GH Geologic Hazards Overlay District. The intent of the geologic hazards overlay district is to provide for suitable protection for areas subject to the threat of loss, life, and/or personal property due to seismic shaking and resultant ruptures or ground failure, landslides, and other potential geologic hazards. More specifically, this overlay district will allow the city to exercise the mandated approval authority within special study zones as established by the state geologist required by the provisions of the Geologic Hazards Zones Act (Chapter 7.5, Division 2, of the California Public Resources Code). This overlay district implements various general plan land use designations.