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U.S. Geological Survey Open-File Report 2010-1149

Preliminary Atlas of Active Shallow Tectonic Deformation in the Puget Lowland, Washington

Compiled by Elizabeth A. Barnett, Ralph A. Haugerud, Brian L. Sherrod, Craig S. Weaver, Thomas L. Pratt, and Richard J. Blakely

ABSTRACT

Thumbnail of and link to report PDF (15.1 MB)

This atlas presents an up-to-date map compilation of the geological and geophysical observations that underpin interpretations of active, surface-deforming faults in the Puget Lowland, Washington. Shallow lowland faults are mapped where observations of deformation from paleoseismic, seismic-reflection, and potential-field investigations converge. Together, results from these studies strengthen the identification and characterization of regional faults and show that as many as a dozen shallow faults have been active during the Holocene. The suite of maps presented in our atlas identifies sites that have evidence of deformation attributed to these shallow faults. For example, the paleoseismic-investigations map shows where coseismic surface rupture and deformation produced geomorphic scarps and deformed shorelines. Other maps compile results of seismic-reflection and potential-field studies that demonstrate evidence of deformation along suspected fault structures in the subsurface. Summary maps show the fault traces derived from, and draped over, the datasets presented in the preceding maps. Overall, the atlas provides map users with a visual overview of the observations and interpretations that support the existence of active, shallow faults beneath the densely populated Puget Lowland.

  • Report PDF (15.1 MB)
  • Maps folder. This folder contains the 14 maps, most of which are ~11"x17". Also, all of the maps are provided as a single large PDF (256 MB total)
  • This report is available only on the Web.

For additional information:
Contact Information, Earthquake Science Center, Seattle, Washington Field Office
U.S. Geological Survey
Dept. Earth & Space Sciences
University of Washington, Box 351310
Seattle, WA 98195-1310
http://earthquake.usgs.gov/

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Suggested citation:

Barnett, Elizabeth A., Haugerud, Ralph A., Sherrod, Brian L., Weaver, Craig S., Pratt, Thomas L., and Blakely, Richard J., compilers, 2010, Preliminary atlas of active shallow tectonic deformation in the Puget Lowland, Washington: U.S. Geological Survey Open-File Report 2010-1149, 32 p., 14 maps



Contents

Abstract

Introduction

Tectonic Framework of Puget Lowland Shallow Faults

Active Faults Identified by Recent Geophysical and Geological Field Projects

The Maps

Active Shallow Fault Locations: Confluence of Geological and Geophysical

Data

Acknowledgments

References Cited

14 maps


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