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. 2022 Jan 13;12:699. doi: 10.1038/s41598-021-04653-2

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Decay of the correlation function with distance. (a) The correlation function as a function of the distance, averaged over all counties in the United States. Different curves correspond to different instances of time, for the first two weeks of the month from March 2020 to February 2020. (b) Same plot as in (a) in double logarithmic axes for select months. (c) For clarity, we split the plot in (a) into three different time intervals and focus on four months within these intervals. (d) Comparison of the correlation functions, averaged over all counties within the four US regions, for May 2020, August 2020, and January 2021.