2020年新疆于田MS6.4地震发震断层及孕震机制研究

doi:10.12196/j.issn.1000-3274.2021.02.007

地震 ›› 2021, Vol. 41 ›› Issue (2): 92-101.doi: 10.12196/j.issn.1000-3274.2021.02.007

2020年新疆于田M_S6.4地震发震断层及孕震机制研究

王勤彩¹, 李君², 张金川³

1.中国地震局地震预测研究所, 北京 100036;
2.中国地震局第二监测中心, 陕西西安 710054;
3.江苏省地震局, 江苏南京 210014

收稿日期:2021-01-27 修回日期:2021-03-02 发布日期:2021-08-06
作者简介:王勤彩(1966-), 女, 河北藁城人, 研究员, 主要从事地震学研究。
基金资助:
中国地震局地震预测研究所基本科研业务费专项(2020IEF0602); 中国地震局三结合课题(3JH-202001030)

The Earthquake Fault and Seismogenic Mechanism of the Yutian M_S6.4 Earthquake in Xinjiang, China in 2020

WANG Qin-cai¹, LI Jun², ZHANG Jin-chuan³

1. Institute of earthquake forcasting, CEA, Beijing 100036, China;
2. The Second Monitoring and Application Center, CEA, Xi’an 710054, China;
3. Earthquake Administration of Jiangsu Province, Nanjing 210014, China

Received:2021-01-27 Revised:2021-03-02 Published:2021-08-06

摘要/Abstract

摘要： 利用2020年6月26日于田M_S6.4地震序列的震相和波形数据, 对地震序列进行重定位并反演了中强地震的震源机制解, 结合2008年至今的全球矩心矩张量解数据, 反演了西昆仑块体和柴达木—祁连块体间边界地区的应力场。综合分析研究结果发现: 2020年6月26日于田M_S6.4地震序列的发震断层为走向SSW, 倾向NWW的正断层, 地震的发生可能与琼木孜塔格峰山前展布的正断层破裂有关; 西昆仑块体和柴达木—祁连块体之间的边界地区属于东西向拉张应力模式, 支持青藏高原北部大型走滑断裂所圈定的柴达木—祁连块体的东向运动模型。

关键词: 发震断层, 孕震机制, 2020年新疆于田M_S6.4地震

Abstract: By the seismic phase and waveform data of the Yutian M_S6.4 earthquake sequence occurred on June 26th, 2020, earthquakes are relocated and the focal mechanism solutions of moderate and strong earthquakes are inversed. Using the Global Centroid-Moment-Tensor (GCMT) data from 2008 to present, the stress field in the boundary area between the West Kunlun block and the Qaidam-Qilian block is inversed. The results show that the seismogenic fault of Yutian M_S6.4 earthquake sequence on June 26, 2020 is a strike-SSW, dipping NWW normal fault, and the occurrence of M_S6.4 earthquake may be related to the rupture of normal fault in front of the Ulugh Muztagh mountain. The boundary area between the West Kunlun block and the Qaidamu-Qilian block is in the consistent status with the east-west tensile stress model, which supports the eastward movement model that the Qaidamu-Qilian block delineated by the large strike-slip fault in the northern part of the Qinghai-Tibet Plateau.

Key words: Earthquake fault, Seismogenic mechanism, The Yutian M_S6.4 earthquake in Xinjiang in 2020

中图分类号:

P315.7

王勤彩, 李君, 张金川. 2020年新疆于田M_S6.4地震发震断层及孕震机制研究[J]. 地震, 2021, 41(2): 92-101.

WANG Qin-cai, LI Jun, ZHANG Jin-chuan. The Earthquake Fault and Seismogenic Mechanism of the Yutian M_S6.4 Earthquake in Xinjiang, China in 2020[J]. EARTHQUAKE, 2021, 41(2): 92-101.

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2020年新疆于田M_S6.4地震发震断层及孕震机制研究

The Earthquake Fault and Seismogenic Mechanism of the Yutian M_S6.4 Earthquake in Xinjiang, China in 2020

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2020年新疆于田MS6.4地震发震断层及孕震机制研究

The Earthquake Fault and Seismogenic Mechanism of the Yutian MS6.4 Earthquake in Xinjiang, China in 2020

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2020年新疆于田M_S6.4地震发震断层及孕震机制研究

The Earthquake Fault and Seismogenic Mechanism of the Yutian M_S6.4 Earthquake in Xinjiang, China in 2020