quick answer
Posted by John Vidale on December 03, 2006 at 22:26:16:

A relocated quake is one for which the location has been redetermined more accurately. There are a number of techniques, and Chris is right, southern California now has some quite accurate catalogs available through the SCEC web pages.

PDE is the preliminary determination of epicenters, if memory serves me, a quick USGS location that often has room for improvement.

Follow Ups:
     ● Thanks, again. (NT) - Cathryn  22:59:43 - 12/3/2006  (60866)  (0)
     ● All of my work down the drain.... - Glen  22:49:54 - 12/3/2006  (60861)  (1)
        ● Re: All of my work down the drain.... - Cathryn  23:06:58 - 12/3/2006  (60868)  (1)
           ● most locations don't change much - John Vidale  23:44:40 - 12/3/2006  (60875)  (2)
              ● Re: most locations don't change much - heartland chris  07:05:05 - 12/4/2006  (60889)  (0)
              ● Re: most locations don't change much - Glen  05:28:30 - 12/4/2006  (60883)  (0)