Introduction

The Berkeley Digital Seismic Network (BDSN) is a regional network of very broadband and strong motion seismic stations spanning northern California and linked to UC Berkeley through continuous telemetry (Figure 3.2 and Table 3.1). The network is designed to monitor regional seismic activity at the magnitude 3+ level as well as to provide high quality data for research projects in regional and global broadband seismology.

Since 1991 the BDSN has grown from the original 3 broadband stations installed in 1986-87 (BKS, SAO, MHC) to comprise 27 stations, including an autonomous ocean-bottom seismometer in Monterey Bay (MOBB). We take particular pride in high quality installations, which often involve lengthy searches for appropriate sites away from sources of low-frequency noise, as well as continuous improvements in installation procedures and careful monitoring of noise conditions and problems. Thus, the focus of this year's technical efforts evolved to maintenance and repair, because of aging instruments, the desire for higher data rates, corrosion and outright equipment failure. Considerable engineering and research activities were also involved in a project to develop new electronics for the STS-1 seismometers (see Section 3.7.).

Further expansion of our network to densify the state-of-the-art strong motion/broadband seismic network and the joint earthquake notification system in this seismically hazardous region, one of BSL's long term goals, must be coordinated with other institutions and is contingent on the availability of funding.

Equally important, data quality and the integrity of the established network must be preserved and remain assured despite expansion. The first generation of broadband seismometers installed by BSL have been operating for almost 25 years. At the same time, the first generation of broadband dataloggers are entering their 16th year of service. These will both require continued vigilance and greater time commitment to both repairs and upgrades in the future.

Berkeley Seismological Laboratory
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