Liquefaction Hazard Maps
Northwestern Alameda County
This map shows the liquefaction hazard in the communities of Alameda, Berkeley, Emeryville, Oakland, and Piedmont for a magnitude 7.1 earthquake on the Hayward fault. The map predicts the approximate percentage of each designated area that will liquefy and show surface manifestations of liquefaction such as sand boils and ground cracking. Liquefaction is a phenomenon that is caused by earthquake shaking. Wet sand can become liquid-like when strongly shaken. The liquefied sand may flow and the ground may crack and move causing damage to surface structures and underground utilities. The map depicts the hazard at a regional scale and should not be used for site-specific design and consideration. Subsurface conditions can vary abruptly and borings are required to address the hazard at a given location.
- Shaking Hazard Map for Northwestern Alameda County
- Complete USGS Open-file Report 02-296 includes full text and spatial database files.
- Cone Penetration Testing (CPT) data for Alameda County
- CGS Seismic Hazard Zone Maps