Article
Geochemistry & Geophysics
Lu Liu, Yujin Liu, Tao Li, Yi He, Yue Du, Yi Luo
Summary: Vehicle-induced vibrations can provide useful signals for passive seismic exploration, offering an economical and efficient way to analyze subsurface structures. Utilizing seismic interferometry and RNN, real-time monitoring of 1D subsurface S-wave velocities along roads or railways is made possible.
Article
Geosciences, Multidisciplinary
Fei Ma, Fanghui Hou, Tongyu Li, Zhiqiang Wu, Jianzhong Zhang
Summary: The crustal velocity structure in the South Yellow Sea Basin was determined using OBS data and traveltime tomography. A joint tomographic inversion of the traveltime and its gradient data improved the resolution of the inverted velocity structure. The study revealed the extension of a high-velocity body, the presence of a low-velocity Cretaceous strata, and the retention of thick Meso-Paleozoic marine strata in the SYS Basin.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Wenzhi Sun, Zhenchun Li, Yingming Qu
Summary: This article introduces a new type of Radon transform defined on circular cones for seismic signal processing. Compared with the traditional linear Radon transform, this new transform significantly improves the resolution in slowness.
Review
Geochemistry & Geophysics
Yudi Pan, Lingli Gao
Summary: Shallow-seismic full-waveform inversion (FWI) is an effective method for accurate reconstruction of near-surface models. However, it suffers from ill-posedness and high computational cost. The recently proposed random-objective waveform inversion (ROWI) method shows better efficiency and robustness than FWI.
SURVEYS IN GEOPHYSICS
(2023)
Article
Geochemistry & Geophysics
Yiming Bai, Yumei He, Xiaohui Yuan, Frederik Tilmann, Yinshuang Ai, Mingming Jiang, Guangbing Hou, Chit Thet Mon, Myo Thant, Kyaing Sein
Summary: The seismic structure of the crust and uppermost mantle in eastern Myanmar remains highly debated. Through seismic waveforms recorded at 79 broadband stations, we observe variations in seismic velocity and discontinuity structures, such as varying sediment thickness and low-velocity anomalies indicating subduction and magma channels.
Article
Geochemistry & Geophysics
Yuqing Chen, Erdinc Saygin
Summary: This study introduces a method that combines hybrid machine learning and automatic differentiation to invert subsurface velocity models. By inverting the low-dimensional representation of high-dimensional seismic data, known as LS features, the method successfully recovers information about the subsurface velocity model.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Multidisciplinary Sciences
Xinpeng Pan, Dazhou Zhang, Pengfei Zhang
Summary: This study proposes a more robust azimuth-dependent seismic inversion method by combining Bayesian inference and joint time-frequency-domain inversion theory, introducing regularizations to improve inversion reliability. The comparison of frequency bandwidth under different noise levels demonstrates that joint time-frequency-domain inversion may provide a more stable technique for fracture detection in fractured reservoirs.
SCIENTIFIC REPORTS
(2021)
Article
Geochemistry & Geophysics
Nanqiao Du, Zhiwei Li, Tianyao Hao, Xin Xia, Yutao Shi, Ya Xu
Summary: A joint tomographic inversion method combining seismic surface wave dispersion and gravity data was developed in this study to achieve more reliable crustal 3-D shear wave structures. The method was shown to better match the gravity data and provide more constraints into the model resolution, improving the reliability of the results.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Lu Liu, Tong Fei, Yi Luo
Summary: Seismic waves carry attenuation information related to subsurface viscoelastic features when they illuminate the subsurface medium and propagate back to the surface. A novel method called common-transmission gather (CTG) has been developed to directly indicate these seismic attenuation features. CTG is generated by isolating the seismic events passing through the targets after computing the transmitted arrivals from a redatumed source to the related surface receivers. The CTG has been validated by field data sets and can be used to directly indicate seismic attenuation.
Article
Geochemistry & Geophysics
Xiaozhou Yang, Yinhe Luo, Chengxin Jiang, Yingjie Yang, Fenglin Niu, Guoliang Li
Summary: In this study, a 3D shear velocity model is constructed to investigate the fine scale structural features of the crustal and upper mantle depths beneath southeastern Tibet. The model identifies three independent low-velocity zones in the mid-lower crust, including a prominent one beneath the North Chuan-Dian Block and another one beneath the Tengchong volcano. It also observes strong velocity reductions in localized areas in the upper mantle, indicating their association with lithospheric thickening and delamination processes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Xiaozhou Yang, Yinhe Luo, Chengxin Jiang, Yingjie Yang, Fenglin Niu, Guoliang Li
Summary: Based on joint inversion of Rayleigh wave phase velocity and teleseismic body wave data, a 3D shear velocity model is constructed to investigate the fine-scale structural features of the crustal and upper mantle depths (<250 km) beneath Southeastern Tibet (SET). This study provides important clues for understanding the dynamic processes related to the continental collision between the Indian and Eurasian plates.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Chemistry, Analytical
Maayan Gelboim, Amir Adler, Yen Sun, Mauricio Araya-Polo
Summary: This paper presents a deep learning solution for reconstructing realistic 3D models in seismic surveys. The proposed method efficiently processes hundreds of seismic shot-gather cubes and achieves a structural similarity index measure of 0.9143 under a 10 dB signal-to-noise ratio.
