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Open-File Report 02-162

Multibeam Mapping of the Los Angeles, California Margin

By James V. Gardner and Peter Dartnell

Perspective view of the Los Angeles Margin looking north over San Pedro Bay. The distance across the bottom of the image is about 17 km with a vertical exaggeration of 6x.Introduction

The Los Angeles, California Margin was mapped using multibeam echosounders during three separate surveys (Figure 1). In 1996, the USGS surveyed the shelf and slope in Santa Monica Bay from Pt. Dume to south of the Palos Verdes Peninsula. The mapping was accomplished using a Kongsberg Simrad EM1000 multibeam sonar system that provided high-quality bathymetry and quantitative backscatter. In 1998, the USGS continued the mapping to the south and surveyed the outer shelf, slope, and proximal basin off Long Beach and Newport using a Kongsberg Simrad EM300 multibeam sonar system. In 1999, the Los Angeles Margin mapping was completed with the surveying of the inner Long Beach shelf from the Palos Verdes Peninsula, south to Newport. This survey used a dual Kongsberg Simrad EM3000D multibeam sonar system.

These three surveys were conducted to support USGS projects studying marine pollution and geohazards along the Los Angeles Margin.

First posted February 15, 2002

For additional information, contact:
Contact Information, Pacific Coastal and Marine Science Center
U.S. Geological Survey
Pacific Science Center
400 Natural Bridges Drive
Santa Cruz, CA 95060

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Suggested citation:

Gardner, James V., Dartnell, Peter, 2002, Multibeam Mapping of the Los Angeles, California Margin: U.S. Geological Survey Open-File Report 02-162,


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