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Nope! No heavy machinery. It was an Earthquake. It was relatively small, so that's why only some people felt it.
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3.8 Magnitude
Thursday, April 23, 2009 at 04:56:22 PM at epicenter
3 km ( 2 mi) NE of Yorba Linda, CA
http://earthquake.usgs.gov/eqcenter.../ci10399801.php
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