Article
Geochemistry & Geophysics
Chen Liao, Xiangyun Hu, Shihui Zhang, Xuewen Li, Quanzeng Yin, Zhao Zhang, Longfei Zhang
Summary: Joint inversion is an effective technique for obtaining high-resolution solutions in geophysics. In this study, a new inversion strategy based on the alternating direction method of multipliers was proposed for convenient and efficient joint inversion. Three optimization algorithms were presented for different types of geophysical data, resulting in more accurate results compared to separate inversions. The algorithms were successfully applied to field data, verifying the practicality of the inversion strategy.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Tong Zhou, Ziyi Xi, Min Chen, Jiaqi Li
Summary: This article investigates how to select an optimal initial model for inverting the internal structure of the Earth to improve existing 3-D seismic velocity models. By assessing waveform fitting and misfit functions, the authors choose a hybrid initial model that better captures the characteristics of seismic waves.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Tong Zhou, Ziyi Xi, Min Chen, Jiaqi Li
Summary: By optimizing seismic wave speed models, better seismological constraints can be provided, and it is found that discrepancies exist in short-period waveforms in 3D models, revealing that smaller scale heterogeneities and radial anisotropy in the crust and upper mantle are not well constrained. Based on test results, a hybrid initial model combining S40RTS or S362ANI in the mantle and CRUST1.0 in the crust is suitable for future refinements of the lithospheric structure in North America.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Avinash Nayak, Douglas S. Dreger
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2015)
Article
Geochemistry & Geophysics
Avinash Nayak, Douglas S. Dreger
GEOPHYSICAL JOURNAL INTERNATIONAL
(2018)
Article
Multidisciplinary Sciences
Taka'aki Taira, Avinash Nayak, Florent Brenguier, Michael Manga
Article
Geochemistry & Geophysics
Avinash Nayak, Douglas S. Dreger
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2014)
Article
Geochemistry & Geophysics
L. M. Parker, C. H. Thurber, X. Zeng, P. Li, N. E. Lord, D. Fratta, H. F. Wang, M. C. Robertson, A. M. Thomas, M. S. Karplus, A. Nayak, K. L. Feigl
SEISMOLOGICAL RESEARCH LETTERS
(2018)
Article
Geochemistry & Geophysics
Natalia A. Ruppert, Avinash Nayak, Clifford Thurber, Cole Richards
SEISMOLOGICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
Avinash Nayak, Clifford H. Thurber
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geochemistry & Geophysics
Avinash Nayak, Michael Manga, Shaul Hurwitz, Atsuko Namiki, Phillip B. Dawson
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Avinash Nayak, Jonathan Ajo-Franklin
Summary: The study tested the ability of a dark-fiber DAS array in northern California to detect small seismic phases from distant seismic events, showing significant potential of DAS for local and regional detection of small seismic events.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Avinash Nayak, Jonathan Ajo-Franklin
Summary: The study introduces a new method for estimating surface waves through cross-correlation of velocity noise recorded by seismometers and strain-rate noise recorded by DAS arrays. Results show convergence to empirical surface-wave response at DAS arrays and separate analysis of Rayleigh waves and Love waves using a tangential-radial-vertical reference frame with respect to each DAS channel. The study extends the application of DAS to 3D ambient noise Rayleigh-wave and Love-wave tomography, demonstrating consistent phase-velocity dispersion measurements with traditional noise cross-correlations.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Xiangdong Lin, Huaiyu Yuan, Michael C. Dentith, Ruth Murdie, Klaus Gessner, Avinash Nayak
Summary: Studies show that seismic stress in Western Australia is influenced by both local factors and large-scale plate driving forces, with thrust and strike-slip mechanisms dominating the faulting patterns. This indicates that seismic activity in the region is closely related to the local geological structure.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Tong Bai, Avinash Nayak, Clifford Thurber, Xiangfang Zeng, Matthew Haney
Summary: This study presents an ambient noise tomographic study of the mid-crustal magmatic system in the Katmai area in Alaska. The most notable feature is a 25 km wide low-velocity anomaly beneath the Katmai area, interpreted as a mid-crustal magma storage zone.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Feng Cheng, Jonathan B. Ajo-Franklin, Avinash Nayak, Veronica Rodriguez Tribaldos, Robert Mellors, Patrick Dobson
Summary: We utilize distributed acoustic sensing (DAS) and ambient noise interferometry to image the geothermal reservoirs in Imperial Valley, California, using unlit fiber-optic telecommunication infrastructure (dark fiber). By applying ambient noise interferometry to DAS records, we obtain a high-resolution two-dimensional (2D) S wave velocity (V-s) structure to a depth of 3 km. We discover a high V-s and low V-p/V-s ratio feature beneath the Brawley geothermal system, indicating hydrothermal mineralization and lower porosity.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Computer Science, Interdisciplinary Applications
Anna Barth, Leif Karlstrom, Benjamin K. Holtzman, Arthur Pate, Avinash Nayak
COMPUTER MUSIC JOURNAL
(2020)