Publication Date:
2005
Description:
We show that realistic aftershock sequences with space-time characteristics
compatible with observations are generated by a model consisting of brittle fault
segments separated by creeping zones. The dynamics of the brittle regions is governed by
static/kinetic friction, 3D elastic stress transfer and small to moderate creep
deformation compatible with laboratory experiments. The creeping parts are characterized
by high ongoing creep velocities. These regions store stress during earthquake failures
and then release it in the interseismic periods. The resulting postseismic deformation
leads to aftershock sequences following the modified Omori law. The ratio of creep
coefficients in the brittle and creeping sections determines the duration of the
postseismic transients and the exponent p of the modified Omori law.
Keywords:
Aftershocks
;
Omori
;
Creep observations and analysis
;
Friction
;
Rheology
;
Inhomogeneity
;
Earthquake precursor: prediction research
;
Seismicity
;
Zoeller
;
Zoller
;
GRL
;
209
;
Seismology:
;
Earthquake
;
dynamics
;
(1242)
;
7223
;
Earthquake
;
interaction,
;
forecasting,
;
and
;
prediction
;
(1217,
;
1242)
;
7230
;
Seismicity
;
and
;
tectonics
;
(1207,
;
1217,
;
1240,
;
1242)
;
7260
;
Theory
;
7290
;
Computational
;
seismology
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