Fig. 3: Hazard frequency (natural log) at the county level across all data years (2017–2021).

For each county, we calculated the total number of hazards per year and then added 1 to derive the natural log of this value. The resulting values were mapped on the same scale for all states to ease comparison. For reference, the values 2, 4, and 6 in the legend are approximately 6, 54, and 402 events, respectively.