Comments for Virginia Earthquake Clearinghouse http://www.eqclearinghouse.org/2011-08-23-virginia M5.8 August 23, 2011 at 17:51:04 UTC Thu, 25 Aug 2011 22:37:47 +0000 hourly 1 http://wordpress.org/?v=3.2.1 Comment on Maps by Fred Turner http://www.eqclearinghouse.org/2011-08-23-virginia/2011/08/25/maps/#comment-2 Fred Turner Thu, 25 Aug 2011 22:37:47 +0000 http://www.eqclearinghouse.org/2011-09-23-virginia/?p=722#comment-2 Shakemap has been updated and supercedes that shown above. For the latest version go to: http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/se082311a.html#maps Since Virginia only has 3 strong motion recording stations, initial Shakemaps had to rely heavily on computer simulations. USGS has decided to base later versions such as version 6 on Did you Feel It, Community Internet Intensity Map data, consolidated into zip codes, located at zip centroids and then rerunning Shakemap as if the CIIM data located at zip centroids were reasonable estimates of ground motions resulting in potentially faster convergence with ground truthing than Shakemap can in the absence of additional recorded motions. Shakemap has been updated and supercedes that shown above. For the latest version go to:

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/se082311a.html#maps

Since Virginia only has 3 strong motion recording stations, initial Shakemaps had to rely heavily on computer simulations. USGS has decided to base later versions such as version 6 on Did you Feel It, Community Internet Intensity Map data, consolidated into zip codes, located at zip centroids and then rerunning Shakemap as if the CIIM data located at zip centroids were reasonable estimates of ground motions resulting in potentially faster convergence with ground truthing than Shakemap can in the absence of additional recorded motions.

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