气候变化领域集成服务门户(CCPortal): Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods

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DOI	10.1029/2019JB019244
	Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods
	Ou Q.; Kulikova G.; Yu J.; Elliott A.; Parsons B.; Walker R.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Reported magnitudes ranging between 7.8 and 8.7 highlight a confusion about the true size of the 1920 Haiyuan earthquake, the largest earthquake recorded in the northeast Tibetan Plateau. We compiled a global data set of previously unlooked-at historical seismograms and performed modern computational analyses on the digitized seismic records. We found the epicenter to be near Haiyuan town and obtained a moment magnitude of MW=7.9±0.2. Following traditional approaches, we obtained mB=7.9±0.3 with data from 21 stations and MS(20)=8.1±0.2 with data from three stations. Geomorphologically, we mapped the surface rupture and horizontal offsets on high-resolution Pleiades satellite and drone imagery that covered the entire western and middle sections of the 1920 Haiyuan earthquake rupture and compiled offsets reported on the eastern section from field measurements in the 1980s. Careful discrimination between single-event and cumulative offsets suggests average horizontal slips of 3.0±1.0 m on the western section, 4.5±1.5 m on the middle section, and 3.5±0.5 m on the eastern section, indicating a total moment magnitude of MW=7.8±0.1. Thus, the seismological and geomorphological results agree within the uncertainties, a weighted average giving a moment magnitude of MW=7.9±0.2 for the 1920 Haiyuan earthquake. It is likely that earthquake magnitudes based on the historical M were systematically overestimated. ©2020. The Authors.
英文关键词	1920 Haiyuan Earthquake; China; epicenter; historical seismogram; magnitude; Pleiades satellite imagery
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/187654
作者单位	COMET, Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Institute of Geosciences, University of Potsdam, Potsdam, Germany; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China; Now at the U.S. Geological Survey Earthquake Science Center, Moffett Field, CA, United States
推荐引用方式 GB/T 7714	Ou Q.,Kulikova G.,Yu J.,et al. Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods[J],2020,125(8).
APA	Ou Q.,Kulikova G.,Yu J.,Elliott A.,Parsons B.,&Walker R..(2020).Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Ou Q.,et al."Magnitude of the 1920 Haiyuan Earthquake Reestimated Using Seismological and Geomorphological Methods".Journal of Geophysical Research: Solid Earth 125.8(2020).