Friday, November 21, 2014

Grand Canyon North Rim quake

A magnitude 2.9 earthquake occurred  shortly after noon today on the north side of Grand Canyon.  The USGS placed the epicenter about 19 miles northwest of Grand Canyon Village, but Dr. Jeri Young who runs the Arizona Broadband Seismic Network here at AZGS, places it further northeast. [Right, red star marks USGS epicenter.   The red circle marked "112114" marks the AZGS location]

Jeri used 3 of Northern Arizona University's nearby analog seismic stations and a different crustal velocity model than the USGS model.     However, they  used 42 phases and we used only 9 in making the calculation, so we are not sure which is the more accurate location.

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