ABAG Shaken
Awake! Report
West Napa Earthquake
from
the 1996 report (NOT updated with 2003 data)
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ABAG Shaken
Awake! Report |
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from
the 1996 report (NOT updated with 2003 data)
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Regional Map of Ground Shaking Intensity from the West Napa Earthquake
This scenario earthquake is for a magnitude 6.7 earthquake on the West Napa fault in Napa County.
An event along the West Napa fault would cause the most severe damage in Napa County. Out of the total Bay Area uninhabitable units of 9,652, almost half (43%) would be in Napa County. San Francisco, Alameda, and Solano counties would share the majority of the rest of the damage.
As is the case with previous events, the older housing stock in Alameda and San Francisco counties would experience the most damage. In the more recently urbanized counties of Napa and Solano, on the other hand, most of the damage would be experienced by mobile homes and one-to-three story wood-frame buildings.
Napa County is clearly the hardest hit county in both gross numbers and percentages. Over twice as many people from Napa County are expected to be displaced than from San Francisco, and over three times than from Alameda County. Similarly, Napa County's peak shelter population is larger than Alameda and San Francisco counties combined. Over 40% of this event's displaced and peak shelter populations is expected to be from Napa County.
Within Napa County, 79% of the projected shelter population is a result of red-tagged dwelling units, and most (over 80% of the uninhabitable dwelling units) are either mobile homes or 1-3 story post-1939 multi-family buildings. These relationships alone are not enough to prove a correlation between uninhabitable mobile homes, multi-family dwelling units and the generation of shelter populations. However they do seem to suggest an association between certain housing types and the probability of going to a shelter in the event of a major earthquake.
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ABAG, the Association of Bay Area Governments, is the regional planning and services agency for the nine-county San Francisco Bay Area.This page was last updated 10/20/03 by jbp.
