HR: 1340h
AN: T33C-1489    [Abstracts]
TI: A Lateral Tensile Fracturing Model for Listric Fault
AU: * Qiu, Z
EM: qzhbh@163.com
AF: Institute of Crustal Dynamics, China Earthquake Administration, POB 2855, Xisanqi, Haidian District, Beijing, 100085, China
AB: The new discovery of a major seismic fault of the great 1976 Tangshan earthquake suggests a lateral tensile fracturing process at the seismic source. The fault is in listric shape but can not be explained with the prevailing model of listric fault. A double-couple of forces without moment is demonstrated to be applicable to simulate the source mechanism. Based on fracture mechanics, laboratory experiments as well as numerical simulations, the model is against the assumption of stick-slip on existing fault as the cause of the earthquake but not in conflict with seismological observations. Global statistics of CMT solutions of great earthquakes raises significant support to the idea that lateral tensile fracturing might account for not only the Tangshan earthquake but also others.
DE: 8107 Continental neotectonics (8002)
DE: 8118 Dynamics and mechanics of faulting (8004)
DE: 8122 Dynamics: gravity and tectonics
DE: 8123 Dynamics: seismotectonics
DE: 8168 Stresses: general
SC: Tectonophysics [T]
MN: 2007 Fall Meeting