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MAJOR EARTHQUAKES AND RECENTLY ACTIVE FAULTS
IN THE SOUTHERN CALIFORNIA REGION
EXPLANATION
ACTIVE FAULTS
Total length of fault zone that breaks Holocene deposits k
or that has had seismic activity.
Fault segment with surface rupture during on historic
earthquake; or with, aseismic fault creep.
# Holocene volcanic activity
(Amboy, Pisgah, Cerro Prieto and Salton Buttes)
EARTHQUAKE LOCATIONS
1952-0
M 7.7
Approximale epicentral area of earthquakes that
occurred 1769-1933. Magnitudes not recorded
by instruments prior to 1906 were estimated
from damage reports assigned on Intensify VII
( Modified Mercoli scale) or greater; this is roughly
equivalent to Richter M 6.0. 31 moderote—
earthquakes, 7 major and one great earthquake
(1857) were reported in the 164-yeor period
1769-1933.
Earthquake epicenters since 1933, plotted from
improved instruments. 33 moderate" and Ove.
major ecrthquokes were recorded in the 66 -year
Period r 1933 to 1999
•• Code recommendations by the Structural Engineers Association of California define a great earthquake as one that
has a Richlcr Magnitude of 7% or greater; a major earthquake 7 to 7 % ; a moderate earthquake 6 to 7, r
Compiled by Richard J. Proctor mainly from published and unpublisheddata of the Colilornia Division o/ d4ines and Geology; Calilarn%a Department
a/ Woler Resources Bulletin 116-2 ( 1964); selections from bullelins of the Geological and Seismological Societies of America; from C. E Richter,
Elemealary Seismology ( 1958 ); and the Nolianol A11os, p.66., and from Working Group on California Earthquake Probabilities -SSA Bulletin,V185
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