as P-P, shear-wave reflectivity as S-S, and P-wave/shear-wave mode conversion data as P-S. While Bossier P-P reflectivity is low, it appears to be adequate f

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39

Archer, Branch T., Yu-Hsuan Chao, John M. Cormack, Kang Kim, Kyle S. Spratt, and Mark F. Hamilton. "Surface excitation of focused shear wave beams in soft elastic media: Theory." Journal of the Acoustical Society of America 152, no. 4 (2022): A46. http://dx.doi.org/10.1121/10.0015489.

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Shear wave propagation is employed in medical ultrasound imaging, because it reveals variation in the viscoelastic properties of tissue. Frequencies below 1 kHz are required for imaging with shear waves in soft tissue due to their high attenuation and low propagation speeds, compared to compressional waves with frequencies above 1 MHz used for ultrasound imaging. Shear waves exhibiting particle motion in the direction of propagation, referred to as longitudinally polarized shear waves, can be generated by applying longitudinal motion of a circular disk to the surface of a soft elastic medium.

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He, Yijun. "Ocean wave imaging mechanism by imaging radar." Science in China Series D: Earth Sciences 43, no. 6 (2000): 587–95. http://dx.doi.org/10.1007/bf02879502.

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Honer, Jacob S., and Robert J. McGough. "Simulating plane wave imaging with the fast nearfield method." Journal of the Acoustical Society of America 156, no. 4_Supplement (2024): A88. https://doi.org/10.1121/10.0035203.

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Conventional B-mode imaging suffers from limited frame rates due to compounded travel times. In contrast, plane wave imaging has emerged as a high-speed solution, offering superior frame rates while preserving resolution and contrast. Simulation plays a pivotal role in testing and refining new imaging algorithms, which is crucial for further development of plane wave imaging. However, limited support exists in current ultrasound simulation packages for plane wave imaging simulations. To address this deficiency, plane wave imaging support is incorporated into FOCUS, the “Fast Object-oriented C+

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Xiong, Shu, and Jun Lu. "Joint consistent static correction of PP- and PS-waves: A case history of Basin A." GEOPHYSICS 87, no. 3 (2022): B207—B220. http://dx.doi.org/10.1190/geo2021-0119.1.

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The shallow S-wave velocity model is difficult to accurately obtain in seismic exploration, resulting in poor imaging quality when traditional static correction methods are applied to PS-waves. Moreover, unlike for PP-waves, identifying an interface near the water table to use as the datum for PS-waves is almost impossible in many cases. We have developed a case history of joint consistent static correction for PP- and PS-waves of Basin A in Sichuan province, China. In our workflow, crosscorrelation calculation is performed on PP-wave common shotpoint and common receiver-point stacked sections

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43

You, Jiachun, Sha Song, Umberta Tinivella, Michela Giustiniani, and Iván Vargas-Cordero. "Amplitude-Preserved Wave Equation: An Example to Image the Gas Hydrate System." Energies 14, no. 12 (2021): 3700. http://dx.doi.org/10.3390/en14123700.

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Natural gas hydrate is an important energy source. Therefore, it is extremely important to provide a clear imaging profile to determine its distribution for energy exploration. In view of the problems existing in conventional migration methods, e.g., the limited imaging angles, we proposed to utilize an amplitude-preserved one-way wave equation migration based on matrix decomposition to deal with primary and multiple waves. With respect to seismic data gathered at the Chilean continental margin, a conventional processing flow to obtain seismic records with a high signal-to-noise ratio is intro

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Laloy-Borgna, Gabrielle, Stefan Catheline, Léo Puyo, Hidero Nishino, and Michael Atlan. "Flexion pulse wave in the retina: Toward à mechanical characterization of blood vessels?" Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A94. http://dx.doi.org/10.1121/10.0022908.

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The risk of cardiovascular events is linked to arterial elasticity that can be estimated from the pulse wave velocity. This symmetric wave velocity is related to the wall elasticity through the Moens–Korteweg equation. However, ultrasound imaging techniques need improved accuracy, and optical measurements on retinal arteries produce inconsistent results. After a quick historical review, it will be shown that the observation of an antisymmetric pulse wave, namely, the flexural pulse wave is possible. An optical system performs invivo wave velocity measurements on retinal arteries and veins. Vel

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Zhang, Zhishuai, James W. Rector, and Michael J. Nava. "Microseismic hydraulic fracture imaging in the Marcellus Shale using head waves." GEOPHYSICS 83, no. 2 (2018): KS1—KS10. http://dx.doi.org/10.1190/geo2017-0184.1.

