Good science site...
http://scedc.caltech.edu/
http://scedc.caltech.edu/recent/Quakes/quakes0.html
http://service.scedc.caltech.edu/SCSNStationMap/station.html
"We name earthquakes after map locations near epicenters to have a convenient way to refer to them, but this can be misleading. We define the epicenter of an earthquake with the latitude and longitude of a point, but the earthquake is bigger than that point. The fault's rupture surface can be hundreds of kilometers long and several kilometers wide, and even the epicenter can only be determined within a few tenths of a kilometer. Therefore, giving the location of an earthquake in terms of city streets is like giving the location of your city by the address of City Hall."
http://scecinfo.usc.edu/eqcountry/roots/measuring.html
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