Event Name: Big Bear, California Earthquake
Event Date: 06/28/1992 15:05 UTC (08:05 am PDT)
Event Identification: 19920628_1505
Recorder Type: SMA-1, CRA-1

Data Organization and Format ||  Downloads (Updated 03/12/2010) ||  Tables (Updated 03/12/2010)

Data Organization and Format

The June 28, 1992, 15:05 UTC Mw 6.5 Big Bear, California Earthquake data recorded by the USGS National Strong-Motion Network (NSMN) are available via the NSMP ftp server in the folder (directory) "19920628_1505" (https://ca.water.usgs.gov/nsmp/19920628_1505).    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.

In a departure from previous file-naming conventions (where for a particular channel the different the time series data all had the same filename, and thus required separate directories for each data type), the file names for the data have the following form:

where 'RRRR' is the four-digit recorder serial number (including leading 0's), '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.

Filenames for stations 5069 (S/N 1532), 5071 (S/N 1483), 5161 (S/N 1476), and 5295 (S/N 1456) were converted to the new file-naming convention on 03/07/2002.

Information on how the data are processed can be found in the section on DATA PROCESSING.

Downloads

Tables

List of uncorrected and corrected peak ground accelerations and corrected velocities for available time-series data (click here to obtain list as Excel spreadsheet). (Updated 03/12/2010)

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This page was posted on November 14, 2000; updated on March 12, 2010.