Bay Area Liquefaction Hazards

	ABAG Liquefaction Maps and Information

	Based on ABAG report - "The REAL Dirt on Liquefaction"

When the ground liquefies in an earthquake, sandy or silty materials saturated with water behave like a liquid, causing pipes to leak, roads and airport runways to buckle, and building foundations to be damaged.

Liquefaction SUSCEPTIBILITY Maps	Liquefaction HAZARD Maps
Liquefaction SUSCEPTIBILITY maps show areas with water-saturated sandy and silty materials.	Liquefaction HAZARD maps show areas where the ground is susceptible to liquefaction AND that are likely to be shaken hard enough in a particular earthquake to trigger liquefaction.
Interactive SUSCEPTIBILITY Map - "Zoom in" capability! (Allow pop-ups to ensure that you can zoom in by city or address)	Interactive HAZARD Maps for Individual Earthquake Scenarios- "Zoom in" capability! (Allow pop-ups to ensure that you can zoom in by city or address)
	"Static" Maps of Liquefaction HAZARD in the Bay Area for future earthquake scenarios (showing local streets)

Interactive (GIS) Maps Showing Liquefaction Seismic Hazards Areas - "Zoom in" capability! (Allow pop-ups to ensure that you can zoom in by city or address) - courtesy of the California Geological Survey - More Info from CGS

WHAT IS LIQUEFACTION?

Excerpts from the ABAG Report - "The REAL Dirt on Liquefaction"

Background
Introduction - Potential Effects of Liquefaction
PART I - What Happens to the Ground?
PART II - When Does Liquefaction Occur?
PART III - What Happens to Our Built Environment?
What can you do next?
References
Credits
Purchasing ABAG's New Liquefaction Report, "The REAL Dirt on Liquefaction"

TIPS for Living with Liquefaction

The following are links to Adobe Acrobat files. If you do not already have this FREE software, you can download it directly from Adobe with this link.

REPORT - Download Entire Main Document - The REAL Dirt on Liquefaction

APPENDICES - Download This Supplementary Volume

Technical Appendix (pdf) - Cover and Credits

Technical Appendix A (pdf) - Liquefaction Susceptibility Mapping Approach

Technical Appendix B (pdf) - The Process of Developing Liquefaction Hazard Maps

Technical Appendix C (pdf) - Collection and Analysis of Liquefaction Data from the Northridge and Loma Prieta Earthquakes

INFORMATION AVAILABLE FROM OTHERS

USGS - Bay Area Map and Full Technical Documentation of Liquefaction Susceptibility (The map does not show streets or highways.) ATTN GIS Users - The GIS file of liquefaction susceptibility can be downloaded at this site.
USGS - More Detailed Maps of Liquefaction Hazard and Shaking Amplification for Berkeley, Emeryville, Oakland, and Piedmont (Released in August 2002)
California Geological Survey (formerly CDMG) Liquefaction Information and Maps Showing Zones of Required Investigation (including portions of Alameda and Santa Clara counties and ALL of San Francisco)
ABAG Information on Airports and Earthquakes (focusing on liquefaction and runways)
CDMG/SCEC Technical Liquefaction Information for Engineering (Adobe Acrobat File) - "Recommended Procedures for Implementation of DMG Special Publication 117 - Guidelines for Analyzing and Mitigating Liquefaction Hazards in California"

The writing and production of "The REAL Dirt on Liquefaction" reports and maps were funded by Grant Nos. 1434-HQ-97-GR-03048 and 1434-HQ-97-GR-03121 from the U.S. Geological Survey (USGS), as well as by the Association of Bay Area Governments and William Lettis & Associates. Any opinions, findings, conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the funding agencies. ABAG, the Association of Bay Area Governments, is the regional planning and services agency for the nine-county San Francisco Bay Area. Source: "The REAL Dirt on Liquefaction" documentation prepared by ABAG in 2001.

Last modified 10/5/09 by jbp.