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Article |
Center for Earthquake Research and Information
University of Memphis
Memphis, Tennessee 38152
bodin{at}ceri.memphis.edu
We present and discuss the spatial distribution of more than 1000
aftershocks of the largest continental intraplate earthquake to occur during
the modern seismological period. The data were recorded on a network of eight
portable digital seismographs deployed for 3 weeks starting 17 days after the
mainshock. We have calculated high-quality single-event locations, based on a
1D velocity model determined for the region for earthquakes with magnitudes
between 
2 and 5. Aftershock locations reveal activity concentrated on a
nearly east-striking, south-dipping plane, trapezoidal in outline. The active
zone tapers from about 45 km along strike at the shallow end, which is about 5
km deep, to no more than 25 km long at a depth of 35 km. The total rupture
area was about 1300 km2. We estimate the static stress drop of the
mainshock at 16 ± 2 MPa. Aftershocks extend nearly through the entire
crust, with concentrations in the lower crust at about 26 km and in the upper
crust at about 10 km. The fault that ruptured was not mapped at the surface
and not known to have been active prior to the 2001 earthquake. The aftershock
data are consistent with the Bhuj earthquake resulting from reactivation in
contraction of a fault formed under extension within a failed rift.
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