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City of Santa Ana Emergency Operations Plan <br />Part I Basic Plan <br />San Andreas Fault Zone: The dominant active fault in California, it is the main element of the boundary between <br />the Pacific and North American tectonic plates. The longest and most publicized fault in California, it extends 750 <br />miles from Cape Mendocino in northern California to the Salton Sea in Imperial County, and is approximately 45 <br />miles northeast of Santa Ana. This fault was the source of the 1906 San Francisco earthquake, which resulted in <br />some 700 deaths and millions of dollars in damage. The southern section of this fault is currently of the greatest <br />concern to the scientific community. Geologists can demonstrate that at least eight major earthquakes (M 7.0 and <br />larger) have occurred along the Southern San Andreas Fault in the past 1200 years with an average spacing in <br />time of 140 years, plus or minus 30 years. The last such event on the Southern San Andreas was over 160 years <br />ago (the Fort Tejon Earthquake in 1857). The range of probable magnitudes on the San Andreas Fault Zone is <br />reported to be 6.8 to 8.0. <br />Figure 43 M 7.8 Repeat of the 1857 Fort Tejon Earthquake on the San Andreas Fault <br />-- Earthquake Planning Scena(o-- <br />Rapid Instrumental Intensity Map for San Andreas 1857 rupture Scenario <br />Scenario Date: Fri Feb 15. 2002 08:00:00 AM PST M 7.8 N35.70 W720.30 Depth: 10.0km <br />36.5' <br />36' <br />35.5' <br />35' <br />34.5 <br />34' <br />-121' -120' -119' -118' -117' <br />PLANN114G SCENARIO ONLY -PROCESSED: Sun Feb 23, 2003 082838 PIA PST <br />PBMAW NG <br />No11eN <br />Weak <br />L�h1 <br />Mbderate <br />Sarong <br />Veryslrong Severe Violent <br />m <br />Extree <br />MNAGEL <br />none <br />none <br />roro <br />Very igM <br />Light <br />Wderale )Jb*mWd kmvy Heavy <br />Very Heave <br />PEAKAC04%9) <br />c17 <br />-17-1.4 <br />1439 <br />3.".2 <br />01-18 <br />18.34 34.85 855-124 <br />A24 <br />PEAKVEL4vnVA <br />c0.1 <br />0.1-1.1 <br />1.13.4 <br />3.43.1 <br />8.1-16 <br />16-31 31-M 60-116 <br />>116 <br />IHSTNOMENTAL <br />IWENSITY <br />1 <br />ILlll <br />N <br />V <br />III <br />43 <br />