thumbnail

The seismic cycle in southern California: Precursor or response?

Geophysical Research Letters

By:
,

Links

  • The Publications Warehouse does not have links to digital versions of this publication at this time

Abstract

The seismicity rate (M???3.0) in southern California shows two cycles with periods of high activity (90 events/year), from 1945-1952 and 1969-1992, and lower activity (60-70 events /year) from 1952-1969 and 1992-present. Abrupt drops in the seismicity rate occur after the 1952 Kern County (M7.5) and the 1992 Landers (M7.3) earthquakes. The sudden increase in 1969 does not coincide with any major event but approximates the time needed to reaccumulate the seismic moment released in the 1952 earthquake. This temporal correlation with the preceding earthquake suggests that the seismic cycle (lower seismicity after a major earthquake and higher seismicity before the next major earthquake) should be interpreted as a response to the first earthquake rather than a precursor to the second. Southern California is now at a rate of seismicity as low as it experienced in the 1950s and 1960s.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The seismic cycle in southern California: Precursor or response?
Series title:
Geophysical Research Letters
Volume
24
Issue:
4
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
469
Last page:
472
Number of Pages:
4