Event Name: Offshore Eureka, California Earthquake
Event Date: 09/22/2000 10:50 UTC (09/22/2000 03:50 am PDT)
Event Identification: 20000922_1
Recorder Type: ETNA

Data Organization and Format ||  Downloads (updated 01/18/2001) ||  Tables (updated 01/18/2001)

Data Organization and Format

The September 22, 2000, 10:50 UTC Mw 4.5 Offshore Eureka, California Earthquake data recorded by the USGS National Strong-Motion Network (NSMN) are available via the NSMP ftp server in the folder (directory) "20000922_1" (https://ca.water.usgs.gov/nsmp/20000922_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

Files of uncorrected acceleration and corrected acceleration, velocity, and displacement for Episensors sensors were corrected for a polarity reversal error discovered in the original data. The Fourier amplitude and response spectral data are unaffected by this correction." .  Users who downloaded data before 01/18/2001 should download the data set again.

Tables

List of corrected peak ground accelerations and velocities for time-series data; updated 01/18/2001 (click here to obtain list as Excel spreadsheet)

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This page was updated on January 18, 2001.