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We have studied microseismic data acquired from a geophone array deployed in the horizontal section of a well drilled in the Marcellus Shale near Susquehanna County, Pennsylvania. Head waves were used to improve event location accuracy as a substitution for the traditional P-wave polarization method. We identified that resonances due to poor geophone-to-borehole coupling hinder arrival-time picking and contaminate the microseismic data spectrum. The traditional method had substantially greater uncertainty in our data due to the large uncertainty in P-wave polarization direction estimation. We

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46

Mi, Binbin, and Jianghai Xia. "Surface-Wave Imaging with Nonrandom Traffic Noise Sources." Journal of Physics: Conference Series 2651, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2651/1/012026.

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Abstract We analyze the influence of nonrandom traffic noise sources on surface wave imaging. With nonrandom traffic noise sources in time (correlated sources), spurious signals are produced in the crosscorrelation functions. With nonrandom traffic noise sources in space (directional sources), phase velocities are overestimated from the retrieved surface waves. The retrieval of surface waves can be improved by stationary-phase segment selection, cross-coherence and stacking of the results from multiple traffic noise sources. Synthetic results demonstrate that cross-coherence and stacking of mu

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47

Jing, Charlie, Thomas A. Dickens, and Graham A. Winbow. "Vector imaging of converted wave data in laterally uniform media with VTI anisotropy." GEOPHYSICS 71, no. 4 (2006): S141—S145. http://dx.doi.org/10.1190/1.2213048.

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A vector imaging method has been developed for PS-converted waves in laterally homogeneous vertically transverse isotropic (VTI) media. It decomposes the converted-wave data into two upgoing quasi-shear waves ([Formula: see text] and [Formula: see text]) within the prestack migration algorithm according to subsurface image and surface receiver locations. Because the decomposition is performed as part of the migration, it is consistent with the dip and polarization of the seismic events, unlike traditional algorithms that use premigration rotations. Two shear-wave images with potentially enhanc

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48

Mittal, Sita Ram. "Effect of Arrhythmias on Tissue Doppler Velocities." Journal of The Indian Academy of Echocardiography & Cardiovascular Imaging 2, no. 3 (2018): 185–90. http://dx.doi.org/10.4103/jiae.jiae_16_18.

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Sa wave of tissue Doppler imaging correlates with ventricular systole (QRS-T of electrocardiogram). Ea wave correlates with ventricular filling in early diastole. Aa wave correlates with ventricular filling during atrial contraction and correlates with P wave of electrocardiogram. Therefore, a careful analysis of the relation between Ea and Aa waves gives a correct impression about the underlying cardiac arrhythmia. In sinus bradycardia, all waves are normal, but the distance between Ea and Aa wave is increased. In sinus tachycardia, Aa wave comes closer to Ea wave and may even fuse with Ea wa

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49

Arifullah, Arifullah, Nadri Pratama, Ikramullah Zein, et al. "Imaging of Hydrodynamic Field Around Submerged Objects Regular Wave and Tsunami Conditions." E3S Web of Conferences 447 (2023): 01011. http://dx.doi.org/10.1051/e3sconf/202344701011.

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Hydrodynamic particle movement under regular waves and tsunami wave are rarely studied due to its complicated sensors. This research is aimed at investigating flow fields around submerged structures due to regular waves and tsunami wave. A series of experiments were performed at Tsunami Flume Workshop Facility at Tsunami and Disaster Mitigation Research Center (TDMRC) of Universitas Syiah Kuala. The flume has 60 m in length, 2.5 m in width and 1.7 m in height. To model the both waves, a set of electrical paddle and sensors were placed at one end of the flume. This set of equipment is able to m

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Xie, Xiao-Bi, and Ru-Shan Wu. "Multicomponent prestack depth migration using the elastic screen method." GEOPHYSICS 70, no. 1 (2005): S30—S37. http://dx.doi.org/10.1190/1.1852787.

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A 3D multicomponent prestack depth-migration method is presented. An elastic-screen propagator based on one-way wave propagation with a wide-angle correction is used to extrapolate both source and receiver wavefields. The elastic-screen propagator neglects backscattered waves but can handle forward multiple-scattering effects, such as focusing/defocusing, diffraction, interference, and conversions between P- and S-waves. Vector-imaging conditions are used to generate a P-P image and a P-S converted-wave image. The application of the multicomponent elastic propagator and vector-imaging conditio

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