干旱区生态环境知识资源中心(Arid): Summary and evaluation of existing geological and geophysical data near prospective surface facilities in Midway Valley, Yucca Mountain Project, Nye County, Nevada; Yucca Mountain Site Characterization Project

Arid

DOI	10.2172/138442
报告编号	SAND--90-2491
来源ID	OSTI_ID: 138442
	Summary and evaluation of existing geological and geophysical data near prospective surface facilities in Midway Valley, Yucca Mountain Project, Nye County, Nevada; Yucca Mountain Site Characterization Project
	Gibson, J.D. [Sandia National Labs., Albuquerque, NM (United States)]; Swan, F.H.; Wesling, J.R.; Bullard, T.F.; Perman, R.C.; Angell, M.M.; DiSilvestro, L.A. [Geomatrix Consultants, Inc., San Francisco, CA (United States)]
英文摘要	Midway Valley, located at the eastern base of the Yucca Mountain in southwestern Nevada, is the preferred location of the surface facilities for the potential high-level nuclear waste repository at Yucca Mountain. One goal in siting these surface facilities is to avoid faults that could produce relative displacements in excess of 5 cm in the foundations of the waste-handling buildings. This study reviews existing geologic and geophysical data that can be used to assess the potential for surface fault rupture within Midway Valley. Dominant tectonic features in Midway Valley are north-trending, westward-dipping normal faults along the margins of the valley: the Bow Ridge fault to the west and the Paintbrush Canyon fault to the east. Published estimates of average Quaternary slip rates for these faults are very low but the age of most recent displacement and the amount of displacement per event are largely unknown. Surface mapping and interpretive cross sections, based on limited drillhole and geophysical data, suggest that additional normal faults, including the postulated Midway Valley fault, may exist beneath the Quaternary/Tertiary fill within the valley. Existing data, however, are inadequate to determine the location, recency, and geometry of this faulting. To confidently assess the potential for significant Quaternary faulting in Midway Valley, additional data are needed that define the stratigraphy and structure of the strata beneath the valley, characterize the Quaternary soils and surfaces, and establish the age of faulting. The use of new and improved geophysical techniques, combined with a drilling program, offers the greatest potential for resolving subsurface structure in the valley. Mapping of surficial geologic units and logging of soil pits and trenches within these units must be completed, using accepted state-of-the-art practices supported by multiple quantitative numerical and relative age-dating techniques.
出版年	1992
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	05 NUCLEAR FUELS ; 58 GEOSCIENCES ; YUCCA MOUNTAIN ; GEOLOGIC SURVEYS ; GEOPHYSICAL SURVEYS ; HIGH-LEVEL RADIOACTIVE WASTES ; UNDERGROUND DISPOSAL ; RADIOACTIVE WASTE FACILITIES ; TECTONICS ; STRATIGRAPHY ; GEOLOGIC STRATA ; SITE CHARACTERIZATION ; MAPPING ; SEISMICITY ; SLIP ; STRUCTURAL MODELS ; Yucca Mountain Project
URL	http://www.osti.gov/scitech/servlets/purl/138442
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/260281
推荐引用方式 GB/T 7714	Gibson, J.D. [Sandia National Labs., Albuquerque, NM ,Swan, F.H.,Wesling, J.R.,et al. Summary and evaluation of existing geological and geophysical data near prospective surface facilities in Midway Valley, Yucca Mountain Project, Nye County, Nevada; Yucca Mountain Site Characterization Project,1992.