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Bulletin of the Seismological Society of America, Vol. 94, No. 4, pp. 11731194, August 2004 The 14 November 2001 Kokoxili (Kunlunshan), Tibet, Earthquake

Summary: 1173
Bulletin of the Seismological Society of America, Vol. 94, No. 4, pp. 1173­1194, August 2004
The 14 November 2001 Kokoxili (Kunlunshan), Tibet, Earthquake:
Rupture Transfer through a Large Extensional Step-Over
by Michael Antolik, Rachel E. Abercrombie, and Go¨ran Ekstro¨m
Abstract The 14 November 2001 Kokoxili, Tibet, earthquake (Mw 7.8) ruptured
400 km of the western Kunlun fault in northern Tibet. We apply two inversion
methods to P and SH waves recorded by the Global Seismographic Network to
recover the spatial and temporal history of the rupture process. The observed surface
rupture consists of two strike-slip segments, offset by an extensional step-over. Little
surface rupture was observed in the graben system in this step-over, which is ap-
proximately 45 km long and over 10 km wide. Our results imply that the rupture did
not jump this large gap, but that the rupture was continuous through the graben. The
earthquake began with a small strike-slip subevent, presumably along the western-
most of the two segments. This was followed 5 sec later by a subevent of about the
same magnitude but having an oblique mechanism with a large normal-faulting com-
ponent. The likely location for this subevent is within the graben. This oblique-slip
event probably enabled transfer of the rupture onto the main Kunlun fault. The main
moment release began 18 sec after rupture initiation and propagated over 350 km


Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University


Collections: Geosciences