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City of Santa Ana Emergency Operations Plan <br />Part I Basic Plan <br />San Jacinto Fault Zone: This 130-mile-long fault is located approximately 30 miles north and east of the county <br />and parallels the near side of the San Andreas Fault. The San Jacinto Fault was active with several earthquakes <br />in the first half of the 20'li century. The most recent event (1968 M6.5) occurred on the southern half of the Coyote <br />Creek segment. The estimated recurrence interval between ruptures is between 100 and 300 years, per segment <br />with probable magnitudes in the range of 6.5 to 7.5. <br />San Joaquin Hills Fault: Recently discovered in the 1990's, this fault originates near the Newport -Inglewood <br />Fault close to Huntington Beach and runs south, paralleling the 405 and 73 Freeways at the western margins of <br />the San Joaquin Hills. Rupture of the entire area of this blind thrust fault could generate an earthquake as large <br />as M 7.3. Fortunately, the average recurrence interval for moderate -sized earthquakes on this fault has been <br />estimated between about 1,650 and 3,100 years with the last major rupture occurring in 1769. <br />Figure 49 M 6.6 Earthquake on the San Joaquin Hills Fault <br />-- Earthquake Planning Scenario — <br />ShakeMap for San Joaquin Hills Scenario <br />Scenario Date: Sat Jan 1112003 04:00:00 AM PST M 6.6 N33.50 W117.75 Depth: 7.5km <br />340 <br />33.5' <br />33" <br />-118' -117' <br />PLANNING SCENARIO ONLY— fMp Version 2 Processed Tue Nov 30; 2010 02:10:09 PM PST <br />PERCEIVE <br />Notfeh <br />Weak <br />LigM <br />Moderate <br />Sticng <br />Very strong Severe Violentm Extree <br />ParENTLAL <br />none <br />I AOAe <br />none <br />Very Ight <br />light <br />lAoderate IlAcderaleMeinyl Heavy Vety HeavOAMAGE <br />PEAK AW48g) <br />4.17 <br />.17-1.4 <br />1.4-29 <br />2.9-9.2 <br />92-18 <br />18-34 34-05 85-124 >124 <br />PFAKVELtamfa) <br /><0.1 <br />0.1-1.1 <br />1.1-3.4 <br />3.4-8.1 <br />8.1-18 <br />IB-31 M-60 50-110 >116 <br />IN INNTENSITY"L <br />I <br />will <br />N <br />V <br />VI <br />49 <br />