Electronic Supplement to
Semiannual Earthquake Periodicity

by Patrick H. McClellan

Table S7. Solar Semiannual (Ssa) Phase of M ≥ 6.6 Earthquakes in the Salton Trough and Gulf of California from 1 January 1900 to 1 April 2014

Date Time, UTC (hh:mm:ss.ss) Latitude (°) Longitude (°) Magnitude* Phase
16 October 1907 14:57:18.0 28 −112.5 7.2 0.124
4 April 2010 22:40:43.1 32.3 −115.28 7.2 0.082
9 December 1901 02:17:00.0 26 −110 7.1 0.422
12 December 1902 23:10:00.0 29 −114 7.1 0.442
21 November 1915 00:13:42.0 32 −115 7.1 0.320
31 December 1934 18:45:56.0 32.69 −115.76 7.1 0.548
19 May 1940 04:36:48.0 33.22 −115.7 7.1 0.319
29 April 1954 11:34:38.0 29.03 −112.97 7.1 0.211
9 April 1968 02:29:01.0 33.16 −116.19 7 0.105
17 August 1969 20:14:59.0 24.84 −109.69 7 0.805
12 April 2012 07:15:48.5 28.7 −113.1 7 0.124
5 March 1901 10:45:0 25 −110 6.9 0.912
3 August 2009 17:59:56.17 29.039 −112.903 6.9 0.731
27 June 1945 13:8:20.0 27 −111 6.8 0.529
18 June 1988 22:49:42.37 26.856 −110.996 6.7 0.486
21 October 2010 17:53:13.57 24.696 −109.156 6.7 0.158
23 May 1918 11:57:42 27.753 −110.933 6.6 0.338
12 June 1922 4:47:34 23.198 −108.908 6.6 0.444
12 July 1932 19:24:12.0 26.238 −110.288 6.6 0.611
7 July 1932 16:15:53.0 29.098 −113.318 6.6 0.584
20 November 1949 7:9:43.0 28.1 −112.6 6.6 0.320
5 April 1955 15:9:19.0 25.2 −109.6 6.6 0.082
9 February 1956 14:32:42.0 31.705 −116.059 6.6 0.779
1 November 1969 11:8:21.0 23.084 −107.994 6.6 0.217
30 September 1971 8:18:0.0 26.97 −110.837 6.6 0.037
28 August 1995 10:46:12.06 26.092 −110.284 6.6 0.860
4 January 2006 8:32:32.4.0 28.164 −112.117 6.6 0.583
19 October 2013 17:54:54.7 26.0913 −110.3209 6.6 0.149
8 July 1975 9:37:27.3 29.459 −113.346 6.5 0.586
24 November 1987 13:15:56.4 33.01 −115.84 6.5 0.343
3 October 2002 16:8:29.62 23.324 −108.53 6.5 0.058
15 October 1979 23:16:54.5 32.633 −115.333 6.4 0.124
9 June 1980 3:28:18.9 32.22 −114.985 6.4 0.433
12 March 2003 23:41:32.92 26.556 −110.587 6.4 0.955
31 May 1974 14:4:59.9 27.226 −111.238 6.3 0.384
25 September 2012 23:45:24.94 24.666 −110.173 6.3 0.019
22 June 1991 0:30:26.48 23.915 −108.549 6.2 0.498
30 June 1995 11:58:56.88 24.688 −110.228 6.2 0.544

* Magnitude type as given in ANSS catalog.

† Phase is the fraction of the cycle elapsed between bounding equinoxes.

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