Reno . . Las Vegas Wells . The Wells earthquake was thought to be less likely than a magnitude-6 in Las Vegas. USGS J. Louie, NESC 5/7/2008.

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Presentation transcript:

Reno . . Las Vegas Wells . The Wells earthquake was thought to be less likely than a magnitude-6 in Las Vegas. USGS J. Louie, NESC 5/7/2008

Feb 21 M6.3 event near Wells From 2006 through half of 2008, NSF-funded USArray stations (blue triangles) help us monitor E. Nevada. They are being moved east now! It would cost $30k to retain a station. How do we keep the 40 USArray stations that are the only way to monitor quakes like this? J. Louie, NESC 5/7/2008

Feb. 21 M6.3 event near Wells NSL ShakeMap shows effect of basins and soils on peak ground velocity (PGV) contours. Presently, Vs30 is estimated from topographic slope only for Nevada ShakeMaps. J. Louie, NESC 5/7/2008

Wells, NV M6.0 2/21/2008 ShakeMap PGV shows bullseyes at stations and CIIM zipcode centroid points. J. Louie, NESC 5/7/2008

Wells, NV M6.0 2/21/2008 E-shallow-dip fault from initial Dreger CMT. Hypocenter deep on fault. Directivity up, westward. J. Louie, NESC 5/7/2008

Wells, NV M6.0 2/21/2008 E-shallow-dip fault from initial Dreger CMT. Hypocenter deep on fault. Directivity up, westward. J. Louie, NESC 5/7/2008

Wells, NV M6.0 2/21/2008 NW-steep-dip fault from initial Dreger CMT. Hypocenter deep on fault. Directivity up, eastward. J. Louie, NESC 5/7/2008

Wells, NV M6.0 2/21/2008 NW-steep-dip fault from initial Dreger CMT. Hypocenter deep on fault. Directivity up, eastward. J. Louie, NESC 5/7/2008

Wells, NV M6.0 2/21/2008 NW-dip fault plane matches recorded PGVs better than shallow E-dip plane. J. Louie, NESC 5/7/2008