From the Summary: "Disaster Unemployment Assistance (DUA) benefits are available only to those individuals who have become unemployed as a direct result of a declared major disaster and are not eligible for regular Unemployment Compensation (UC). First created in 1970 through P.L. 91-606, DUA benefits are authorized by the Robert T. Stafford Disaster Relief and Emergency Relief Act (the Stafford Act), which authorizes the President to issue a major disaster declaration after state and local government resources have been overwhelmed by a natural catastrophe or, 'regardless of cause, any fire, flood, or explosion in any part of the United States' (42 U.S.C. §5122(2))."
CRS Report for Congress, RS22022
Congressional Research Service: https://crsreports.congress.gov/