[Shake-admin] ShakeMap Comments - Time of day of quakes over M3

[Bruce Worden]

Hi Jim,

Studies have shown that there is no statistically significant  
correlation between time of day and earthquake occurrence.  While  
there may be brief periods where it appears that there is a  
correlation, those are simply transient clusters in what appears to  
be a temporally random process.

Bruce Worden
USGS, Pasadena


On Aug 15, 2007, at 3:07 PM, Jim Barrett wrote:

> Region: CISN - S. California
> URL: http://earthquake.usgs.gov/eqcenter/shakemap/list.php?y=2007&n=sc
> Browser: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)
> Name: Jim Barrett
> Phone: 9514876818
>
> 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?
>
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