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 includes 17 existing stations: CMB, CVS, FARB, HOPS, HUMO, JCC, JRSC, KCC, MNRC, MOD, ORV, PACP, PKD, POTR, WDC, WENL, and YBH as well as two new sites: GASB and MCCM.

The 19 BDSN sites provide 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 second year of USArray, the BDSN has continued to use the 40 Hz sampling rate for the BH channels.

In addition, the BSL is collaborating with USArray to identify other sites that may be suitable to become BDSN stations. During the past year, BSL staff have been working to identify 8 potential sites for USArray/BDSN instrumentation, many at UC reserves and field stations (shown in Figure 3.1).

In the past year, BSL staff have worked with USArray to establish several new sites in northern and central California, including sites 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 (P. Hellweg) in the Sierra Nevada foothills. All these sites have been installed by USArray and data from several of them are being sent directly to the BSL as well as to the Array Network Facility. The BSL is currently evaluating the performance of these stations to determine which sites should be continued after 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 Chapter 9 for further details).

Figure 3.5: Schematic of the communication collaboration between the BSL, UCSF, Point Reyes Bird Observatory, and US Fish and Wildlife Serivce.

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