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Deformation following the 1994 Northridge earthquake (M=6.7), southern California

Geophysical Research Letters

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Abstract

Following the 1994 MW=6.7 Northridge earthquake, a 65-km-long, north-south array of 11 geodetic monuments was established across the rupture. The array was surveyed with GPS ten times in the 4.25 yr after the earthquake. Although there is evidence for modest nonlinear postseismic relaxation in the first few weeks after the Northridge earthquake, the deformation in the subsequent four years can be adequately described by constant station velocities. The observed S70??E velocity components are consistent with the deformation expected from steady strain accumulation on the San Andreas fault. The N20??E velocity components indicate that the southern Northridge fault block is moving almost as a unit N20??E with repect to the northern fault block, the motion being accommodated by a zone of convergence (width 20 km) at the north end of the Northridge rupture.Following the 1994 Mw=6.7 Northridge earthquake, a 65-km-long, north-south array of 11 geodetic monuments was established across the rupture. The array was surveyed with GPS ten times in the 4.25 yr after the earthquake. Although there is evidence for modest nonlinear postseismic relaxation in the first few weeks after the Northridge earthquake, the deformation in the subsequent four years can be adequately described by constant station velocities. The observed S70??E velocity components are consistent with the deformation expected from steady strain accumulation on the San Andreas fault. The N20??E velocity components indicate that the southern Northridge fault block is moving almost as a unit N20??E with respect to the northern fault block, the motion being accommodated by a zone of convergence (width 20 km) at the north end of the Northridge rupture.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deformation following the 1994 Northridge earthquake (M=6.7), southern California
Series title:
Geophysical Research Letters
Volume
25
Issue:
14
Year Published:
1998
Language:
English
Publisher:
American Geophysical Union
Publisher location:
Washington, DC, United States
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
2725
Last page:
2728
Number of Pages:
4