Electronic Supplement to
Semiannual Earthquake Periodicity

by Patrick H. McClellan

Table S14. Aftershocks in the New Madrid Seismic Zone Excluded from Table S13, Including M ≥ 4.3 Aftershocks (n = 4) from 1 January 1900 to 1 April 2014 in the ANSS Catalog Data Set and Notable Aftershocks (n = 3) back to 1800 in Dart and Volpi (2010)

Date	Time, UTC (hh:mm:ss.sss)*	Latitude (°)	Longitude (°)	Magnitude†
7 February 1812	09:45:99	—	—	7.7
23 January 1812	15:15:99	—	—	7.5
18 April 2008	09:37:00.000	38.45	−87.89	5.4
25 March 1976	00:41:20.500	35.59	−90.48	4.9
18 April 2008	15:14:16.400	38.476	−87.847	4.8
3 April 1974	23:05:02.500	38.592	−88.094	4.5
6 January 1843	02:30:99	—	—	—

* 99 denotes the time unit value is unavailable.

† Magnitude type as given in the ANSS catalog or by Dart and Volpi (2010).

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