Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021GL095024 |
High-resolution Imaging of Complex Shallow Fault Zones Along the July 2019 Ridgecrest Ruptures | |
Zheng Zhou; Michael Bianco; Peter Gerstoft; Kim Olsen | |
2021-12-16 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | We perform ambient noise tomography (ANT) using data recorded on 342 seismographs within a 50 × 50 km area inside which the July 2019 M7.1 and M6.4 Ridgecrest earthquakes occurred. We used the locally sparse tomography (LST) method, an unsupervised machine learning approach that learns to represent small-scale geophysical structures using only data from the immediate study. The Rayleigh group speed obtained from LST better predicts travel times than conventional regularized least-squares inversion. The 3D shear velocity model of the area obtained from the surface wave dispersion maps reveals a highly heterogeneous low-velocity zone (LVZ, with the primary velocity reduction in the upper 2-3 km) around the causative faults for the M7.1 and M6.4 events, with a 40% reduction of the shear wave velocity. Further, correlation of other imaged LVZs in the model area with parts of the Little Lake Fault System without recent activity may indicate long-lasting damage zones. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/344252 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Zheng Zhou,Michael Bianco,Peter Gerstoft,et al. High-resolution Imaging of Complex Shallow Fault Zones Along the July 2019 Ridgecrest Ruptures[J]. Geophysical Research Letters,2021. |
APA | Zheng Zhou,Michael Bianco,Peter Gerstoft,&Kim Olsen.(2021).High-resolution Imaging of Complex Shallow Fault Zones Along the July 2019 Ridgecrest Ruptures.Geophysical Research Letters. |
MLA | Zheng Zhou,et al."High-resolution Imaging of Complex Shallow Fault Zones Along the July 2019 Ridgecrest Ruptures".Geophysical Research Letters (2021). |
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