Offshore survey provides answers to coastal stability and potential offshore extensions of landslides into Abalone Cove, Palos Verdes peninsula, Calif
- Humboldt State Univ., San Diego, CA (United States)
- Slosson and Associates, Van Nuys, CA (United States)
The configuration and stability of the present coast line near Abalone Cove, on the south side of Palos Verdes Peninsula, California is related to the geology, oceanographic conditions, and recent and ancient landslide activity. This case study utilizes offshore high resolution seismic profiles, side-scan sonar, diving, and coring, to relate marine geology to the stability of a coastal region with known active landslides utilizing a desk top computer and off-the-shelf software. Electronic navigation provided precise positioning that when applied to computer generated charts permitted correlation of survey data needed to define the offshore geology and sea floor sediment patterns. A mackintosh desk-top computer and commercially available off-the-shelf software provided the analytical tools for constructing a base chart and a means to superimpose template overlays of topography, isopachs or sediment thickness, bottom roughness and sediment distribution patterns. This composite map of offshore geology and oceanography was then related to an extensive engineering and geological land study of the coastal zone forming Abalone Cove, an area of active landslides. Vibrocoring provided ground sediment data for high resolution seismic traverses. This paper details the systems used, present findings relative to potential landslide movements, coastal erosion and discuss how conclusions were reached to determine whether or not onshore landslide failures extend offshore.
- OSTI ID:
- 5420766
- Report Number(s):
- CONF-9305259-; CODEN: GAAPBC
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Vol. 25:5; Conference: 89. annual meeting of the Cordilleran Section and the 46th annual meeting of the Rocky Mountain Section of the Geological Society of America (GSA), Reno, NV (United States), 19-21 May 1993; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALIFORNIA
CONTINENTAL SHELF
SHORES
SEISMIC SURVEYS
EROSION
LANDSLIDES
COMPUTER CODES
COMPUTERIZED SIMULATION
DATA ANALYSIS
MARINE SURVEYS
OFFSHORE SITES
PACIFIC OCEAN
SLOPE STABILITY
COASTAL REGIONS
CONTINENTAL MARGIN
DEVELOPED COUNTRIES
GEOPHYSICAL SURVEYS
NORTH AMERICA
SEAS
SIMULATION
STABILITY
SURFACE WATERS
SURVEYS
USA
580000* - Geosciences