Seismic Landslide Hazard for the Cities of Oakland and Piedmont, California

This map describes the possible hazard from earthquake-induced landslides for the cities of Oakland and Piedmont, CA. The hazard depicted by this map was modeled for a scenario corresponding to an M=7.1 earthquake on the Hayward, CA fault. This scenario magnitude is associated with complete rupture of the northern and southern segments of the Hayward fault, an event that has an
estimated return period of about 500 years. The modeled hazard also corresponds
to completely saturated ground-water conditions resulting from an extreme storm
event or series of storm events. This combination of earthquake and
ground-water scenarios represents a particularly severe state of hazard for
earthquake-induced landslides. For dry ground-water conditions, overall hazard
will be less, while relative patterns of hazard are likely to change.