STRAIN ACCUMULATION NEAR YUCCA MOUNTAIN, NEVADA, 1983-1993

被引:12
作者
SAVAGE, JC
LISOWSKI, M
GROSS, WK
KING, NE
SVARC, JL
机构
关键词
D O I
10.1029/94JB01551
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Over the decade 1983-1993 the U.S. Geological Survey has measured the deformation of a 50-km-aperture trilateration network centered on Yucca Mountain the proposed disposal site for high-level nuclear waste in the United States. The network was surveyed in 1983, 1984, and 1993. The average annual principal strain rates are 0.010 +/- 0.020 mu strain/yr N90 degrees W +/- 24 degrees and -0.009 +/- 0.021 mu strain/yr N00 degrees E +/- 24 degrees, indicating no significant strain accumulation. The southeast corner of the network was disturbed on June 29, 1992, by the Little Skull Mountain earthquake (M(s) = 5.4), the epicenter of which is about 20 km southeast of the Yucca Mountain site. Using the seismically determined fault plane (dip 54 degrees S55 degrees E), we find that 0.580 +/- 0.075 m of normal slip on a 5-km square rupture surface at a depth of about 8 km provides a good fit to the observed deformation in the southeast corner of the network. The inferred seismic moment is (4.4 +/- 0.6) x 10(17) N m, which compares well with the observed seismic moment of 4.1 x 10(17) N m.
引用
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页码:18103 / 18107
页数:5
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