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We performed a pilot dense array experiment aimed at testing noise-based seismic monitoring of the San Jacinto fault in Southern California (UGA/ISTerre, UCSD/IGPP, USC).
It consisted in the deployment of two arrays composed of 100, 5 Hz seismic stations at the cahuilla reservation area and 300, 5 Hz seismic stations at Pinon flat. We recorded 30 days of continuous data in July-August 2018. Both arrays at 15 km apart from the San Jacinto fault. Interstation spacing is ~100 m. The data were recorded at 250 Hz (4 ms) with 36 dB pre-amp gain.
July 15 2018
The French team is celebrating the French soccer team winning the world cup with California Champagne!
July 16 2018
The 400 stations properly arrived at IGPP/UCSD, La Jolla San Diego!
July 18
We are loading the equipment, get trained and heading towards Idyllwild!
July 19
First day of field work at the Cahuilla Indian reservation. We deployed 99 stations under a temperature of 90° F (32 ° C).
The bushes are quite dense sometimes!
Chris starts preparing the instruments
Frank almost got bit by a rattlesnake!
We were fortunate to get support from the consulate people including the general consul of France in LA, M. Christophe LEMOINE!
The GSR, Geospace stations are composed of 1/ a 5 Hz vertical geophone, a recording station and a battery. All geophones were buried.
July 20 and 21
Deployment of 300 stations at Pinon Flat, the most instrumented place on Earth for geophysics!
Thanks to all!
© A. Mordret 2018
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