As originally conceived, the Hayward Fault Network was to consist of 24 to 30 stations, 12-15 each north and south of San Leandro, managed respectively by UCB and USGS. Due to USGS funding limitations, however, the original plan has been significantly modified. The USGS component, for example, is now limited to 5 stations. With additional Caltrans support, however, development of the NHFN component of the project has continued. Currently, 14 NHFN sites are now operational and 4 more sites should come on-line soon (PETB, RB2B, E07B and W05B) having downhole sensors in place and surface equipment ready for installation. Activation of PETB (expected the 2nd week of October, 2007) and RB2B are planned first, with the addition of W05B and E07B as progress on the Bay-Bridge retrofit project allows.
With Caltrans funding, we have also purchased sensors and instrumentation for 2 additional sites, and Caltrans will provide drilling for these sites as spare drilling crew time becomes available (i.e., holes of opportunity). Permit negotiations for these two sites (PINB, shown in Figure 3.10; and a site at Cal Maritime Academy, not shown) are in their final stages, and the availability of Caltrans drilling is anticipated later this year or early next. We have also been asked by Caltrans to submit a proposal for the addition of 3 more NHFN sites in the coming years, an opportunity we are pursuing with vigor.
Berkeley Seismological Laboratory
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