Electronic Supplement to
Semiannual Earthquake Periodicity

by Patrick H. McClellan

Table S22. M ≥ 7.8 Aftershocks and Foreshocks North of 23.5° N (Tropic of Cancer) from 1 January 1900 to 13 February 2015

Date Time, UTC (hh:mm:ss.ss) Latitude (°) Longitude (°) Magnitude*
23 July 1905 2:46:22 49.369 96.61 8.3
15 November 2006 11:14:16 46.517 153.319 8.3
1 September 1923 2:58:35 35.413 139.298 8.1
13 January 2007 23:21.2 46.243 154.524 8.1
25 December 1932 2:04:30 39.496 96.616 7.9
16 May 1968 10:39:02 41.43 142.864 7.9
12 May 2008 28:01.6 31.002 103.322 7.9
11 March 2011 6:15:38 36.22 141.084 7.9
11 March 2011 15:40.3 36.281 141.111 7.9
2 September 1923 2:46:41 35.007 139.926 7.8
20 October 1963 0:53:12 44.726 150.547 7.8
6 March 1988 35:38.1 56.953 −143.032 7.8
28 December 1994 19:23.0 40.525 143.419 7.8

See Case S9 “Note: Modified U.S. Geological Survey Database” subsection for explanation of events
included in the April 2014 catalog search in Table S17 that are not included in the February 2015 search above.

* Magnitude type as given in ANSS catalog.

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