Event Name: Nenana Mountain, Alaska Earthquake
Event Date: 10/23/2002, 11:27 UTC (10/23/2002, 03:27 AM AKDT)
Event Identification: 20021023_1127
Recorder Type: Kinemetrics: Etna, K2; Guralp: CMG5TD; custom

Data Organization and Format ||  Download (updated 02/13/2003),  TAPS (updated 05/22/2003)  ||  Tables (updated 01/03/2003)

Data Organization and Format

The October 23, 2002 11:27 UTC Mw 6.7 Nenana Mountain, Alaska Earthquake data recorded by the USGS National Strong-Motion Network (NSMN) and the University of Alaska Geophysical Institute Anchorage Region Strong-Motion Network (University of Alaska contact: Niren Biswas niren@giseis.alaska.edu) are available via the NSMP ftp server in the folder (directory) "20021023_1127" (https://ca.water.usgs.gov/nsmp/20021023_1127).    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) 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.  Important note: 'RRRR' is the four-digit station code (k201 to k222) for the University of Alaska's Advanced National Seismic System (ANSS) data.

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.

Data recorded by the Alyeska Pipeline Service Company (APSC) are provided on a cooperative basis to the USGS and can be accessed at:
/data_sets/20021023_1127_taps.html

Downloads

TAPS (Trans-Alaska Pipeline)
Data recorded by the Alyeska Pipeline Service Company (APSC) are provided on a cooperative basis to the USGS and can be accessed at:
/data_sets/20021023_1127_taps.html

To facilitate downloading the data, the data have been compressed into PC compatible ".zip" format.  The same zip file is located in the "zips" folder in "20021023_1127/" on the NSMP ftp server, "https://ca.water.usgs.gov/nsmp/20021023_1127".

• Peak values and time series data for the UA Anchorage Strong-Motion Network (station code K2-01 to K2-22) were added to the data set on 11/01/2002.  
• Horizontal sensor azimuths for station K2-16 were corrected on 11/01/2002 (ch1 360 to 120 degrees, ch3 90 to 210 degrees).
• Peak values and time series data for stations FA02 (Fairbanks; Ester Fire Station, S/N 5609), 2784 (Valdez; City Hall, S/N 1728), 8017 (Anchorage; Aho Residence, S/N 1736), 8036 (Anchorage; DOI Office of Aircraft Services, S/N 1731), 8037 (Anchorage; NOAA Weather Facility, S/N 1397), 8038 (Anchorage; New Fire Station # 1, S/N 1737), and 8039 (Anchorage; New Fire Station # 7, S/N 1734) were added to the data set on 11/15/2002.
• Station 8016 (Anchorage; BP Building, S/N 1356) horizontal sensor orientation for channel 6 (trace F) corrected from 360 to 180 degrees on 11/22/2002.
• Peak values and time series data for stations ps07, ps08, ps09 (TAPS) added to data set on 01/03/2003 (updated 05/22/2003).

Tables

List of corrected peak ground accelerations and velocities for available time-series data, updated 01/03/2003 (to obtain list as Excel spreadsheet click here ; click cancel button if get pop-up window requesting user name and password)

UA Anchorage Strong-Motion Network Site Characteristics (posted 10/31/2002) 

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This page was posted on October 29, 2002; updated 05/22/2003.