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City of Santa Ana Emergency Operations Plan <br />Part I Basic Plan <br />Elsinore Fault Zone: Located along the eastern border of the Orange County, this fault follows a general line <br />east of the Santa Ana Mountains southward into Mexico. The main trace of the Elsinore Fault zone is about 112 <br />miles long. The last major earthquake on this fault occurred in 1910 (M 6.0), and the interval between major <br />ruptures is estimated to be about 250 years. SCEC reports probable earthquake magnitudes for the main trace of <br />the Elsinore fault to be in the range of 6.5 to 7.5. At the northern end of the Elsinore Fault zone, the fault splits <br />into two segments: the 25-mile-long Whittier Fault (probable magnitudes between 6.0 and 7.2, unknown <br />recurrence), and the Chino Fault (mentioned below). <br />Figure 46 M 6.8 Earthquake on the Elsinore Fault <br />-- Earthquake Planning Scenario -- <br />hakeMap for Elsinore Fault M6.8 Scenario <br />Scenario Date: Wed Apr 1 0, 2002 05:00:00 AM PDT M 6.8 N33.49 W117.18 Depth: 6.Okm <br />34' <br />33. J <br />3 3' <br />-117' -11 B° <br />P LA NN ING SIDE NARIO ONLY — Map Versio n 3 P rueessed Th u Oct 25, 2007 12.4331 P M P DT <br />RSHAKING <br />Notielt <br />Weak <br />Light <br />Moderate <br />Strong <br />Verystrang <br />Severe Violent Extrurrle <br />POTF=NTIALL <br />oAIw;oE <br />tune <br />rxy"B <br />norR <br />VeryIghi <br />Lighi <br />Moderate <br />ModeralefFieswy Heavy Yery Heavy <br />PEAK ACG. 'kqj <br />-e.17 <br />.17-1.4 <br />1.4-3.9 <br />2. P-IR2 <br />9.2-15 <br />18-34 <br />34-05 C.5-124 A 24 <br />PUKvr=L urns} <br /><0.1 <br />0.1-1.1 <br />1.1-3.4 <br />3.-1-$.1 <br />M-16 <br />1B-31 <br />31-60 60-11S >115 <br />INSTRUMENTAL <br />INTENSITY <br />1��il <br />l <br />il <br />in <br />46 <br />