Earthquake Monitoring in Southern California for Seventy-Seven Years (1932-2008)

摘要: The Southern California Seismic Network (SCSN) has produced the SCSN earthquake catalog from 1932 to present, a period of more than 77 yrs. This consists phase picks, hypocenters, and magnitudes. We present history evolution catalog, facilitate user understanding its limitations strengths. Hypocenters magnitudes have improved in quality with time, as number stations increased gradually 7 ~400 data acquisition measuring procedures become sophisticated. magnitude completeness (M_c) network M_c ~3.25 early years ~1.8 at or better most densely instrumented areas. Mainshock–aftershock swarm sequences scattered individual background earthquakes characterize seismicity 470,000 events. frequency-size distribution an average b-value ~1.0, M≥6.0 events occurring approximately every 3 three largest recorded were 1952 M_w 7.5 Kern County, 1992 7.3 Landers, 1999 7.1 Hector Mine sequences, damaging 1933 6.4 Long Beach, 1971 6.7 San Fernando, 1994 Northridge earthquakes. All these ruptured slow-slipping faults, located away main plate boundary fault, Andreas fault. Their aftershock constitute about third catalog. fast slipping southern fault is relatively quiet microseismic level not had M>6 since 1932. In contrast, slower Jacinto highest seismicity, including several Thus, spatial temporal patterns exhibit complex relationship tectonic crustal deformation.