Electronic Supplement to
The Array Network Facility Seismic Bulletin: Products and an Unbiased View of United States Seismicity

by Luciana Astiz, Jennifer A. Eakins, Vladislav G. Martynov, Trilby A. Cox, Jonathan Tytell, Juan C. Reyes, Robert L. Newman, Gulsum H. Karasu, Taimi Mulder, Malcolm White, Geoffrey A. Davis, Robert W. Busby, Katrin Hafner, Jon C. Meyer, and Frank L. Vernon

Table S3. Statistical Summary of ANF origin time standard deviation error (sdobs)

Time Zone	Time period	No of Events	Mean sdobs (s)	Median sdobs (s)
Pacific	Apr. 15, 2004 Aug. 15, 2007	18,291	0.64	0.59
	Aug. 16, 2007 Mar. 31, 2012	5,616	0.49	0.43
	Apr. 1, 2012 Nov. 30, 2013	2,824	0.55	0.49
Mountain	Apr. 15, 2004 Aug. 15, 2007	3,138	0.49	0.47
	Aug. 16, 2007 Mar. 31, 2012	16,465	0.45	0.43
	Apr. 1, 2012 Nov. 30, 2013	159	0.85	0.83
Central	Apr. 15, 2004 Aug. 15, 2007	1	0.76	-
	Aug. 16, 2007 Mar. 31, 2012	5,167	0.39	0.37
	Apr. 1, 2012 Nov. 30, 2013	1,888	0.5	0.47
Eastern	Apr. 15, 2004 Aug. 15, 2007	1	0.76	-
	Aug. 16, 2007 Mar. 31, 2012	71	0.48	0.4
	Apr. 1, 2012 Nov. 30, 2013	3,247	0.53	0.5
Composite	Apr. 15, 2004 Aug. 15, 2007	21,431	0.62	0.57
	Aug. 16, 2007 Mar. 31, 2012	27,319	0.45	0.42
	Apr. 1, 2012 Nov. 30, 2013	8,218	0.54	0.49
	Apr. 15, 2004 Nov. 30, 2013	56,968	0.53	0.48

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