Event Name: Yorba Linda, California Earthquake
Event Date: 09/03/2002, 07:08 UTC (09/03/2002, 00:08 AM PDT)
Event Identification: 20020903_1
Recorder Type: Etna, K2, Mt. Whitney

Data Organization and Format ||  Downloads (updated 10/10/2002) ||  Tables (updated 10/10/2002)

Data Organization and Format

The September 03, 2002 07:08 UTC ML 4.8 Yorba Linda, California Earthquake data recorded by the USGS National Strong-Motion Network (NSMN) are available via the NSMP ftp server in the folder (directory) "20020903_1" (https://ca.water.usgs.gov/nsmp/20020903_1).    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.

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

Downloads

• Data for station 5246 (840 Newport Beach, 840 Twin Towers, S/N 1036) and station 5407 (Pasadena, Millikan Library, S/N 133) were added to the data set on 9/16/2002.  The original data posted on 9/04/2002 have all be replaced with new versions that have updated hypocenter parameters in the file headers.  
• Data for stations 698 (Yorba Linda; Diemer Filtration Plant, S/N 1925 and S/N 1929) and 697 (Brea; Orange County Reservoir, S/N 1926 and S/N 1933) were added to the data set on 9/23/2002.  
• Peak values and time series data for channel 10 (trace "j") for station 5407 (Pasadena, Millikan Library, S/N 133) were removed from the data set on 9/24/2002 after confirmation of a faulty sensor.  
• Data for station 5296 (Pasadena, USGS/NSMP office, S/N 155) were added to the data set on 10/07/2002.  
• Data for station 709 (Monterey Park; Garvey Reservoir, abutment, S/N 1922) were added to the data set on 10/10/2002.  Recorder 1935 at the dam crest did not trigger.

Tables

List of corrected peak ground accelerations and velocities for available time-series data, updated 10/10/2002 (to obtain list as Excel spreadsheet click here ; click cancel button if get pop-up window requesting user name and password)

Return to top of page.
Return to Data Sets page
Return to NSMP Homepage

This page was posted on September 04, 2002; updated 10/10/2002.