U.S. Geological Survey       National Strong-Motion Program

Event Name: Kepulauan Mentawai Region, Indonesia Earthquake
Event Date: 09/12/2007, 23:49 UTC (09/13/2007, 06:49 AM Local Time)
Event Identification: 20070912_2349
Recorder Type: Kinemetrics: K2
Event ID#: us2007hec6

Data Organization and Format ||  Download  ||  Tables

Data Organization and Format

The September 12, 2007, 23:49 UTC, Mw 7.9, Kepulauan Mentawai Region, Indonesia Earthquake data recorded by the Caltech Tectonics Observatory (CTO), with funding from USAID for the Indian Ocean Tsunami Warning System (IOTWS) provided to CTO through the USGS Cooperative Agreement award #06WRAG0013, are available via the NSMP ftp server in the folder (directory) "20070912_2349" (ftp://smftp.wr.usgs.gov/20070912_2349).   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.  

These CTO data are posted using IRIS SNCL conventions:

uncorrected acceleration: 200709122349_pski.to.hne.._u.smc
corrected acceleration: 200709122349_pski.to.hne.._a.smc
corrected velocity: 200709122349_pski.to.hne.._v.smc
corrected displacement 200709122349_pski.to.hne.._d.smc
response spectra: 200709122349_pski.to.hne.._r.rs2
Fourier amplitude spectra (f): 200709122349_pski.to.hne.._f.fs1

where '200709122349' is the UTC date of the earthquake, 'pksi' is the four-character CTO station code for this recorder, 'to' is the two-character network code for "CTO",' hne' is the three-character channel code (h is a code indicating the passband and sampling rate of the instrument, n indicates an accelerometer, e is the sensor orientation), '..' is the place saver for the two-character location code (not defined here), 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.  Note that these data were processed using an acausal Butterworth locut filter.


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 "20070912_2349/" on the NSMP ftp server, "ftp://smftp.wr.usgs.gov/20070912_2349".

20070912 23:49 UTC, Kepulauan Mentawai Region, Indonesia Earthquake Downloads in ".zip" format

20070912_2349_uncorr.zip     uncorrected (0.3 MB; uncompresses to 1.0 MB)
20070912_2349_corr.zip     corrected (1.9 MB; uncompresses to 5.8 MB)


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

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This page was posted on September 28, 2007.