Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content
  • Feedback
    • This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

    ECA Liquefaction Prone Areas

    Metadata Updated: February 28, 2025

    Displays areas with liquefaction zones.A polygon feature class that shows liquefaction zones. Used to implement and regulate the City of Seattle's Environmentally Critical Areas (ECA) 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 about the definition of liquefaction zones, see Seattle Municipal Code section 25.09.012, Environmentally Critical Areas (ECA) definitions. Updated as needed.

    Access & Use Information

    Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

    Downloads & Resources

    Dates

    Metadata Created Date July 16, 2023
    Metadata Updated Date February 28, 2025

    Metadata Source

    Harvested from Seattle JSON

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date July 16, 2023
    Metadata Updated Date February 28, 2025
    Publisher City of Seattle ArcGIS Online
    Maintainer
    Identifier https://www.arcgis.com/home/item.html?id=54d60c326ede4a7eba5eb974c1156fd1&sublayer=5
    Data First Published 2023-07-11
    Data Last Modified 2024-08-08
    Category geospatial
    Public Access Level public
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://cos-data.seattle.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 223ac70b-6243-4ec3-abf0-bad709d58d3e
    Harvest Source Id f61de7a2-69cf-40a9-a1bc-dd9edb8f3fe5
    Harvest Source Title Seattle JSON
    Homepage URL https://data-seattlecitygis.opendata.arcgis.com/datasets/SeattleCityGIS::eca-liquefaction-prone-areas-1
    Metadata Type geospatial
    Old Spatial -122.4308,47.4934,-122.2421,47.7359
    Source Datajson Identifier True
    Source Hash a6c11fe597ffcdb116767679dcb8dc382dfcc4d257a3cfb034059649574ef92c
    Source Schema Version 1.1
    Spatial {"type": "Polygon", "coordinates": -122.4308, 47.4934, -122.4308, 47.7359, -122.2421, 47.7359, -122.2421, 47.4934, -122.4308, 47.4934}

    Didn't find what you're looking for? Suggest a dataset here.