Liquefaction Zones ECA

A polygon feature class that shows liquefaction zones. Used to implement and regulate the City of Seattle's Environmentally Critical Areas policies. This layer was created in 1995 using data obtained from the USGS. Some edits were made to the edges to better coincide with the City's two foot contour data. Areas of the City subject to ground shaking from seismic hazards that are addressed by Title 22.

              The Seattle Fault zone as delineated in Troost et al., 2005,
              The geologic map of Seattle, a progress report, U.S. Geological Survey, Open-file
                 report 2005-1252
              , or as the Director determines is more accurately mapped by the U.S. Geological Survey,
              as set out in a Director's Rule. For more information on this code, please visit:https://library.municode.com/wa/seattle/codes/municipal_code?nodeId=TIT25ENPRHIPR_CH25.09REENCRARItem for the Seattle Hazard Explorer

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.seattle.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier https://data-seattlecitygis.opendata.arcgis.com/maps/SeattleCityGIS::liquefaction-zones-eca
issued 2012-06-29
landingPage https://data-seattlecitygis.opendata.arcgis.com/maps/SeattleCityGIS::liquefaction-zones-eca
metadata_type geospatial
modified 2022-06-09
old-spatial -122.4308,47.4956,-122.2470,47.7349
publisher City of Seattle GIS Program
resource-type Dataset
source_datajson_identifier true
source_hash 4b38d8a26a55d770756e775d2b64e890de0fea5b
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-122.4308, 47.4956], [-122.4308, 47.7349], [-122.2470, 47.7349], [-122.2470, 47.4956], [-122.4308, 47.4956]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • ckan
  • contours
  • cosgis
  • department-of-planning-and-development
  • eca
  • environment
  • environmental-critical-areas
  • geo
  • geoss
  • liquefaction
  • national
  • north-america
  • seattle
  • seattlecitygis
  • united-states
  • wa
  • wmdpdecaliqzones
  • zones
isopen False
license_id notspecified
license_title License not specified
maintainer site.admin_SeattleCityGIS
maintainer_email mapgis.mapgis@seattle.gov
metadata_created 2025-11-22T22:49:13.424975
metadata_modified 2025-11-22T22:49:13.424979
notes <div><span><div>A polygon feature class that shows liquefaction zones. Used to implement and regulate the City of Seattle's Environmentally Critical Areas policies. This layer was created in 1995 using data obtained from the USGS. Some edits were made to the edges to better coincide with the City's two foot contour data.</div><div><p> Areas of the City subject to ground shaking from seismic hazards that are addressed by<a href='https://library.municode.com/wa/seattle/codes/municipal_code?nodeId=TIT22BUCOCO' rel='nofollow ugc'><span></span> Title 22</a>. </p> <p> The Seattle Fault zone as delineated in Troost et al., 2005, <span>The geologic map of Seattle, a progress report, U.S. Geological Survey, Open-file report 2005-1252</span> , or as the Director determines is more accurately mapped by the U.S. Geological Survey, as set out in a Director's Rule. <br /></p>For more information on this code, please visit:<br />https://library.municode.com/wa/seattle/codes/municipal_code?nodeId=TIT25ENPRHIPR_CH25.09REENCRAR</div><div><br /></div><div>Item for the Seattle Hazard Explorer</div></span></div>
num_resources 6
num_tags 20
title Liquefaction Zones ECA