Some faulting patterns in the eastern Santa Monica Mountains
Conference
·
· Geological Society of America, Abstracts with Programs; (United States)
OSTI ID:5290636
- GeoSoils, Inc., Van Nuys, CA (United States)
New 1:24,000 scale mapping of the eastern Santa Monica Mountains (SMM) indicates additional braiding, branching and sub parallel faults to the main trace of the 21 km-long northeast-trending Benedict Canyon fault (BCF), which displays over 2.5 km of left lateral strike slip separation. Some of the 1931 USGS Professional Paper 165-C geologic cross sections for the eastern portion of SMM have also been revised using the 1991 Dibble Geological Foundation Maps ([number sign]DF-30 and 31) along with additional data from individual study areas and some unpublished reports. The geometry of folding on both sides of the BCF is very similar and it indicates some mapped north-dipping faulting which are not related to the BCF occurred during folding of the Cretaceous to Middle Miocene sediments by either flexural-slip or by thrust faulting along one or more northwest-trending synclinoria prior to the upper Miocene. An unconformable contact separates the more folded Cretaceous to Middle Miocene rocks from the upper Miocene marine sediments. The entire eastern SMM has undergone later regional uplift along the east west anticlinorium which was later faulted by the BCF. The BCF zone is a significant ground water barrier in this mountainous urban region. To date several major surface and underground engineering projects are now planned to be located on or to be excavated through the Benedict Canyon fault.
- OSTI ID:
- 5290636
- Report Number(s):
- CONF-9305259--
- Conference Information:
- Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 25:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
CALIFORNIA
CENOZOIC ERA
CRETACEOUS PERIOD
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGY
GEOMETRY
GROUND WATER
HYDROGEN COMPOUNDS
MAPPING
MATHEMATICS
MESOZOIC ERA
MOUNTAINS
NORTH AMERICA
OXYGEN COMPOUNDS
TERTIARY PERIOD
USA
WATER
580000* -- Geosciences
CALIFORNIA
CENOZOIC ERA
CRETACEOUS PERIOD
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGY
GEOMETRY
GROUND WATER
HYDROGEN COMPOUNDS
MAPPING
MATHEMATICS
MESOZOIC ERA
MOUNTAINS
NORTH AMERICA
OXYGEN COMPOUNDS
TERTIARY PERIOD
USA
WATER