Ground Water at Yucca Mountain How High Can It Rise? (1992) / Chapter Skim
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Appendix E: Probabilities of Earthquakes Near Yucca Mountain, Nevada
Appendix E: Probabilities of Earthquakes Near Yucca Mountain, Nevada
Pages 223-231
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From page 223... ...
These techniques provide insight into how likely are earthquakes that might result in significant water-table changes under the proposed repository through changes in crustal stress. Given the data available in the shyly region, we have made some arbitrary but reasonable assumptions, in particular regarding rates of 223
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From page 224... ...
In order to make estimates of slip rate on faults (other than the Windy Wash Fault) and faulted zones, we have made several assumptions about the responses of these faults to tectonic processes currently active near Yucca Mountain: 1.
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The proposed repository boundary is shown dotted; rock units in the area are shown hatched.
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From page 226... ...
indicate that the southern portion of the Yucca Mountain rotated 20° to 30° clockwise about a vertical axis since the emplacement of the 13 my old Tiva Canyon luff. Assuming that this rotation was accommodated by block rotations and strike slip on faults between the blocks and assuming a spacing between the active faults, one can estimate the long-term average fault slip rate.
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From page 227... ...
Those high slip rates, if they apply to the present and if they are entirely seismic, imply that three to five earthquakes with a total oblique slip of 1 m would occur over the 5 km faulted zone within 10,000 years. However, seismic slip in relatively low strain regions may be one-third or less of the total geologic slip rate.
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From page 228... ...
fM(m) `[ dm where vi is the annual rate of occurrence of earthquakes in the magnitude range of interest, M is moment magnitude, ~ is location, and the integral over location includes only those rupture locations such that the distance r between the repository and the closest part of the rupture is less than a times the rupture length.
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From page 229... ...
We have therefore used several ranges of magnitudes, to illustrate how the probability calculations change with choices of the smallest and largest earthquake. These types of calculation are stanclard in seismic hazard analysis, and available computer programs have be used to perform them.
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during its design lifetime of 104 years. SUMMARY A straightforward seismic hazard analysis has been conducted to examine the probability that the proposed repository at Yucca Mountain might be close to a moderate earthquake originating on one of the nearby faults.
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1984. Regional Structural Setting of Yucca Mountain, Southwestern Nevada, and Late Cenozoic Rates of Tectonic Activity in Part of the Southwestern Great Basin, Nevada and California.
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