Example+Quake+Identification


 * [[image:LIGOquake.jpg caption="This is an example of an earthquake identification using LIGO seismic data." link="Example Quake Identification"]] || Is this August 9th, 2007 event, detected shortly after 8:00 GMT at LIGO, the same as the Mag 4.6 earthquake in the Los Angeles area? (To create the graphic, I pasted a jpg of the plot as well as a screen grab from the USGS reporting of the quake into a PPT slide, saved it as a jpg, and uploaded it.) If LA is roughly 1000 miles away, and the difference between the reported onset of the quake in LA and its onset in the LIGO data is about 8 minutes (7:59 to 8:07), then the wave would have to have traveled at 120mi/min, or 2 mi/sec, which is about (using a 8:5::km:mi conversion factor) 3.2 km/sec. This seems a plausible identification. To make it more plausible still, I would have to go on to identify the times I used on the graph, and I would (in this LIGO plot in particular) propose two times, one for p-wave and the other for s-wave identification. I would also need a more precise distance estimate, which I would obtain by posting the longitude and latitude coordinates for the quake into a Google Earth map, and then those for LIGO-Hanford, and get a distance estimate from the software.) More to come:) ||