巴颜喀拉块体东北缘GPS应变率空间分布特征及其与2017年九寨沟MS7.0地震的关系

Abstract

Abstract: The northeast margin of Balyan Har block is a region of strong tectonic deformation and active seismicity. The 2017 Jiuzhaigou M_S7.0 earthquake occurred in this zone. We use the method of multi-scale sphere wavelet to estimate GPS strain filed and analyse strain field in the northeast margin of Balyan Har block from 2009 to 2017. The advantage of this method is that the GPS strain rate field can be decomposed according to different spatial scales, and can give the strain rate field of different space scales. The results show that the before the 2017 Jiuzhaigou earthquake, the strain accumulation near the epicenter zone has been significant. Strike-slip rate in the extension of the north Huya fault is 3.0 mm/a, tensile rate is 3.1 mm/a. It indicates that the fault is dominated by left-lateral slip accompanied by tensile, which is consistent with the focal mechanism of the Jiuzhaigou earthquake. Besides, in the junction of Minxian and Zhangxian, Lixian, Wenchuan and Qingchuan areas, There also exists large principal strain rate, the dilatation rate, and maximum shear strain rate, which may relate with the 2013 Minxian-Zhangxian M_S6.6, the 2008 Wenchuan M_S8.0 and the 2014 Lixian M_S4.8, Qingchuan M_S4.8 Earthquakes.

Key words: GPS observations, Strain rate field, The 2017 Jiuzhaigou M_S7.0, The northeast margin of Bayan Har block

CLC Number:

P315.7

LI Cheng-tao, SU Xiao-ning, MENG Guo-jie. Heterogeneous Strain Rate Field in the Northeast Margin of Bayan Har Block from GPS Observations and its Relationship with the 2017 Jiuzhaigou M_S7.0 Earthquake[J]. EARTHQUAKE, 2018, 38(2): 37-50.

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Heterogeneous Strain Rate Field in the Northeast Margin of Bayan Har Block from GPS Observations and its Relationship with the 2017 Jiuzhaigou M_S7.0 Earthquake

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Heterogeneous Strain Rate Field in the Northeast Margin of Bayan Har Block from GPS Observations and its Relationship with the 2017 Jiuzhaigou MS7.0 Earthquake

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Heterogeneous Strain Rate Field in the Northeast Margin of Bayan Har Block from GPS Observations and its Relationship with the 2017 Jiuzhaigou M_S7.0 Earthquake