The 2010 MW 6.8 Yushu (Qinghai, China) earthquake: constraints provided by InSAR and body wave seismology

Li, Z., Elliott, J.R., Feng, W., Jackson, J.A., Parsons, B.E. and Walters, R.J. (2011) The 2010 MW 6.8 Yushu (Qinghai, China) earthquake: constraints provided by InSAR and body wave seismology. Journal of Geophysical Research, 116(B10), B10302. (doi: 10.1029/2011JB008358)

Abstract

By combining observations from satellite radar, body wave seismology and optical imagery, we have determined the fault segmentation and sequence of ruptures for the 2010 Mw 6.8 Yushu (China) earthquake. We have mapped the fault trace using displacements from SAR image matching, interferometric phase and coherence, and 2.5 m SPOT-5 satellite images. Modeling the event as an elastic dislocation with three segments fitted to the fault trace suggests that the southeast and northwest segments are near vertical, with the central segment dipping 70° to the southwest; slip occurs mainly in the upper 10 km, with a maximum slip of 1.5 m at a depth of 4 km on the southeastern segment. The maximum slip in the top 1 km (i.e., near surface) is up to 1.2 m, and inferred locations of significant surface rupture are consistent with displacements from SAR image matching and field observations. The radar interferograms show rupture over a distance of almost 80 km, much larger than initial seismological and field estimates of the length of the fault. Part of this difference can be attributed to slip on the northwestern segment of the fault being due to an Mw 6.1 aftershock two hours after the main event. The remaining difference can be explained by a non-uniform slip distribution with much of the moment release occurring at depths of less than 10 km. The rupture on the central and southeastern segments of the fault in the main shock propagated at a speed of 2.5 km/s southeastward toward the town of Yushu located at the end of this segment, accounting for the considerable building damage. Strain accumulation since the last earthquake on the fault segment beyond Yushu is equivalent to an Mw 6.5 earthquake.

• Item Type: Articles
• Keywords: InSAR; Yushu Earthquake; earthquake source parameters; geodetic inversion; seismic hazard
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Li, Dr Zhenhong
• Authors: Li, Z., Elliott, J.R., Feng, W., Jackson, J.A., Parsons, B.E., and Walters, R.J.
• Subjects: G Geography. Anthropology. Recreation > GB Physical geography; G Geography. Anthropology. Recreation > GE Environmental Sciences; Q Science > Q Science (General); Q Science > QC Physics
• College/School: College of Science and Engineering > School of Geographical and Earth Sciences > Earth Sciences
• Journal Name: Journal of Geophysical Research
• ISSN: 0148-0227
• Published Online: 07 July 2011
• Copyright Holders: Copyright © 2011 American Geophysical Union
• First Published: First published in Journal of Geophysical Research 116.
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
51303	1	GAS: Generic Atmosphere Solutions for radar measurements	Zhenhong Li	Natural Environment Research Council (NERC)	NE/H001085/1	School of Geographical and Earth Sciences