Book Chapter
Estimating rocky seafloor extent on the Southern California continental shelf
Author(s)
Guy R. Cochrane
;
Guy R. Cochrane
U.S. Geological Survey, 400 Natural Bridges Drive, Santa Cruz, California 95060, USA
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H. Gary Greene
H. Gary Greene
Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, California 95039, USA
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Published:January 01, 2009
High-resolution sonar data are necessary to map bottom substrate for habitat studies but are lacking over much of the continental shelf. With such data, areas covered by sediment can be distinguished from bedrock areas with an accuracy of ~90%. Without these data, the extent of sediment as thick as 10 m cannot be resolved, and estimates of the extent of rocky seafloor are exaggerated. A study area north of Anacapa Island in Southern California interpreted as a large rocky area after mapping with low-resolution seismic systems was found to have exposed rocky bottom in only 10% of the area when...
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GSA Special Papers
Earth Science in the Urban Ocean: The Southern California Continental Borderland
Author(s)
Homa J. Lee;
Homa J. Lee
U.S. Geological Survey, Menlo Park, California, USA
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William R. Normark
William R. Normark
U.S. Geological Survey, Menlo Park, California, USA
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Geological Society of America

Volume
454
Copyright:
© 2009 Geological Society of America
Attribution: You must attribute the work in the manner specified by the author or licensor (but no in any way that suggests that they endorse you or your use of the work). Noncommercial ‒ you may not use this work for commercial purpose. No Derivative works ‒ You may not alter, transform, or build upon this work. Sharing ‒ Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.
ISBN print:
9780813724546
Publication date:
January 01, 2009
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Index Terms/Descriptors
- acoustical methods
- bedrock
- bottom features
- California
- Channel Islands
- classification
- continental borderland
- continental shelf
- East Pacific
- geophysical methods
- geophysical surveys
- high-resolution methods
- igneous rocks
- image analysis
- mapping
- North Pacific
- Northeast Pacific
- outcrops
- Pacific Ocean
- sedimentary rocks
- sonar methods
- Southern California
- surveys
- United States
- volcanic rocks
- Anacapa Island
Latitude & Longitude
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