气候变化领域集成服务门户(CCPortal): Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet

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DOI	10.1029/2020JB019583
	Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet
	Deng Y.; Peng Z.; Liu-Zeng J.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Repeating earthquakes have been found at many faults around the world. The Haiyuan fault is a major left-lateral strike-slip fault along the northeastern boundary of the Tibetan Plateau. Two great earthquakes (1920 Haiyuan and 1927 Gulang) have occurred on and round this fault system, but the section between the ruptures of the two earthquakes, also known as the Tianzhu seismic gap, remains unbroken. Shallow creep has been observed from geodetic data at the Laohushan section of the Haiyuan fault near the eastern end of the seismic gap. However, the driving mechanism and depth extent of shallow creep are not clear. Here we conduct a systematic search for repeating earthquakes in northeastern Tibet based on seismic data recorded by permanent stations in 10 years (2009–2018). Based on waveform cross-correlations, we find several repeating earthquake clusters at the Laohushan section. This is consistent with the shallow creep inferred from the geodetic data, indicating repeating earthquakes can be driven by nearby aseismic slip. Approximately 300 repeaters were found within clusters of intense seismicity near the rupture zones of the 1927 M8.0 Gulang and 2016 M6.4 Menyuan earthquakes. Relocation of events in the cluster near the Gulang earthquake delineates two possible unmapped faults orthogonal to the Haiyuan fault. In addition, we also identify several repeating earthquakes generated by mining activities with different waveforms and occurrence patterns. Our study suggests that repeating earthquakes around the Haiyuan fault are likely driven by long-term postseismic relaxation process associated with the 1920 Haiyuan and 1927 Gulang earthquakes. ©2020. 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/187773
作者单位	State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Institute of Surface-Earth System Science, Tianjin University, Tianjin, China
推荐引用方式 GB/T 7714	Deng Y.,Peng Z.,Liu-Zeng J.. Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet[J],2020,125(7).
APA	Deng Y.,Peng Z.,&Liu-Zeng J..(2020).Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Deng Y.,et al."Systematic Search for Repeating Earthquakes Along the Haiyuan Fault System in Northeastern Tibet".Journal of Geophysical Research: Solid Earth 125.7(2020).