Quaternary Downloads Related to the San Francisco Bay Area
With heightened public awareness about earthquake hazards leading up to the
100th anniversary of the 1906 San Francisco earthquake, the U.S. Geological
Survey (USGS) is releasing new maps of the San Francisco Bay Area designed
to give residents and others a new look at the geologic history and hazards
of the region. The "Map of Quaternary-active faults in the San
Francisco Bay Region" shows faults that have pushed up mountains and
generated earthquakes over the past 2 million years, and are likely to be
the source of the next major earthquake in the region. The map also
includes answers to common questions about faults. Printed versions of the
maps will be available for $7 each from USGS Information Services, 1-888-ASK-USGS.
Map of Quaternary-active faults in the San Francisco Bay Region.
(click to enlarge - new window)
Download Options for the Map of Quaternary-Active Faults in the San
Francisco Bay Region:
(some files may require the Adobe
Acrobat Reader ,
Earth™ software )
Download Poster as PDF (high-resolution poster - 63 MB, standard resolution poster - 6.4 MB)
- Full-size image (100 dpi JPG - 13.9 MB)
- Google Earth™ version (KMZ - 1.1 MB)
In Google Earth™ it is possible to view the faults at much greater scale
than that intended by the authors. This gives an impression of greater
accuracy than is actually present in the map. These files are for visualizing
the faults at regional scale only, and should not be used in any way
for earthquake hazard evaluation. If you can see individual buildings
in Google Earth™ (closer than an "eye altitude" of about 10
miles) you have gone beyond the accuracy that is present in the map.
Also, Google Earth™ does not enable differentiation of concealed faults.
Several Quaternary-active faults in the northeastern part of the region
do not break the Earth's surface. These "blind" faults
are shown in the original fault map as dotted