气候变化领域集成服务门户(CCPortal): Aseismic Deformation During the 2014 Mw 5.2 Karonga Earthquake; Malawi; From Satellite Interferometry and Earthquake Source Mechanisms

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DOI	10.1029/2020GL090930
	Aseismic Deformation During the 2014 Mw 5.2 Karonga Earthquake; Malawi; From Satellite Interferometry and Earthquake Source Mechanisms
	Zheng W.; Oliva S.J.; Ebinger C.; Pritchard M.E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Aseismic deformation has been suggested as a mechanism to release the accumulated strain in rifts. However, the fraction and the spatial distribution of the aseismic strain are poorly constrained during amagmatic episodes. Using Sentinel-1 interferograms, we identify the surface deformation associated with the 2014 Mw5.2 Karonga earthquake, Malawi, and perform inversions for fault geometry. We also analyze aftershocks and find a variety of source mechanisms within short timescales. A significant discrepancy in the earthquake depth determined by geodesy (3–6 km) and seismology (11–13 km) exists, although both methods indicate Mw5.2. We propose that the surface deformation is caused by aseismic slip from a shallow depth. This vertical partitioning from seismic to aseismic strain is accommodated by intersecting dilatational faults in the shallow upper crust and sedimentary basin, highlighting the importance of considering aseismic deformation in active tectonics and time-averaged strain patterns, even in rifts with little volcanism. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Deformation; Earthquakes; Interferometry; Accumulated strain; Active tectonics; Earthquake source; Satellite interferometry; Sedimentary basin; Source mechanisms; Surface deformation; Vertical partitioning; Faulting; deformation mechanism; earthquake event; interferometry; satellite altimetry; seismology; seismotectonics; slip rate; spatial distribution; upper crust; Karonga; Malawi
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169376
作者单位	Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Department of Earth and Environmental Sciences, Tulane University of Louisiana, New Orleans, LA, United States; Now at Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
推荐引用方式 GB/T 7714	Zheng W.,Oliva S.J.,Ebinger C.,et al. Aseismic Deformation During the 2014 Mw 5.2 Karonga Earthquake; Malawi; From Satellite Interferometry and Earthquake Source Mechanisms[J],2020,47(22).
APA	Zheng W.,Oliva S.J.,Ebinger C.,&Pritchard M.E..(2020).Aseismic Deformation During the 2014 Mw 5.2 Karonga Earthquake; Malawi; From Satellite Interferometry and Earthquake Source Mechanisms.Geophysical Research Letters,47(22).
MLA	Zheng W.,et al."Aseismic Deformation During the 2014 Mw 5.2 Karonga Earthquake; Malawi; From Satellite Interferometry and Earthquake Source Mechanisms".Geophysical Research Letters 47.22(2020).