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Event Name: Sierra El Mayor, Mexico Earthquake
Event Date: 04/04/2010, 22:40 UTC (04/04/2010, 03:40 PM PDT)
Event Identification: 20100404_2240
Recorder Type: Kinemetrics: Etna, K2
Network Event ID#: ci14607652
Data Organization and Format || Download (updated 12/06/2012) || Tables (updated 12/06/2012) || Errata 12/06/2012
The April 04, 2010, 22:40 UTC, Mw 7.2, Sierra El Mayor, Mexico Earthquake data recorded by the USGS National Strong-Motion Network (NSMN) are available via the NSMP ftp server in the folder (directory) "20100404_2240" (https://ca.water.usgs.gov/nsmp/20100404_2240). 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:
| uncorrected acceleration: | RRRRc_u.smc |
| corrected acceleration: | RRRRc_a.smc |
| corrected velocity: | RRRRc_v.smc |
| corrected displacement | RRRRc_d.smc |
| response spectra: | RRRRc_r.rs2 |
| Fourier amplitude spectra (f): | RRRRc_f.fs1 |
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.
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 "20100404_2240/" on the NSMP ftp server, "https://ca.water.usgs.gov/nsmp/20100404_2240". Additional data will be added as they are processed. Official earthquake name changed on 4/7/2010 from "Laguna Salada" to "Sierra El Mayor" (name change does not affect time series data). Data for ten additional recorders were added to the data set on 4/7/2010. Data for eleven additional recorders were added to the data set on 4/12/2010. Uncorrected and corrected data for one additional recorder (S/N 513, station 5282) and processed data for five recorders were added on 6/8/2010.
20100404 22:40 UTC Sierra El Mayor, Mexico Earthquake Downloads in ".zip" format |
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| 20100404_2240_uncorr.zip | uncorrected (17 MB; uncompresses to 52 MB; updated 12/06/2012) |
| 20100404_2240_corr.zip | corrected (93 MB; uncompresses to 287 MB; updated 12/06/2012) |
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) updated 12/06/2012
Station 5068,
CA: Thousand Palms; Post Office, Etna s/n 2593, channels a (1) and b (2) had
incorrect sensor orientations listed in data.
ch, original, corrected orientation
1 90
45
2 360
315
Data corrected 12/06/2012.
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This page was posted on April 06, 2010, updated 12/06/2012.