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. 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.本数据集用于展示液化区分布范围，属于用于呈现液化区的多边形要素类。其用途为落实并规范西雅图市环境临界区（Environmentally Critical Areas, ECA）相关政策。该图层于1995年基于美国地质调查局（United States Geological Survey, USGS）获取的数据制作完成，并对边界进行了部分编辑，以更好匹配西雅图市2英尺等高线数据。本数据集覆盖西雅图市受地震灾害引发地面晃动影响的区域，相关要求已纳入第22章规制范畴。本数据集涵盖的西雅图断层带，以Troost等人2005年发表于《美国地质调查局公开报告2005-1252》的《西雅图地质图进度报告》中划定的范围为准，或依据局长规则中美国地质调查局发布的更为精准的测绘结果进行界定。如需了解液化区的详细定义，请参阅《西雅图市政法典》第25.09.012条“环境临界区（ECA）定义”。本数据集将按需进行更新。