This point shapefile shows areas that liquefied in the 1906 San Francisco or 1989 Loma Prieta earthquake as mapped by Youd and Hoose (1978) and Tinsley and others (1998). This layer is part of a collection describing Geology resources and constraints Monterey County, California. The purpose of this data set is to document sites of previous liquefaction. Rosenberg, Lewis I. (2001). Historical Liquefaction Localities, Monterey County, California, 1906, 1989. Monterey County (Calif.) Planning Department. Available at: http://purl.stanford.edu/mj454vv0325. The intended resolution of this data set is 1:250,000. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.