干旱区生态环境知识资源中心(Arid): 25-Second Determination of 2019 M-w 7.1 Ridgecrest Earthquake Coseismic Deformation

Arid

DOI	10.1785/0120200084
	25-Second Determination of 2019 M-w 7.1 Ridgecrest Earthquake Coseismic Deformation
	Melbourne, Timothy, I; Szeliga, Walter M.; Santillan, V. Marcelo; Scrivner, Craig W.
通讯作者	Melbourne, TI
来源期刊	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
ISSN	0037-1106
EISSN	1943-3573
出版年	2020
卷号	110 期号:4 页码:1680-1687
英文摘要	We have developed a global earthquake monitoring system based on low-latency measurements from more than 1000 existing Global Navigational Satellite System (GNSS) receivers, of which nine captured the 2019 M-w 6.4 Ridgecrest, California, foreshock and M-w 7.1 mainshock earthquakes. For the foreshock, coseismic offsets of up to 10 cm are resolvable on one station closest to the fault, but did not trigger automatic offset detection. For the mainshock, GNSS monitoring determined its coseismic deformation of up to 70 cm on nine nearby stations within 25 s of event nucleation. These 25 s comprise the fault rupture duration itself (roughly 10 s of peak moment release), another 10 s for seismic waves and displacement to propagate to nearby GNSS stations, and a few additional seconds for surface waves and other crustal reverberations to dissipate sufficiently such that coseismic offset estimation filters could reconverge. Latency between data acquisition in the Mojave Desert and positioning in Washington State averaged 1.4 s, a small fraction of the fault rupture time itself. GNSS position waveforms for the two closest stations that show the largest dynamic and static displacements agree well with postprocessed time series. Mainshock coseismic ground deformation estimated within 25 s of origin time also agrees well with, but is similar to 10% smaller than, deformation estimated using 48 hr observation windows, which may reflect rapid postseismic fault creep or the cumulative effect of nearly 1000 aftershocks in the 48 hr following the mainshock. GNSS position waveform shapes, which comprise a superposition of dynamic and static displacements, are well modeled by frequency-wavenumber synthetics for the Hadley-Kanamori 1D crustal structure model and the U.S. Geological Survey finite-rupture distribution and timing. These results show that GNSS seismic monitoring performed as designed and offers a new means of rapidly characterizing large earthquakes globally.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000558543900019
WOS关键词	RUPTURE ; CALIFORNIA ; FINITE ; GNSS
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325560
作者单位	[Melbourne, Timothy, I; Szeliga, Walter M.; Santillan, V. Marcelo; Scrivner, Craig W.] Cent Washington Univ, Pacific Northwest Geodet Array, Dept Geol Sci, Ellensburg, WA 98926 USA
推荐引用方式 GB/T 7714	Melbourne, Timothy, I,Szeliga, Walter M.,Santillan, V. Marcelo,et al. 25-Second Determination of 2019 M-w 7.1 Ridgecrest Earthquake Coseismic Deformation[J],2020,110(4):1680-1687.
APA	Melbourne, Timothy, I,Szeliga, Walter M.,Santillan, V. Marcelo,&Scrivner, Craig W..(2020).25-Second Determination of 2019 M-w 7.1 Ridgecrest Earthquake Coseismic Deformation.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,110(4),1680-1687.
MLA	Melbourne, Timothy, I,et al."25-Second Determination of 2019 M-w 7.1 Ridgecrest Earthquake Coseismic Deformation".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 110.4(2020):1680-1687.