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Sensors 2015, 15(7), 16786-16803; doi:10.3390/s150716786

A New Perspective on Fault Geometry and Slip Distribution of the 2009 Dachaidan Mw 6.3 Earthquake from InSAR Observations

1,2,3,* , 1,2,3
,
1,2,3
and
1,2
1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
3
Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 18 May 2015 / Revised: 24 June 2015 / Accepted: 8 July 2015 / Published: 10 July 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [1349 KB, uploaded 14 July 2015]   |  

Abstract

On 28 August 2009, the northern margin of the Qaidam basin in the Tibet Plateau was ruptured by an Mw 6.3 earthquake. This study utilizes the Envisat ASAR images from descending Track 319 and ascending Track 455 for capturing the coseismic deformation resulting from this event, indicating that the earthquake fault rupture does not reach to the earth’s surface. We then propose a four-segmented fault model to investigate the coseismic deformation by determining the fault parameters, followed by inverting slip distribution. The preferred fault model shows that the rupture depths for all four fault planes mainly range from 2.0 km to 7.5 km, comparatively shallower than previous results up to ~13 km, and that the slip distribution on the fault plane is complex, exhibiting three slip peaks with a maximum of 2.44 m at a depth between 4.1 km and 4.9 km. The inverted geodetic moment is 3.85 × 1018 Nm (Mw 6.36). The 2009 event may rupture from the northwest to the southeast unilaterally, reaching the maximum at the central segment. View Full-Text
Keywords: InSAR; fault geometry; slip distribution; the 2009 Dachaidan Mw 6.3 earthquake; the Tibet Plateau; rupture propagation InSAR; fault geometry; slip distribution; the 2009 Dachaidan Mw 6.3 earthquake; the Tibet Plateau; rupture propagation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, Y.; Xu, C.; Wen, Y.; Fok, H.S. A New Perspective on Fault Geometry and Slip Distribution of the 2009 Dachaidan Mw 6.3 Earthquake from InSAR Observations. Sensors 2015, 15, 16786-16803.

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