Factors affecting the recognition of faults exposed in exploratory trenches. Bulletin

Technical Report · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5195101

Bonilla, M G; Lienkaemper, J J

During excavation of the reactor shaft at the proposed Bodega Head nuclear reactor in California, a fault was found in the sediments overlying bedrock. This apparent lack of a complete connection with the bedrock fault led to disagreement as to whether the fault in the sediments was of tectonic or landslide origin. The report provides information on some of the conditions under which fault strands in trench walls are either difficult to see or die out, and the frequency of occurrence of these phenomena. Information is also provided on the widths of fault zones, on the deformation of the hanging wall and footwall of dip-slip faults, and on the frequency of occurrence of pebble rotation, open fissures, gouge, slickensides, mixing, fault breccia, fault rubble, crushing, polishing, water barriers, and liquefaction effects. Short summaries of information relating to fault strands that are poorly expressed or that die out have already been published (Bonilla and Lienkaemper, 1988, 1990).

• Research Organization: Geological Survey, Alexandria, VA (United States)
• OSTI ID: 5195101
• Report Number(s): PB-91-205344/XAB; USGS-BULL-1947
• Resource Relation: Other Information: Includes one sheet of 24X reduction microfiche. Library of Congress catalog card no. 90-14104
• Country of Publication: United States
• Language: English

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