Event Name: Hector Mine, California Earthquake
Event Date: 10/16/1999 09:46 UTC (10/16/1999 02:46 am PDT)
Event Identification: 991016_1
Recorder Type: ETNA, K2, MT. WHITNEY, SSA-1, SSA-2

Data Organization and Format ||  Downloads (updated 04/30/2001) ||  Tables (updated 10/10/2000) || Errata (updated 04/30/2001)

Data Organization and Format

The October 16, 1999 09:46 UTC Hector Mine, California Earthquake data recorded by the USGS National Strong-Motion Network (NSMN) are available via the NSMP ftp server in the folder (directory) "991016_1" (https://ca.water.usgs.gov/nsmp/991016_1).  Data from a variety of  recorders can be downloaded.  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 Hector Mine 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.

Currently the uncorrected data for all of the digital records obtained by the USGS for the Hector Mine earthquake are available, and corrected data are available for all but a few problematic recordings. Corrected data for the remaining records and for selected analog recordings will be posted as they become available. See the section on DATA PROCESSING.

Downloads

To facilitate downloading the data, several subsets of the data have been compressed into PC compatible ".zip" format.  These same zip files are located in the "zips" folder in "991016_1/" on the NSMP ftp server.  View the errata documentation for updates to the data set.