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DTSTAMP:20121026T163000Z
UID:1346437779180@events.msu.edu
CATEGORIES:Conferences / Seminars / Lectures
DTSTART:20121026T163000Z
DTEND:20121026T173000Z
SUMMARY:Oct. 26 - Geological Sciences Seminar
DESCRIPTION:
 Dr. Eric Hetland, University of Michigan\n
 "The 
 2008 Mw 7.9 Wenchuan, China, Earthquake: InSAR, 
 Coseismic Slip, and the Accumulated Stresses"\n
 \n
 Abstract: 
 \n
 \n
 The 2008 Mw 7.9 Wenchuan, 
 China, Earthquake: InSAR, Coseismic Slip, 
 and the Accumulated Stresses\n
 \n
 E.A. Hetland 
 (1), L. Medina Luna (1), and G. Feng(2)\n
 \n
 1: 
 Dept. of Earth and Env. Sciences, University 
 of Michigan, Ann Arbor, MI, USA.\n
 2: King Abdllah 
 University of Science and Technology, Thuwal, 
 Kingdom of Saudi ArabiaThe Mw 7.9 Wenchuan 
 earthquake occurred on 12 May 2008, along 
 the middle segment of the Longmen Shan fault 
 zone (LMSfz), marking the eastern margin of 
 the Tibetan plateau and the Sichuan basin in 
 China. The Wenchuan earthquake was devastating 
 to Sichuan Province, with about 70-86 thousand 
 dead and wide-spread damage. The LMSfz is 
 characterized by significant topographic relief 
 indicating that deformation is active, yet 
 prior to the 2008 earthquake this area was 
 fairly seismically quiet and GPS revealed little 
 strain accumulation along the faults. We 
 use ALOS/PALSAR imagery to produce interferometric 
 synthetic aperture radar (InSAR) interferograms 
 of coseismic deformation. We find that 
 many of the radar acquisitions associated 
 with the Wenchuan earthquake were strongly affected 
 by ionospheric disturbances coincident 
 with the rupture. Using InSAR interferograms, 
 as well as GPS data, we investigate the coseismic 
 fault slip that occurred during the 2008 
 earthquake. The Wenchuan earthquake was oblique-thrust, 
 but coseismic slip models indicate 
 that the fault slip rake varied during the 
 rupture, with progressively more strike-slip 
 occurring on steeper faults as the rupture 
 propagated from the SW to the NE. We further 
 use geodetic-based inferences of coseismic slip 
 to investigate the stresses in the LMSfz 
 that led to the 2008 earthquake, and the relation 
 of these stresses to stain-accumulation. 
 Our initial analysis does not rely on models 
 of static frictional stability, although we 
 are exploring such models in order to seek further 
 constraints on the stresses responsible 
 for the Wenchuan earthquake.\n\n
 Price: free\n
 Sponsor: MSU Department of Geological Sciences\n
 Sponsor's Homepage: http://glg.msu.edu\n
 Contact name: Heidi Lynde\n
 Contact phone: 517 355-4626\n
 Contact email: lynde@msu.edu\n
LOCATION:145 Natural Science Building
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