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City of Santa Ana Emergency Operations Plan <br />Part 1 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 />ShakeMap for Elsinore Fault M6.8 Scenario <br />Scenario Date: Wed Apr 10, 2002 05:00:00 AM PDT M 6.8 N33.49 W117.18 Depth: 5.0km <br />34' <br />33 S* <br />33' <br />-1180 -1170 -116' <br />PLANNING SCENARIO 014LY — 10ap Versio n 3 Processed Thu Oct 25, 2007 12:4331 Plot P DT <br />PEO <br />SHAKING <br />Notteft <br />Weak <br />Light <br />Moderate <br />Strong <br />Verystrong <br />Severe Violent Extreme <br />P DAMAGEL <br />^0^e <br />rt" <br />none <br />Very Ight <br />Light <br />IAoderate <br />IAoderaale Heavy Heavy Very Heavy <br />PEAK A004%g) <br /><.17 <br />.17-1.4 <br />1.43.9 <br />3.9-9.2 <br />92-18 <br />1834 <br />34-05 65-124 >124 <br />PEAK VEL(cm'a) <br /><0.1 <br />0.1-1.1 <br />1.13.4 <br />3.4-8.1 <br />8.1-16 <br />VI <br />1631 <br />VII <br />31-60 00-116 >116 <br />INSTRUMENTAL <br />INTENSITY <br />I <br />14111 <br />N <br />Y <br />rr7 <br />