[1] Since the 1960s, when it was known as the California Division of Mines and Geology, CGS has produced many maps that depict landslide features and potential slope-failure areas.
[3] CGS has a legislatively mandated Seismic Hazards Zonation Program that produces regulatory maps areas where the probability of liquefaction and earthquake-triggered landslides are significant enough to require site evaluation prior to most developments.
[2] The State of California Department of Conservation produces regulatory maps showing locations where the hazard from earthquake-triggered landslides must be evaluated prior to specific types of land-use development in accordance with provisions of Public Resources Code, Section 2690 et seq.
[4] Watershed maps, used in the review of timber harvest plans (regulated by the California Department of Forestry) are available for downloading in PDF and GIS data formats.
Though of high quality and designed for land-use planning purposes, the Act did not require local governments to use the maps.