Region: CISN - S. California<br />URL: http://earthquake.usgs.gov/eqcenter/shakemap/list.php?y=2007&n=sc<br />Browser: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)<br /><p>Name: Jim Barrett<br />Phone: 9514876818<br /></p><p>Is there any reason why the majority of quakes over magnatude 3.0 are at night time between the hours of 1800-0600? Lunar tidal forces or other?</p>