Community variations in social vulnerability to Cascadia-related tsunamis in the U.S. Pacific Northwest |
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Authors: | Nathan J Wood Christopher G Burton Susan L Cutter |
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Institution: | (1) Western Geographic Science Center, U.S. Geological Survey, 1300 SE Cardinal Court, Bldg. 10, Vancouver, WA 98683, USA;(2) Hazards and Vulnerability Research Institute, Department of Geography, University of South Carolina, Columbia, SC 29208, USA |
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Abstract: | Tsunamis generated by Cascadia subduction zone earthquakes pose significant threats to coastal communities in the U.S. Pacific
Northwest. Impacts of future tsunamis to individuals and communities will likely vary due to pre-event socioeconomic and demographic
differences. In order to assess social vulnerability to Cascadia tsunamis, we adjust a social vulnerability index based on
principal component analysis first developed by Cutter et al. (2003) to operate at the census-block level of geography and focus on community-level comparisons along the Oregon coast. The number
of residents from blocks in tsunami-prone areas considered to have higher social vulnerability varies considerably among 26
Oregon cities and most are concentrated in four cities and two unincorporated areas. Variations in the number of residents
from census blocks considered to have higher social vulnerability in each city do not strongly correlate with the number of
residents or city assets in tsunami-prone areas. Methods presented here will help emergency managers to identify community
sub-groups that are more susceptible to loss and to develop risk-reduction strategies that are tailored to local conditions. |
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