Sediment Thickness

Apr 3, 2017
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As part of the USGS's California State Waters Mapping Project, a 20-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Salt Point and Drakes Bay was generated from seismic-reflection data collected in 2009 (USGS activity (S-8-09-NC) supplemented with outcrop and geologic structure from DS 781. The resulting grid covers an area of approximately 717 sq km. The volume of sediment accumulated since the Last Glacial Maximum is approximately 6,800 million cubic meters. Contours at 2.5-meter intervals were derived from this grid.

A 50-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Bolinas and Pescadero was generated from seismic-reflection data collected in 2010 (USGS activity (S-15-10-NC)  and 2007 (F-2-07-NC) supplemented with outcrop and geologic structure as mapped by Watt and others (Sheet 8, Sheet 10). The resulting grid covers an area of approximately 550 sq km. The volume of sediment accumulated since the Last Glacial Maximum is  approximately 3,760 million cubic meters. Contours at 2.5-meter intervals were derived from this grid.

A 50-m grid of sediment thickness for the seafloor within the 3-nautical mile limit between Pigeon Point and Monterey was generated from seismic-reflection data collected in 2009 and 2012 (USGS activities S-15-10-NC, S-06-11-MB and S-N1-09-MB) supplemented with outcrop and geologic structure from DS 781. The resulting grid covers an area of approximately 860 sq km. The volume of sediment accumulated since the Last Glacial Maximum is approximately 5,600 million cubic meters. Contours at 2.5-meter intervals were derived from this grid.

For more information, see https://pubs.usgs.gov/ds/781/
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geoscientificinformation, sediment isopach, seismic-reflection data, sediment thickness, environment, oceans, marine geology, coastal geology
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