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City of Santa Ana Emergency Operations Plan <br />Part I Basic Plan <br />Puente Hills Thrust Fault: This is another recently discovered blind thrust fault that runs from northern Orange <br />County to downtown Los Angeles. This fault is now known to be the source of the 1987 Whittier Narrows <br />Earthquake. Recent studies indicate that this fault has experienced four major earthquakes ranging in magnitude <br />from 7.2 to 7.5 in the past 11,000 years, but that the recurrence interval for these large events is approximately <br />several thousand years. <br />Figure 50 M 7.1 Earthquake on the Puente Hills Fault <br />-- Earthquake Planning Scenario -- <br />ShakeMap for Puente Hills M7.1 Scenario <br />Scenario Date: Oct 10, 201212:00:00 PM UTC M 7.1 N34.05 W117.92 Depth: 11.4km <br />34.5' <br />34' <br />33.5' <br />l ♦ .xf , 1 <br />\1 •Lancaster `n � <br />A <br />S PIR Olanl 1 , rt <br />t s g\ <br />•'IUJt Stf �I At <br />G, M1 <br />, 1 <br />y � � <br />U yi <br />Tert)&a <br />-119' -118* -117' <br />PLANNING SCENARIO ONLY — Map Version 1 Processed 2015-03-31 11:52:32 PM UTC <br />PERCEIVED <br />Nol fell <br />Weak <br />Light <br />Moderate <br />Strong <br />Very strong Severe violent <br />Extreme <br />POTENTIAL <br />AAM G <br />none <br />none <br />none <br />Very light <br />Light <br />Moderato Modhioavy Heavy <br />Very Heavy <br />PEAK AOr4%E) <br />4.1 <br />0.5 <br />2.4 <br />6.7 <br />13 <br />24 44 83 <br />> 156 <br />PEAK VEL.(enks) <br />c0.07 <br />0.4 <br />1.9 <br />5.8 <br />11 <br />22 43 83 <br />>160 <br />INSTRUMENTAL INTEN <br />1 <br />11411 <br />IV <br />V <br />VI <br />VI <br />691 <br />