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MAJOR EARTHQUAKES AND RECENTLY ACTIVE FAULTS by tiw14488

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                                                 MAJOR                                 E ARTHQUAKES AND RECENTLY ACTIVE F AULTS
                                                                                       IN T HE SO UTHERN CALIFORNIA REGION

                                                     ACTIVE                         F AULTS                                                                                                      EARTHQUAKE                                               LO CATIONS

                                   Total length of fault zone that breaks                                                                              1899                                 Approximate epicentral area of earthquakes that
                                   Holocene deposits or that has had                                                                                   M7+                                  occurred 1769-1933. Magnitudes not recorded by
                                   seismic activity                                                                                                                                         instruments prior to 1906 were estimated from
                                                                                                                                                                                            damage reports assigned on intensity VII (Modified
                                   Fault segment with surface rupture                                                                                                                       Mercali scale) or greater; this is roughly equivalent
                                   during an historic earthquake, or with                                                                                                                   to Richter M6.0. 31 moderate earthquakes, 7
                                   a seismic fault creep.                                                                                                                                   major and one great earthquake (1857) were
                                                                                                                                                                                            reported in the 164-year period 1769-1933.
                                   Holocene volcanic activity                                                                                             1952
                                                                                                                                                          M7.7                              Earthquake epicenters since 1933, plotted from
                                   (Amboy, Pisgah, Cerro Prieto and
                                   Salton Buttes)                                                                                                                                           improved instruments. 29 moderate and three
                                                                                                                                                                                            major earthquakes were recorded in the 40-year
                                                                                                                                                                                            period 1933-1973.
Source: SAIC, from Moran et. al. 1973.



Figure F-2. Regional Fault Map

								
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