Source Mechanisms of Small Earthquakes and Tectonic Stress Field in Xiaojiang, Yunnan

被引：0
|
作者：
Pei W. [1 ]
Yang Z. [2 ]
Zhou S. [1 ]
机构：
[1] Institute of Theoretical and Applied Geophysics, School of Earth and Space Sciences, Peking University, Beijing
[2] Yunnan Earthquake Agency, Kunming
来源：
Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis | 2022年 / 58卷 / 04期
关键词：
focal mechanism; tectonic stress field; Xiaojiang Fault Zone;
D O I：
10.13209/j.0479-8023.2022.043
中图分类号：
学科分类号：
摘要：
674 small earthquakes occurred from 2016 to 2019 near Xiaojiang Fault Zone, Yunnan are relocated using local dense array data. The focal mechanisms of 222 small earthquakes around are determined by HASH algorithm using P-wave first-motion polarities and S/P amplitude ratios. The tectonic stress field is inversed by MSTASI algorithm. The results indicate that the earthquakes around Xiaojiang Fault Zone are mainly left lateral strike slip, and the direction of principal compressive stress obtained from focal mechanism inversion is NW-SE, which is in good agreement with previous research results and regional GPS observation results. Compared with the north section of Xiaojiang Fault Zone, the horizontal tectonic compressive stress in the middle and south section has been reduced, which might be related with tectonic stress release. © 2022 Peking University. All rights reserved.
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页码：602 / 608
页数：6
相关论文
共 14 条
  • [1] (1987)
  • [2] (2004)
  • [3] (2003)
  • [4] Hardebeck J L, Shearer P M., A new method for determining first-motion focal mechanisms, Bulletin of the Seismological Society of America, 92, 6, pp. 2264-2276, (2002)
  • [5] Hardebeck J L, Shearer P M., Using S/P amplitude ratios to constrain the focal mechanisms of small earthquakes, Bulletin of the Seismological Society of America, 93, 6, pp. 2434-2444, (2003)
  • [6] Martinez-Garzon P, Kwiatek G, Bohnhoff M, Et al., Msatsi: a matlab package for stress inversion combining solid classic methodology, a new simplified user-handling, and a visualization tool, Seismological Research Letters, 85, 4, pp. 896-904, (2014)
  • [7] Zhou Y, Yue H, Kong Q, Et al., Hybrid event detection and phase-picking algorithm using convolutional and recurrent neural networks, Seismological Research Letters, 90, 3, (2019)
  • [8] Chunquan Yu, Yingcai Zheng, Shang Xuefeng, Crazyseismic: a matlab gui-based software package for passive seismic data preprocessing, Seismological Research Letters, 88, 2A, pp. 410-415, (2017)
  • [9] Klein F W., User’s guide to HYPOINVERSE-2000: a Fortran program to solve for earthquake locations and magnitudes (No. 2002‒171), (2002)
  • [10] Breckpot R, Marzec M K., ObsPy: a Python toolbox for seismology, Seismological Research Letters, 81, 3, pp. 530-533, (2010)
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