Unknown
In:
Geophys. Res. Lett., London, 416 pp., Geological Society, vol. 26, no. 21, pp.
3209-3212, pp. L18607, (ISBN 1-86239-117-3)
Publication Date:
1999
Description:
Viscoelastic relaxation triggers aftershocks. - Deng et al. use a
three-dimensional viscoelastic model to show that postseismic displacements associated
with the 17 January 1994 Northridge, California, earthquake resulted from viscous flow
in the lower crust. Moreover, most of the aftershocks within the rupture zone were set
off by continuous stress loading from the viscous flow. The authors find a high
correlation between aftershocks and positive changes in shear stress related to the
viscoelastic relaxation process. The model matches the temporal decay and spatial
patterns of these aftershocks as shown by the extensive seismic and geodetic
measurements.
Keywords:
Rheology
;
Inelastic
;
Crustal deformation (cf. Earthquake precursor: deformation or strain)
;
Coulomb
;
Earthquake
;
Aftershocks
;
7200
;
5100
;
Stress
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