The BSL concluded an agreement with IRIS during 2003-2004 to contribute 19 stations of the BDSN to USArray while the experiment is deployed in California. This included 17 existing stations: CMB, CVS, FARB, HOPS, HUMO, JCC, JRSC, KCC, MNRC, MOD, ORV, PACP, PKD, POTR, WDC, WENL, and YBH as well as the two new sites: GASB and MCCM.

The 19 BDSN sites provided USArray with a running start in northern California. In June of 2004, the BSL set up the software necessary to exchange data with USArray and made modifications to the dataloggers to change the BH sampling rate from 20 Hz to 40 Hz. In this third year of USArray, the BDSN has continued to use the 40 Hz sampling rate for the BH channels.

During the station installation phase for northern and central California, the BSL collaborated with USArray to identify and permit sites that might be suitable as BDSN stations, several at UC reserves and field stations. The stations currently operating at Sutter Buttes, Hat Creek Radio Observatory, Eagle Lake Biological Field Station, Kirkwood Ski Area, Ben Lomond Conservation Camp, and at the summer home of a BSL staff member (M. Hellweg) in the Sierra Nevada foothills were established with support from BSL staff. Data from these sites (Figure 3.2) are being sent directly to the BSL as well as to the Array Network Facility. In addition, the BSL is monitoring data from several other USArray stations to evaluate their performance as possible future BDSN stations when USArray moves on across the country. In particular, noise comparisons are being conducted in different frequency bands for all BDSN and USArray stations in northern California (see Section 3.7. for further details).

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