Table 1.

List of case sites used in our study.

	site	year of onset	M MAX	M MIN	no. of events	references
1	Azle-Reno	2013	3.6	0.8	634	Hennings et al. [31]
2	Dallas Fort Worth	2008	3.2	1.5	64	Hennings et al. [31]
3	Venus	2009	4.0	0.0	917	Hennings et al. [31]
4	Irving	2014	3.9	2.2	818	Hennings et al. [31]
5	Timpson	2008	4.8	2.1	49	Frohlich et al. [32]
6	Reeves	2018	4.9	1.3	208	Skoumal et al. [33]
7	Cogdell	2006	4.3	2.5	285	Gan and Frohlich [34]
8	Cushing	2013	5.0	2.5	501	McGarr and Barbour [35]
9	Fairview	2014	5.1	2.3	2711	Goebel et al. [36]
10	Guthrie	2011	4.2	2.5	1993	Schoenball et al. [37]
11	Pawnee	2013	5.8	2.2	1525	Walter et al. [38]
12	Prague	2009	5.7	2.2	1014	Keranen et al. [1]
13	Harper	2014	4.3	2.0	466	Verdecchia et al. [39]
14	Milan	2014	4.9	1.6	277	Verdecchia et al. [39]
15	Guy-Greenbrier	2009	4.7	2.1	1312	Horton [40]
16	Greeley	2014	3.3	0.5	1241	Yeck et al. [41]
17	Paradox	1991	4.4	1.5	6120	Block et al. [42]
18	Raton	1995	5.3	2.6	642	Nakai et al. [43]
19	Youngstown	2011	4.1	1.3	282	Kim et al. [44]
20	Cordel	1992	4.0	2.2	124	Schultz et al. [45]
21	Eagle West	1984	4.3	2.5	91	Horner et al. [46]
22	Graham	2003	4.0	2.3	246	Hosseini and Eaton [47]
23	Musreau	2018	3.9	1.7	44	Li et al. [48]

See electronic supplementary materials and Watkins et al. [25] for further details for each site.