EARTHQUAKES:
Worldwide Earthquakes (United States Geological Survey - USGS)
Recent Earthquakes in California and Nevada (USGS)
Bay Area Shaking Hazard Maps (Association of Bay Area Governments - ABAG)
Bay Area Earthquake Hazards (USGS)
Bay Area Liquefaction Hazard Maps (ABAG)
California Seismic Hazard Zones (California Geological Survey - CGS, formerly California Division of Mines and Geology)
Soil Liquefaction (University of Washington)

LANDSLIDES:
Landslides - General Information (USGS)
National Landslide Information Center (USGS)
Bay Area Landslide Maps (USGS)
Landslide Recognition and Safety Guidelines (USGS)

RAINFALL INFORMATION:
Bay Area Rainfall Information (National Weather Service)
California Rainfall Maps (California Department of Water Resources)
General Weather Information (Golden Gate Weather Service)

HISTORIC MAPS AND PHOTOGRAPHS:
San Francisco Historical Maps
Panoramic Historic Maps - San Francisco and others
Panoramic Historic Maps - Berkeley, Oakland, and others
Historic Air Photos (University of California - Berkeley)
Landslide Photographs (USGS)
Historic Creek Maps (Oakland Museum)
Geological Hazard Photographs (Geo-Tech Imagery)

OTHER:
Available Fill
Miscellaneous 'Pun' Sites

ORGANIZATIONS:
EERI
ABAG (Earthquake Data)
ASCE
SEAONC
USGS (General)
USGS (Bay Area)
CGS
CGEA