Analysis of Seismic Data Collected Near the Eastern Kazakh and Nevada Test Site
Abstract
Seismographic stations were operated for several months during 1987 at 3 sites within 250 km of the Kazakh Test Site in the USSR and through most of 1988 and early 1989 at 3 sites within 250 km of the Nevada Test Site. The Soviet sites included Karkaralinsk, Bayanaul, and Karasu, and the US stations were located at Nelson, NV, Deep Springs, CA, and Troy Canyon, NV. All 6 stations were equipped with high-frequency, three-component surface (1-80 Hz) and borehole (.2-80 Hz) instruments. We have analyzed nearly 2,000 recordings of ambient ground noise collected at the US stations and have systematically reexamined several hundred noise measurements from the USSR sites to compare surface and borehole noise levels among the 6 locations. Wind speed was recorded during most of the deployment at each site, making possible a comparison of noise levels at each station as a function of wind speed. The operational periods yielded data covering a reasonable sampling of meteorological conditions, although the overall duration of occupation of each site was too short to permit a reliable characterization of seasonal noise variations. Conclusions include: (1) In general, noise levels in the boreholes were affected by wind conditions to a much smaller degree than were the surface emplacements. (2) Wind did not become a noticeable source of noise at the surface emplacements until a minimum wind speed was reached (typically 4 to 5 m/sec). (edc)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1989
- Accession Number
- ADA223230
Entities
People
- F. Vernon
- H. Given
- H. Gurrola
- J. B. Minster
- J. Berger
Organizations
- University of California, San Diego