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.