Additional data added to data set on 01/04/2001.

As of 01/18/2001, files of uncorrected acceleration and corrected 
acceleration, velocity, and displacement for Episensors sensors 
have been corrected for a polarity reversal error discovered in the 
original data. The Fourier amplitude and response spectral data are 
unaffected by this correction.

Users may download only files that have been corrected for the 
polarity reversal by downloading 20000903_1_polarity.zip. The file
20000903_1_polarity.txt lists those files that have been corrected.

Integer header files for station 1762, S/N 1441, Novato Fire Station
#1 and station 1768, S/N 1439, Petaluma Fire Station #1 had incorrect 
station lat/long coordinates and distance and azimuth in the original 
data.  Corrected files were added to data set on 02/21/2001.

Real header files for entire data set corrected for Ms magnitude cell.
Original files listed Ms magnitude as 0.  Corrected files list Ms
magnitude as null value.  Corrected files added to data set on 02/21/2001.

1/25/2011
  Recorder 1103, station 1735, channel 1 sensor orientation was incorrectly
listed as 225 degrees.  Orientation corrected to 320 degrees.
 Recorder 1103, station 1735, channel 3 sensor orientation was incorrectly
listed as 45 degrees.  Orientation corrected to 50 degrees.