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Open-File Report 98-249

Compilation of 29 Sonic and Density Logs from 23 Oil Test Wells in Western Washington State

By Thomas M. Brocher and April L. Ruebel

Thumbnail of and link to report PDF (2 MB)Abstract

Three-dimensional velocity models for Puget Sound provide a means for better understanding the lateral variations in strong ground motions recorded during local earthquakes in Puget Lowland. We have compiled 29 sonic and density logs from 23 oil test wells to help us determine the geometry and physical properties of the Cenozoic basins in western Washington. The maximum depths sampled by the test wells are between 0.47 and 4.04 km. These well logs sample Quaternary to Eocene sedimentary and volcanic rocks. This report presents the locations, elevations, depths, stratigraphic and other information about the test wells, and provides plots showing the density and sonic velocities as a function of depth for each well log. We also present two-way travel times calculated from the sonic velocities.

First posted October 30, 2003

For additional information, contact:
Earthquake Science Center, Menlo Park
U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, CA 94025-3591

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Suggested citation:

Brocher, T. M., Ruebel, A. L., 1998, Compilation of 29 Sonic and Density Logs from 23 Oil Test Wells in Western Washington State: U. S. Geological Survey Open-File Report 98-249, 60 pp.,

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