Scientists: Silent tremors may foretell next Big One

The seismometer is snugged in its hole and tamped over with dirt. Now it's time for the stomp test.

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<p><a href="http://www.physorg.com/news166089342.html">Scientists: Silent tremors may foretell next Big One</a></p> <p>The seismometer is snugged in its hole and tamped over with dirt. Now it's time for the stomp test.</p>