USGS Pasadena Public Lecture
March 15 - Thursday - 8pm - Baxter Lecture Hall, Caltech campus

Did You Feel It? - David Wald, USGS Pasadena

The most common information available immediately following an earthquake is the location and magnitude. However, what we really want to know is where the shaking was felt, and in the case of emergency response, where it shook the most. Two new systems can now answer these questions within minutes following an earthquake. ShakeMaps show the distribution of earthquake shaking in southern California as measured by the seismic instruments. Community Internet Intensity Maps also show the areas of greatest shaking, but they require the input of Internet users to show where the earthquake was felt and how strongly it shook. The Washington earthquake on February 28, 2001 has received input from over 10,000 residents. Both maps are available on the Internet. We will talk about how each of these maps are created, what they can be used for, and how you can help.

See http://pasadena.wr.usgs.gov/lectures/ for more information.

Shakemaps are at http://www.trinet.org/shake/
Did You Feel It? maps are at http://pasadena.wr.usgs.gov/shake/