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| DOI | 10.1029/2021JB021818 |
| Adjoint-State Traveltime Tomography: Eikonal Equation-Based Methods and Application to the Anza Area in Southern California | |
| Tong P. | |
| 发表日期 | 2021 |
| ISSN | 21699313 |
| 卷号 | 126期号:5 |
| 英文摘要 | Ray tracing is avoidable in seismic traveltime tomography. In this study, seismic traveltime tomography is reformulated as an eikonal equation-constrained optimization problem solved by the ray-free adjoint-state method. The resultant approach is called adjoint-state traveltime tomography. For completeness, an eikonal equation-based earthquake location method is developed to locate the hypocenters of earthquakes when necessary. The multiple-grid model parameterization is adopted to discretize the relative slowness perturbation (Formula presented.). The step-size-controlled gradient descent method, which has an effect of damping regularization, is used to find optimal earthquake hypocenters and velocity models. The performances of the earthquake location and adjoint-state traveltime tomography methods are tested in the source area of the 2020 Mw 4.9 Anza earthquake, a seismologically active place in southern California. The obtained high-resolution P-wave velocity model demonstrates that the 2020 Mw 4.9 Anza earthquake and other historic moderate-sized Anza earthquakes occurred near or at the boundaries of low VP rocks, a typical seismogenic environment for moderate to large crustal earthquakes. Meanwhile, the source zone of the Anza earthquakes is characterized by high VP/VS, indicating the possible existence of crustal fluids as well as the critical role of fluids in the occurrence of those moderated-sized Anza earthquakes. On the whole, the well-performed eikonal equation-based earthquake location method and adjoint-state traveltime tomography method provide competent and attractive tools for hypocenter and tomographic inversions. © 2021. American Geophysical Union. All Rights Reserved. |
| 语种 | 英语 |
| 来源期刊 | Journal of Geophysical Research: Solid Earth
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/187093 |
| 作者单位 | Division of Mathematical Sciences, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore; Asian School of the Environment, Nanyang Technological University, Singapore, Singapore; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore |
| 推荐引用方式 GB/T 7714 | Tong P.. Adjoint-State Traveltime Tomography: Eikonal Equation-Based Methods and Application to the Anza Area in Southern California[J],2021,126(5). |
| APA | Tong P..(2021).Adjoint-State Traveltime Tomography: Eikonal Equation-Based Methods and Application to the Anza Area in Southern California.Journal of Geophysical Research: Solid Earth,126(5). |
| MLA | Tong P.."Adjoint-State Traveltime Tomography: Eikonal Equation-Based Methods and Application to the Anza Area in Southern California".Journal of Geophysical Research: Solid Earth 126.5(2021). |
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