Data Services Newsletter

Volume 8 : No 2 : June 2006

PBO and SAFOD Seismic Data

Previously, we announced that http://data from PBO and SAFOD, two components of EarthScope, were being archived at the IRIS DMC. This is an update to let you know that seismic data from the Plate Boundary Observatory (PBO) are now streaming continuously into the IRIS DMC archive in real-time, and that high sample rate (4kHz) San Andreas Fault Observatory at Depth (SAFOD) data soon will be available from the IRIS DMC.

Earthscope banner

PBO

Data from HS-10 seismometers (co-located with PBO borehole strain sensors) have been collected at the Array Network Facility (ANF online at http://anf.ucsd.edu/) since 2004 with data collection responsibilities currecntly being transferred to PBO. The IRIS DMC began collecting the PBO seismic data in real-time since January 2006 and has archived all previous data collected at the ANF. Currently, there are 11 stations located within the Western U.S. that are recording 3 components of 100 Hz. data. For more information about the PBO data seismic data handling at the DMC, refer to http://ds.iris.edu/earthscope/pbo/

SAFOD

The IRIS DMC and the NCEDC (Northern California Earthquake Data Center in Berkeley) were chosen to co-manage the seismic data collected by this borehole observatory located in Parkfield, California. (http://www.earthscope.org/observatories/safod/) The NCEDC will collect the seismic data channels in SEG-2 format, and convert them to the SEED format, and forward these to the IRIS DMC. These will be referenced with the FDSN network code “SF”, and will be fed into the IRIS DMC’s BUD filesystem (http://ds.iris.edu/data/bud/) using channel names like DP? and GP?.

Because of the large data volumes, (approximately 1Tb per month) the NCEDC will maintain the most recent 60-90 days of data in an online buffer, and the IRIS DMC will keep a similar volume online and transcribe older data to a near-line mass storage filesystem routinely, allowing them to still be available to the user community transparently using all normal data request mechanisms. For further information, and to get updated information regarding SAFOD seismic data at the DMC, refer to http://ds.iris.edu/earthscope/safod/.

by Rick Benson (IRIS Data Management Center)

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