Word: shakemap
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...from seismic waves that propagate out from the fault at 8,000 or more m.p.h. While the punch packed by these waves tends to diminish as the distance from the fault increases, that's not always the case. From historical accounts, USGS seismologist Jack Boatwright has assembled a ShakeMap for 1906--a map that displays the intensity of shaking in different areas. For San Francisco and other communities close to the San Andreas, it was quite severe. But even more severe was the shaking that occurred in the city of Santa Rosa, more than 15 miles away from the fault...
...intensity blue to medium-intensity yellow and high-intensity red. Then Aagaard calls up 1906. The difference is immediately apparent. This time red flows across the landscape like a river of lava, and among the places that glow the brightest is the area around Santa Rosa, just as the ShakeMap says it should...
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