气候变化领域集成服务门户(CCPortal): Fault Geometry and Slip Distribution of the 2013 Mw 7.7 Balochistan Earthquake From Inversions of SAR and Optical Data

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DOI	10.1029/2019JB018380
	Fault Geometry and Slip Distribution of the 2013 Mw 7.7 Balochistan Earthquake From Inversions of SAR and Optical Data
	Lauer B.; Grandin R.; Klinger Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	The 2013 Mw 7.7 Balochistan earthquake ruptured the Hoshab fault (Pakistan) over 200 km. It was dominated by left-lateral slip, with a secondary reverse component. By combining optical (SPOT 5 and Landsat 8) and radar satellite data (RADARSAT-2 and TerraSAR-X ScanSAR), we derive the 3-D coseismic displacement field and the slip distribution. Our modeling strategy involves two successive inversions allowing to explore first the fault geometry and then slip distribution. Following a statistical analysis of the coseismic surface trace, the fault is discretized into 16 segments. To determine the dip angle and down-dip width of the segments, we then perform a non-linear elastic inversion of the geodetic data set. Using output of this model, we prescribe the fault geometry and linearly invert for slip at depth with refined discretization. Results show a decrease of the fault dip, reaching 50° in the central part of the fault that structurally connects the two sub-vertical terminations dipping at >70°. The distribution of strike-slip forms a shallow continuous patch (0–8 km) that peaks at 12.7 m of slip near the epicenter. Reverse slip is distributed on several patches and becomes shallower near the southern termination, where it peaks at 5.7 m. Our model shows an absence of shallow slip deficit (SSD), as for other Mw 7.5 + strike-slip earthquakes elsewhere, hence suggesting that SSD is only found for lesser magnitude earthquakes. We speculate that moment magnitude is a key element in the occurrence of SSD. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Balochistan earthquake; earthquake rupture modeling; earthquake source processes; InSAR; optical data; shallow slip deficit
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/187757
作者单位	Institut de Physique du Globe de Paris, CNRS, Université de Paris, Paris, France
推荐引用方式 GB/T 7714	Lauer B.,Grandin R.,Klinger Y.. Fault Geometry and Slip Distribution of the 2013 Mw 7.7 Balochistan Earthquake From Inversions of SAR and Optical Data[J],2020,125(7).
APA	Lauer B.,Grandin R.,&Klinger Y..(2020).Fault Geometry and Slip Distribution of the 2013 Mw 7.7 Balochistan Earthquake From Inversions of SAR and Optical Data.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Lauer B.,et al."Fault Geometry and Slip Distribution of the 2013 Mw 7.7 Balochistan Earthquake From Inversions of SAR and Optical Data".Journal of Geophysical Research: Solid Earth 125.7(2020).