Selection of La Habra Ground Motion Observations

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The La Habra Earthquake was a well recored earthquake. We have selected a set of ground motion data for use in validation of our ground motion simulation results.

La Habra Data Sets

We have identified three sources of observational data for the La Habra Event. These are:

  1. StrongMotion.Org La Habra Data
  2. SCECDC Test Events For EEW and General Seismic Algorithm Testing
  3. PEER

StrongMotion.Org Observations

As of 28 March, the strong motion.org site has collection of strong motion data in Cosmos format for the La Habra Mw5.1 earthquake. They also have data for an aftershock.

  1. StrongMotion.Org La Habra Data
  2. La Habra Site Table SMO

The [strongmotion.org] site gives a list of years, select 2014, and they give you a list of earthquakes. Pick the lower caps, lahabra event, and you get to a selection page, giving list of station, information about the records, and information about whether there are structure recordings.

When a station is selected, the users selects processed, or unprocessed. We select processed. When we get a Zip file, it typically contains two file V2 and V3. The V2 file contains a header indicating the instrument type. For all SCSN, we see HN data (example. SCSN Station WLT: HN data, SCSN Station: , indicating strong motion accelerometer data. The V2 files seem to contain the time series. However, parsing is complicated because the files may contain structure response information time series as well.

After processing the event data table:

Based on contents of .V2 files, these StrongMotion.Org data are accelerometer data, channel type HN, so we will assume any CI STAT HN data is a duplicate of what we have from strong motion.org. This is an assumption of what we get from SMO. Once we retrieval all the seismograms, we do not know if this is a good assumption. If not, then some strong motion data are not HN, so we may want to include HN from SCECDC. For now, drop an SCECDC HN as duplicate of SMO data, if network, station match.

SCEC Data Center Event List

We found another collection of La Habra data in the SCEC Data Center. This is data for EEW and Seismological Algorithm Testing. These station lists are broken out by network, station, instrument, component. We will do two passes to identify that channels this adds to the set.

Based the directory manifest file, this file has a header then list of network, channel, instrument. The channel naming used by SCECDC distinguishes between FBA channels (m/sec2) [HN] and velocity sensor (m/sec) [HH] by the first two characters. For the first pass, we will select only FBA channels for Caltech.

  • Total SCECDC [HN] stations: 267
  • Total SCECDC [HN] stations in simulation region: 103

SCEC Contributors Station Lists

Seismological Software Links

Related Entries

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