Quantifying the spatiotemporal dynamics of the first two epidemic waves of SARS-CoV-2 infections in the United States
Fig 3
Daily mean areal expansion rate and wavefront speed for SARS-CoV-2 infection waves for 63 days preceding the infection per capita peak.
(Wave 1: September 8, 2020–November 11, 2020; Wave 2: July 7, 2021–September 4, 2021). Top Panel: Mean daily areal expansion rate. Bottom Panel: Mean daily wavefront speed. Note: Areal expansion rate is the daily change in wave area. Wavefront speed is the distance from a vertex of the hexagonal grid at day d to the nearest point on the line at day d + 1.