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Figure 3.15. Ground Shaking Horizontal Acceleration
Source : U.S. Geological Survey, map generated by National Atlas of the United States, www.nationalatlas.gov/
This hazard’s probability on a Regional level is ‘Unlikely’ to occur in the next three years.
However, because of the dams and levees within Region L, it is imperative that the counties that
make up this region are cognizant of the earthquake risks posed by the faults that reside to the
east and west of them, and mitigate in order to prevent dam and levee failure.
Impact and Vulnerability
The impact of an earthquake in Region L would be minimal. Damages would result from earth
shaking that is a result of an earthquake not in the Region. Displaced households for the total
Region would be 407 in the case of a worst case event. Building loss would be $727,978 for the
same worst case event. While Region L does rank in the top 10 counties for damages due to
an earthquake during a worst case event, this scenario is based on a 2,500 year span.
While Region L is not in a high shake zone, and the counties that make up the region are not
alongside of a fault, losses could still potentially be great in terms of damages due to the
development and population base being higher. So, although earthquake shaking would be
less severe in some populated areas, the damages may be greater due to more buildings and
populations in those areas. Particularly if the building structures are more than one story.
Table 3.44 provides estimated building losses and displaced households for Region L, as a
result of a 2,500 year probabilistic 6.7 Magnitude earthquake followed by Table 3.45 that shows
Region L as being in the top 10 counties in terms of building damage. Table 3.46 shows the
top 10 counties in terms of displaced households. These tables reflect damages from a worst
case scenario event.
3.75