ECA - Liquefaction Prone Area

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.
Organization: City of Seattle
Organization URL: https://catalog.data.gov/organization/seattle-wa
Last updated: 2026-02-17
Tags: eca, environmental, landuse, planning, sdci, seattle gis open data, terrain