The Social Vulnerability Index (SVI)
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Filetype[PDF-427.75 KB]


  • English
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    Details:

    • Corporate Authors:
      United States. Agency for Toxic Substances and Disease Registry. Geospatial Research, Analysis & Services Program.
    • Description:
      Every community must prepare for and respond to hazardous events, whether a natural disaster like a tornado or disease outbreak, or a human‐made event like a harmful chemical spill. A number of factors, including poverty, lack of access to transportation, and crowded housing may weaken a community’s ability to prevent human suffering and financial loss in the event of disaster. These factors are known as social vulnerability.

      ATSDR’s Geospatial Research, Analysis & Services Program (GRASP) has created a tool to help emergency response planners and public health officials identify and map the communities that will most likely need support before, during, and after a hazardous event.

      The Social Vulnerability Index (SVI) uses U.S. Census data to determine the social vulnerability of every Census tract. Census tracts are subdivisions of counties for which the Census collects statistical data. The SVI ranks each tract on 14 social factors, including poverty, lack of vehicle access, and crowded housing, and groups them into four related themes. Maps of the four themes are shown in the figure below. Each tract receives a separate ranking for each of the four themes, as well as an overall ranking.

      The SVI can help public health officials and local planners better prepare for and respond to emergency events like hurricanes, disease outbreaks, or exposure to dangerous chemicals.

      The SVI can be used to:

       Estimate the amount of needed supplies like food, water, medicine, and bedding.

       Help decide how many emergency personnel are required to assist people.

       Identify areas in need of emergency shelters.

       Plan the best way to evacuate people, accounting for those who have special needs, such as people without vehicles, the elderly, or people who do not understand English well.

       Identify communities that will need continued support to recover following an emergency or natural disaster.

    • Subjects:
    • Document Type:
      Pamphlet (or booklet)
    • Genre:
      Fact Sheet
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