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Pacific Northwest Geologic Mapping and Urban Hazards

Pacific Northwest geologic mapping and urban hazards
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Lifelines and earthquake hazards in the greater Seattle area

Lifeline systems
Earthquake hazards
About the map
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About the Map

View 66kb simplified Lifelines map
View 266 kb full-color Lifelines map
View 1.2 MB poster-sized, high resolution map
View 2.0 MB poster-sized, printable PDF file
View 1.5 MB page-sized, printable PDF file

The base map was derived from standard USGS 10-meter digital elevation models (DEMs), supplemented with LIDAR data (courtesy of Kitsap County) for Bainbridge Island. Shorelines and streams are from USGS digital line graphs (DLGs) derived from standard 1:100,000-scale maps (see

The extent of unconsolidated young (Holocene) deposits is simplified from an unpublished digital geologic compilation by Haugerud. Primary sources for this compilation are USGS 1:100,000-scale mapping in the Cascade foothills (R.W. Tabor, USGS, personal communication), Washington Division of Geology and Earth Resources 1:100,000-scale compilation maps (J. Eric Schuster, WDGER, personal communication), and an unpublished compilation map of King County (Derek Booth, King County, personal communication). The extent of possible rupture along the Seattle fault zone was estimated by Haugerud from the extent of past faulting and topography. The limit of buried young sedimentary rocks of the Seattle basin was interpreted by Richard Blakely (USGS, personal communication) from geophysical surveys.

We thank Ken Conradi (City of Seattle) Michael Jenkins (King County), Louis Kempner and Bob White (Bonneville Power Administration), Kurt Myking (City of Tacoma), and Kathy Reed (Olympic Pipeline Company), for assistance with digital and paper map data on the locations of lifelines. Rail lines and natural gas pipelines are from USGS DLG data.

This report is a joint effort by the U.S. Geological Survey and EQE International. Work by USGS staff was funded by the Earthquake Hazard Program, Urban Hydrologic and Geologic Hazard Initiative, and National Cooperative Geologic Mapping Program.

This site is maintained by the Pacific Northwest Urban Corridor Geologic Mapping Project, part of the Geology, Minerals, Energy and Geophysics Science Center

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