Conterminous US, Gridded Data Values, 2003

Revised April 2003
Revised October 29, 2003

Explanation of April 2003 Revision
Explanation of October 29, 2003 Revision

These data are also available via ftp - see GENERAL:Anonymous FTP
ASCII files of gridded points used to make maps - lon, lat, value (%g) 1st line in each file gives ground-motion parameter and the probability of exceedance (PE = probability of exceedance, PGA = peak ground acceleration, SA = spectral acceleration)
0.05 degree grid spacing in latitude and longitude for entire country File sizes = approximately 21 Mb each
PGA with 10% PE in 50 yrs	0.2 sec SA with 2% PE in 50 yrs
PGA with 2% PE in 50 yrs	1.0 sec SA with 10% PE in 50 yrs
0.2 sec SA with 10% PE in 50 yrs	1.0 sec SA with 2% PE in 50 yrs

Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.