Geologic Data Sources

U.S. Geological Survey

San Francisco Bay Region Landslide Information

Recent U.S. Earthquakes

Earthquake Probabilities

California Geological Survey

California Geological Survey Regulatory Maps

City of Saratoga Geologic Maps

City of Saratoga Ground Movement Potential Map

Town of Los Altos Hills Geotechnical and Seismic Hazard Zones Map

Town of Portola Valley Geologic Map

Town of Portola Valley Ground Movement Potential Map

City of Cupertino Geologic and Seismic Hazard Zones Map

Geographic Information Systems

Santa Clara County Geographic Information System

San Mateo County Geographic Information System

Santa Cruz County Geographic Information System

Alameda County Parcel Viewer

Town of Los Gatos Geographic Information System


GeoForensics, Inc.

Milstone Geotechnical

Americal Soil Testing, Inc.

Steven Ray Hartsell, R.E.H.S., Septic System Design

Soil Tectonics


Access Soil Drilling

Cenozoic Exploration

Tri-Valley Drilling


Escaping A Killer Landslide Documentary

Earthquakes: Where The Fault Lies – San Andreas Fault & Hayward Fault

Riding The Storm

Debris Flow Landslide

Sea Cliff Erosion

More Sea Cliff Erosion


Guidelines For Evaluating And Mitigating Seismic Hazards In California

Guidelines For Evaluating Surface Fault Rupture In California

The Use Of Large-Diameter Boreholes And Downhole Logging Methods In Landslide Investigations

Professional Organizations

Association of Engineering Geologists

Geological Society of America