Preshot Geologic and Engineering Properties Investigations
Abstract
The Pre-Schooner II site was selected, from five areas investigated, on the basis of refraction seismic surveying, core drilling, and surface mapping in-extrusive igneous rock that generally models the nearby Schooner site. Bedrock below about 5 feet of stony silt consists of a 25-foot-thick layer of vitrophyre and vitrophyre breccia over felsite that extends to a depth of at least 150 feet. These two bedrock layers at the site have distinctly different physical properties, the felsite being relatively less porous and stronger in compression than the overlying vitrophyre. The felsite is massive at depth, although highly fractured, but it becomes steeply flow-layered in the upper portion. The flow layers continue across a gradational zone into the overlying vitrophyre. The resultant structure strikes about north 35 degrees east. The felsite is conspicuously jointed, and the vitrophyre contains abundant microscopic cracks.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1967
- Accession Number
- ADA384996
Entities
People
- F. E. Girucky
- J. R. Curro Jr
- R. J. Lutton
- R. W. Hunt