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Brief Report for Fish Lake Valley fault zone, Cucomongo section (Class A) No. 49d

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Compiled in cooperation with the California Geological Survey

citation for this record: Reheis, M.C., compiler, 1994, Fault number 49d, Fish Lake Valley fault zone, Cucomongo section, in Quaternary fault and fold database of the United States: U.S. Geological Survey website, http://earthquakes.usgs.gov/hazards/qfaults, accessed 07/31/2014 11:44 PM.

Synopsis General: Major structure consisting of a long zone of right-oblique and normal faults and subsidiary left-lateral faults and thrust faults that extend mainly north from the Northern Death Valley fault zone [114] from California into western Nevada. Most of the fault has been mapped at 1:24,000 scale and trenching has been conducted on the Leidy Creek [49a] and Oasis [49c] sections of the fault zone, but not in the Wildhorse Creek [49b] and Cucomongo Canyon [49d] sections, which border Death Valley National Park. The entire fault zone has been active, repeatedly, in the latest Quaternary (<15 ka), with some sections having evidence for late Holocene surface rupturing. Slip rates are typically 1-5 mm/yr, but exceed 5 mm/yr along the Oasis section. This fault zone is one of the most active in the western Basin and Range province.

Sections: This fault has 4 sections. The sections are modified from those defined by Brogan and others and by Sawyer who called them subzones, on the basis of distinct differences in fault strike and faulting style and possible differences in the timing of the most recent event along the fault zone. The Leidy Creek and Wildhorse Creek sections are the same as Brogan and others' Chiatovich Creek and Dyer sections and Sawyer's "northern" and "Dyer" subzones. The Oasis section includes the Oasis and Horsethief Canyon sections of Brogan and others, and combines the "eastern" and "western" subzones (parallel fault strands) of Sawyer into one section. The Cucomongo Canyon section is the same as that of Brogan and others.
County(s) and State(s) INYO COUNTY, CALIFORNIA
Physiographic province(s) BASIN AND RANGE
Length (km) This section is 33 km of a total fault length of 99 km.
Average strike N38°W (for section) versus N15°W (for whole fault)
Sense of movement Dextral
Dip Direction SE; N
Historic earthquake
Most recent prehistoric deformation Latest Quaternary (<15 ka)
Slip-rate category Between 1.0 and 5.0 mm/yr
Date and Compiler(s) 1994
Marith C. Reheis, U.S. Geological Survey