HR: 1330h
AN: S52F-0179    [PDF]
TI: Spatial Variation of Short-Term M4+ Earthquake Clusters in Southern California
AU: * Ebel, J E
EM: ebel@bc.edu
AF: Weston Observatory Boston College, 381 Concord Rd., Weston, MA 92493 United States
AU: Kafka, A L
EM: kafka@bc.edu
AF: Weston Observatory Boston College, 381 Concord Rd., Weston, MA 92493 United States
AB: The M4+ seismicity in Southern California from 1932 to 2000 (declustered of foreshocks and aftershocks) is temporally clustered over time periods of a few days at a rate that is greater than expected from a Poisson process. An analysis of this same data set was carried out to search for those areas where M4+ earthquakes are most often followed by another M4+ earthquake in Southern California, as well as those areas where M4+ earthquakes most often take place within 5 days after another M4+ earthquake somewhere in Southern California. Places where M4+ earthquakes are most often followed by another M4+ earthquake somewhere in Southern California include: the northern San Jacinto fault, the vicinity of the Newport-Inglewood fault, the Landers area, the area of the 1952 Kern County earthquake, the Bishop area, and the central San Andreas Fault. All of these areas experienced strong earthquakes during the twentieth century. Those areas where M4+ earthquake most frequently follow within 5 days of another M4+ earthquake in Southern California include the central San Jacinto fault, the San Gabriel Mountains, the Santa Barbara area, and the Lake Isabella area. It is noteworthy that M4+ earthquakes in the transverse ranges of Southern California are seldom followed within 5 days by another M4+ earthquake in Southern California, but this east-west trending compressional zone is more likely to experience an M4+ earthquake within 5 days after another M4+ event in Southern California.
DE: 7223 Seismic hazard assessment and prediction
DE: 7230 Seismicity and seismotectonics
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: 2003 Fall Meeting