气候变化领域集成服务门户(CCPortal): Complex Source Behaviors and Spatiotemporal Evolution of Seismicity During the 2015–2016 Earthquake Sequence in Cushing, Oklahoma

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DOI	10.1029/2021JB022168
	Complex Source Behaviors and Spatiotemporal Evolution of Seismicity During the 2015–2016 Earthquake Sequence in Cushing, Oklahoma
	Meng Q.; Ni S.; Peng Z.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	In September and October 2015, three M4+ earthquakes occurred as a sequence along a fault northwest of the Cushing city, Oklahoma, followed by another M5 earthquake in November 2016. While previous studies have shown that moderate-size earthquakes in Oklahoma are likely induced by wastewater injections, it is still not clear what controls the rupture process and spatiotemporal evolutions of seismicity during individual sequences. In this study, we investigated the rupture process of these four M4-5 events in 2015–2016 with finite fault model (FFM) inversions, and computed the static stress changes during this sequence. We found that the rupture processes of four M4-5 earthquakes were very complex, and each of them had several subevents with different rupture directivities. The 2016 M5 earthquake started near the region where three M4+ events initiated, but the majority of the slip occurred a few kilometers away in the northeast direction. In comparison, the 2015 M4.3 event mainly ruptured toward the southwest direction. Due to data limitation and inversion uncertainties, we were unable to constrain the rupture directivities for the other two M4+ events. The foreshocks 3 days before the first M4+ earthquake in 2015 occurred in a region of positive shear stress changes caused by previous earthquakes in 2014–2015 on unmapped faults several kilometers to the south. Our results suggest small-scale heterogeneity in controlling complex seismicity and rupture patterns in the 2015–2016 Cushing sequence, and possible triggering of this sequence by a small stress perturbation on order of a few kilopascals. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	finite fault model; induced earthquakes; injection; Oklahoma; seismicity; stress triggering
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/187077
作者单位	Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States
推荐引用方式 GB/T 7714	Meng Q.,Ni S.,Peng Z.. Complex Source Behaviors and Spatiotemporal Evolution of Seismicity During the 2015–2016 Earthquake Sequence in Cushing, Oklahoma[J],2021,126(6).
APA	Meng Q.,Ni S.,&Peng Z..(2021).Complex Source Behaviors and Spatiotemporal Evolution of Seismicity During the 2015–2016 Earthquake Sequence in Cushing, Oklahoma.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Meng Q.,et al."Complex Source Behaviors and Spatiotemporal Evolution of Seismicity During the 2015–2016 Earthquake Sequence in Cushing, Oklahoma".Journal of Geophysical Research: Solid Earth 126.6(2021).