The U.S. Geological Survey (USGS) provides real-time location and size data on earthquakes for Google Earth. Visible information includes when the earthquake took place (color coded for past hour (red), past day (orange) or past week(yellow)), the size of the quake (larger circles = larger quakes), and the epicenter of each quake (where the circle is placed). Other data provided by the USGS includes fault lines, plate boundaries and their direction of movement.
The following image shows quake data for the California/Mexico border this past weekend.
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