High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography
文献类型：SCI/SSCI论文
| 作者 | Pei S. P. ; Chen Y. J. ; Feng B. A. ; Gao X. ; Su J. R. |
| 发表日期 | 2013 |
| 关键词 | Yushu earthquake Seismic tomography Aftershocks Seismic velocity anomaly Anisotropy travel-time tomography uppermost mantle velocities surrounding regions beneath china pn tomography fault inversion motion media rock |
| 英文摘要 | To investigate upper crust anisotropy, a tomography algorithm was reformulated to include lateral variations in both velocity and azimuthal anisotropy, and it was applied to Pg travel time data around the epicenter of the 14 April 2010 Ms = 7.1 Yushu earthquake. A high-resolution two-dimensional (horizontal) seismic velocity and azimuthal anisotropy model was obtained using this simple tomography method including both station and event depth corrections. The results show clear anisotropy in the upper crust and it is as important as the velocity variation in explaining the travel time residuals. The most striking result is a high velocity anomaly with large anisotropy at the epicenter on the Yushu-Garze fault. The main rupture originated within this high velocity anomaly and propagated southeastward into a low velocity anomaly with small anisotropy at Yushu. The azimuthal anisotropy shows fast velocity direction along Yushu-Garze fault and larger anisotropy exists in the epicenter than surrounding regions. These results demonstrate a clear example that lateral variation and anisotropy in seismic structures of the upper crust controlled the origination (stress accumulation) and rupture propagation of the 2010 Yushu earthquake and distribution of aftershocks as well. The simple 2D Pg-wave travel time tomography method presented here introduces a new approach utilizing abundant aftershocks data for investigating the rupturing process of a major earthquake and possible fracture distribution around seismogenic zone. (C) 2012 Elsevier B.V. All rights reserved. |
| 出处 | Tectonophysics |
| 卷 | 584 |
| 页 | 144-151 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0040-1951 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30320]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Pei S. P.,Chen Y. J.,Feng B. A.,et al. High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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