气候变化领域集成服务门户(CCPortal): Aftershocks and Background Seismicity in Tangshan and the Rest of North China

CCPortal

DOI	10.1029/2020JB021395
	Aftershocks and Background Seismicity in Tangshan and the Rest of North China
	Chen Y.; Liu M.; Wang H.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	The 1976 Great Tangshan earthquake (Ms 7.8) in North China was the deadliest earthquake in the past century. Understandably, a sequence of moderate (M ≥ 4.5) earthquakes in recent years in the Tangshan region, including the Ms 5.1 earthquake on July 12, 2020, raised much social concern and scientific debate about the seismic risk near Tangshan and in North China, a region of active intraplate seismicity. Are these recent events aftershocks of the 1976 Great Tangshan earthquake or are they background earthquakes? Here, we separated clustered events (i.e., aftershocks) from background earthquakes in Tangshan and the entire North China using the nearest-neighbor (NN) method, and estimated the duration of the 1976 Tangshan aftershock sequence by fitting the decay of seismicity with respect to the background seismicity. Our results suggest that the recent moderate earthquakes are likely aftershocks. This is consistent with their occurrences in places of increased Coulomb failure stress due to the 1976 Great Tangshan earthquake. The estimated aftershock duration is around 65–100 years for the 1976 Great Tangshan earthquake. The background seismicity in North China, obtained by removing aftershocks identified by the NN method, is relatively stationary in space but varies in time, decreasing slightly in recent years. Major active tectonic zones, including the Shanxi Rift and the Zhangjiakou-Penglai fault system, show correlation between relatively high background seismicity, high geodetic strain rates, and large historic earthquakes. Such correlation, however, is poor within the North China Plain, highlighting the complexity of intraplate earthquakes. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	aftershock duration; intraplate earthquakes; North China; Tangshan earthquake
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/187105
作者单位	Department of Geological Sciences, University of Missouri, Columbia, MO, United States; Institute of Earthquake Forecasting, China Earthquake Administration, Beijing, China
推荐引用方式 GB/T 7714	Chen Y.,Liu M.,Wang H.. Aftershocks and Background Seismicity in Tangshan and the Rest of North China[J],2021,126(5).
APA	Chen Y.,Liu M.,&Wang H..(2021).Aftershocks and Background Seismicity in Tangshan and the Rest of North China.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Chen Y.,et al."Aftershocks and Background Seismicity in Tangshan and the Rest of North China".Journal of Geophysical Research: Solid Earth 126.5(2021).