In late 2003, the CISN concluded a memorandum of agreement with the Incorporated Research Institutions in Seismology (IRIS) covering the duration of the USArray project in California. As a result 19 stations operated by the BSL and 41 stations operated by Caltech are part of USArray during its California deployment.
Both Caltech and the BSL needed to modify some aspects of their station operation in order to meet the USArray specifications. In particular, USArray calls for BH data sampling at 40 Hz, rather than the 20 Hz rate that has been standard in California. In the case of the BSL, all surface broadband stations were converted to 40 Hz over June 15-16th, 2004.
Also as part of this collaboration, the BSL has worked with USArray to survey and permit several sites in Northern California.
The collaboration between the BSL and USArray is discussed more fully in Chapters 3 and 9.
Berkeley Seismological Laboratory
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