Final report on Task 12: Southern Great Basin seismic network operations

The Nevada Seismological Laboratory began seismic monitoring operations under the DOE-UCCSN Cooperative Agreement on 11/01/1999. This final report summarizes our activities and studies made in the four years up to 09/30/2003. Previously, NSL operated under the M&O for the Yucca Mountain Project from October 1995 through September 1999 and under the U. S. Geological Survey from October 1992 through September 1995. For purposes of this report, earthquakes occurring in the years FY1998 and FY1999 were analyzed in the first two years of the NSL’s involvement with the Cooperative Agreement, and they will be treated here, along with the data in the years FY2000, FY2001, and FY2002. During the four years of funding under the Cooperative Agreement, FY2000-FY2003, NSL has maintained a seismic network in the vicinity of Yucca Mountain; installed a strong-motion capability at 10 sites; installed a borehole array of strong-motion instruments near the ESF north portal; and has conducted various studies on seismic-wave attenuation, earthquake interactions, the character of the stress field, and seismotectonics, all within the southern Great Basin and mostly focused on the immediate vicinity of Yucca Mountain. This report will summarize these operational efforts and associated investigative studies. This report references many of the previous reports submitted under the Cooperative Agreement and does not present any new data itself