The data files found on this page are the OFFICIAL versions of the Liquefaction Hazard Zones adopted by the Santa Clara County Board of Supervisors on February 26, 2002. The map images found on this page were derived from the adopted data files. They are subject to periodic revisions. Revisions were made to the County Liquefaction Hazard Zones following the release of the Official Seismic Hazard Zones Maps by the State of Califorina through October 18, 2006. The map images downloadable from this page were derived from the adopted and updated data files.

Download/View Single Map Sheets

Download/View Entire Atlas of Maps

Download GIS Data

Download/View Single Map Sheets

The Liquefaction Hazard Zones Maps are in PDF format. The .pdf format allows users to zoom in and view additional detail, without any loss of quality from the original map. Maps are 8.5x14 inches, which allows for printing on regular printers using legal size paper.

Detailed Map Index (PDF)

Find the map sheet you wish to view and click on the corresponding map number in the simple index map below. This selection will download the appropriate PDF document.

Note: Some maps were revised to reflect updates to State Zones through October 18, 2006.

Some map sheets do not have hazard zones within their limits.

Download/View the Atlas of the Liquefaction Hazard Zones Maps

Note: Atlas revised to reflect updates to State Zones through October 18, 2006.

If you would like to download the Atlas (78 pages, including the detailed index map) of the Liquefaction Hazard Zones Maps, click below.

Liquefaction Hazard Zones Atlas   (PDF - WARNING: 84MB)

Download GIS Data of Liquefaction Hazard Zones

Note: Data revised to reflect updates to State Zones through October 18, 2006.

The data files are ArcView Shapefiles contained in a zip archive. They are in standard projection for California State Plane, Zone 3, NAD 83, units U.S. Feet. After downloading, the user must unzip the archive to use the data files. The data files are intended for use by experienced GIS professionals. Therefore, NO TECHNICAL SUPPORT SHALL BE PROVIDED. If you would like to download the zipped Liquefaction Hazard Zone GIS Data, click below.