Data Organization and Format

The August 23, 2011, 17:51 UTC, Mw 5.8, Mineral, Virginia Earthquake data recorded by the USGS National Strong-Motion Project (NSMP) and the USGS National Earthquake Information Center (NEIC) are available via the NSMP ftp server in the folder (directory) "20110823_1751" (https://ca.water.usgs.gov/nsmp/20110823_1751).    The time series provided are available in uncorrected acceleration, corrected acceleration, corrected velocity, corrected displacement, response spectra (relative displacement, relative velocity, pseudo-velocity, and absolute acceleration), and Fourier amplitude spectra of corrected acceleration.  All of the data are in SMC format.  

USGS NEIC Quanterra and SUSSN Guralp data for this event use the following file-naming convention:

N = Network Code
S = Station code
C = SEED channel
L = Location code

USGS NSMP data have the following form:

where 'RRRR' is the four-digit recorder serial number (including leading 0's) for the USGS data, 'c' is the channel number of the recorder ('a' corresponds to channel 1, 'b' to channel 2 , etc), the '_x' is used to identify the data type, and the suffix refers to the data format (rs2 and fs1 are valid SMC format types recognized by the BAP processing program.

The data are stored in two directories: uncorrected (only uncorrected acceleration) and corrected (all of the corrected and processed data, including acceleration, velocity, displacement, response spectra and Fourier amplitude spectra. This convention for organizing the data was implemented to avoid confusion between the directory names (Vol1, Vol2, … Vol6) previously used for some earlier events and the standard conventions for Volume1, Volume2 and Volume 3 processing.

Information on how the data are processed can be found in the section on DATA PROCESSING.  Note that these data were processed using an acausal Butterworth locut filter.

Downloads

Tables

List of corrected peak ground accelerations and velocities and pseudo-spectral accelerations for available time-series data updated 11/23/2011, (to obtain list as Excel spreadsheet click here ; click cancel button if get pop-up window requesting user name and password)

Errata

A scaling error for recorder 3711 (station CBN, VA:Corbin; Fredricksberg Observatory) was discovered in the original data posted on 8/24/2011 and the revised data were added to the data set on 9/16/2011.