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City of Santa Ana Emergency Operations Plan <br />Part I Basic Plan <br />in far more death and destruction than a great quake on the San Andreas, because the San Andreas is relatively <br />remote from the urban centers of Southern California. <br />Since seismologists started recording and measuring earthquakes, there have been tens of thousands of recorded <br />earthquakes in Southern California, most with a magnitude below three. In the last 100 years, southern California <br />has experienced over 220 earthquakes of Magnitude 5.0 or larger. No community in Southern California is beyond <br />the reach of a damaging earthquake. The chart below describes notable historical earthquakes that have affected <br />Southern California. <br />Southern California Region Earthquakes with a Magnitude 5.0 or Greater <br />Year <br />Earthquake <br />Fault(s) (if known or named) <br />Magnitude <br />Deaths <br />1769 <br />Los Angeles Basin <br />San Joaquin Hills <br />Est. 5.5+ <br />1800 <br />San Diego Region <br />Est. 6.5+ <br />1812 <br />Wrightwood <br />San Andreas <br />Est. 7.5+ <br />40 <br />1812 <br />Santa Barbara Channel <br />7.1 <br />1857 <br />Great Fort Tejon <br />San Andreas <br />7.9 <br />2 <br />1858 <br />San Bernardino Region <br />Est. 5.5+ <br />1862 <br />San Diego Region <br />Est. 5.5+ <br />1892 <br />San Jacinto or Elsinore <br />Est. 6.5+ <br />1899 <br />Cajon Pass <br />5.7 <br />1899 <br />San Jacinto and Hemet <br />San Jacinto <br />6.5 <br />6 <br />1910 <br />Glen Ivy Hot Springs <br />Elsinore <br />6.0 <br />1918 <br />San Jacinto and Hemet <br />San Jacinto <br />6.8 <br />1 <br />1923 <br />San Bernardino Region <br />San Jacinto <br />6.3 <br />1925 <br />Santa Barbara <br />6.3 <br />13 <br />1933 <br />Great Long Beach <br />Newport -Inglewood <br />6.4 <br />120 <br />1937 <br />San Jacinto <br />San Jacinto <br />6.0 <br />1948 <br />Desert Hot Springs <br />Banning/South Branch San Andreas <br />6.0 <br />1952 <br />Kern County <br />White Wolf <br />7.5 <br />12 <br />1954 <br />San Jacinto <br />Clark <br />6.4 <br />1971 <br />San Fernando -Sylmar <br />San Fernando <br />6.6 <br />65 <br />1987 <br />Whittier Narrows <br />Puente Hills <br />5.9 <br />8 <br />1992 <br />Landers <br />Multiple faults <br />7.3 <br />1 <br />1992 <br />Big Bear <br />6.4 <br />1994 <br />Northridge <br />Northridge <br />6.7 <br />57 <br />1999 <br />Hector Mine <br />Lavic Lake and Bullion Faults <br />7.1 <br />2003 <br />San Simeon <br />6.5 <br />2 <br />2008 <br />Chino Hills <br />Chino <br />5.4 <br />2010 <br />Baja California -Sierra Mayor <br />Multiple faults <br />7.2 <br />2 <br />2014 <br />La Habra <br />5.1 <br />2019 <br />Ridgecrest <br />Eastern California Shear Zone <br />6.4 and 7.1 <br />Source: SCEC, USGS websites <br />The most recent significantly damaging earthquake affecting Southern California was the 1994 Northridge <br />Earthquake. At 4:31 A.M. on Monday, January 17, a moderate -strength but very damaging earthquake with a <br />magnitude of 6.7 struck the San Fernando Valley. In the following days and weeks, thousands of aftershocks <br />occurred, causing additional damage to affected structures. Fifty-seven people were killed and more than 1,500 <br />people seriously injured. <br />For days, thousands of homes and businesses were without electricity, tens of thousands had no gas, and nearly <br />50,000 had little or no water. Approximately 15,000 structures were moderately to severely damaged, which left <br />35 <br />