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Title Geologic, geophysical, and in-situ stress investigations in the vicinity of the Dining Car chimney, Dining Car/Hybla Gold Drifts, Nevada Test Site
Creator/Author Townsend, D.R. ; Baldwin, M.J. ; Carroll, R.D. ; Ellis, W.L. ; Magner, J.E.
Publication Date1982 Jan 01
OSTI IdentifierOSTI ID: 5103999; DE82012239
Report Number(s)USGS-OFR-82-137
DOE Contract NumberAI08-76DP00474
Resource TypeTechnical Report
Resource RelationPortions of document are illegible
Research OrgFenix and Scisson, Inc., Mercury, NV (USA); Geological Survey, Denver, CO (USA)
Subject450200 -- Military Technology, Weaponry, & National Defense-- Nuclear Explosions & Explosives ;580100 -- Geology & Hydrology-- (-1989) ;580200 -- Geophysics-- (-1989); ;DINING CAR EVENT-- SEISMIC WAVES;GEOLOGIC STRUCTURES-- BLAST EFFECTS;NEVADA TEST SITE-- GEOLOGICAL SURVEYS;NEVADA TEST SITE-- GEOPHYSICAL SURVEYS;NUCLEAR EXPLOSIONS-- SITE SELECTION;UNDERGROUND EXPLOSIONS-- SITE SELECTION; ROCK MECHANICS
Related SubjectBEDROCK PROJECT;EXPLOSIONS;MECHANICS;NATIONAL ORGANIZATIONS;NUCLEAR EXPLOSIONS;SURVEYS;UNDERGROUND EXPLOSIONS;US DOE;US ORGANIZATIONS
Description/Abstract The Hybla Gold event, detonated on Nov.^1, 1977, was conducted in the U12e.20 drifts of the E-tunnel complex beneath the surface of Rainier Mesa at the Nevada Test Site.^Though the proximity of the Hybla Gold working point to the chimney of the Dining Car event was important to the experiment, the observable geologic effects from Dining Car on the Hybla Gold site were minor.^Overburden above the working point is approximately 385 m (1263 ft).^The pre-Tertiary surface, probably quartzite, lies approximately 254 m (833 ft) below the working point.^This report comprises three chapters detailing the geologic, geophysical, and in situ stress data gathered in the period January through June 1977, in the course of mining and drilling in the Hybla Gold/Dining Car region.^These investigations confirm several observations reported previously for the Rainier event, i.e., a zone of microfailure observable in thin-section and in physical properties exists adjacent to the chimney.^In addition, however, a number of investigations add new information to our understanding of effects near the detonation point.^Shear waves were found to be highly diagnostic in the microcracked zone near the chimney as well as zones of failure at greater range not discernible as well as zones of failure at greater range not discernible by other techniques.^Extensive in situ stress measurements made by the hydrofracture and overcore techniques indicate changes in the orientation and magnitude of the pre-Dining Car stress field.^The hydrofracture technique further suggests pronounced gradients in minimum stress magnitudes over short distances at some locations in the postshot stress regime.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 148
AvailabilityNTIS, PC A07/MF A01.
System Entry Date2001 May 13

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