9/56 YEAR CYCLE: WASHINGTON EARTHQUAKES: 1890-2005

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Appendix for the paper 9/56 year Cycles: Earthquakes & Volcanoes.

The Pacific Northwest Seismograph Network  listed some 22 Washington earthquakes (mag =>5.5) that occurred since 1870. Of this figure, 11 took place in the 12 months ending December 12 of those years in the 9/56 year patterns presented in Table A. Only 3.9 could have been expected by chance.


DATE-(UTC)-TIME   LAT(N) LON(W)   DEP  MAG QUAL COMMENTS
yy/mm/dd hh:mm:ss   deg.   deg.    km   Ml
1872/12/15 05:40:00  47.75N 119.87W   0.0 6.8   14.5 km  SE of Chelan, WA
1880/12/12 20:40:00  47.50N 122.50W   0.0 6.0   12.3 km  SE of Bremerton, WA
1882/04/30 10:40:00 47.40N 122.59W 0.0 5.7 18.7 km S of Bremerton, WA
1891/11/29 23:21:00  48.00N 123.50W   0.0 5.6   13.5 km SSW of Port Angeles, WA
1909/01/11 23:49:00  48.70N 122.80W  31.0 6.0   23.8 km  NE of Friday Harbor, WA
1915/08/18 14:05:00 48.50N 121.40W 0.0 5.6 22.5 km SSW of Newhalem, WA
1918/12/06 12:45:00  49.00N 125.91W   0.0 7.0   16.1 km   S of Tofino, BC
1919/10/10 01:07:20  48.63N 127.15W   0.0 5.5  107.4 km WSW of Tofino, BC
1920/01/24 07:09:00 48.59N 123.00W 0.0 5.5 7.2 km N of Friday Harbor, WA
1928/02/09 11:05:00  49.00N 125.30W   0.0 5.8   48.1 km ESE of Tofino, BC
1932/07/18 06:01:00  48.00N 121.80W   0.0 5.7   15.6 km  SE of Granite Falls, WA
1936/07/16 07:07:49  46.00N 118.30W   0.0 6.1    8.1 km SSE of Walla Walla, Wa
1939/11/13 07:45:54  47.40N 122.59W  31.0 6.2   18.7 km   S of Bremerton, WA
1942/11/01 18:50:06  48.00N 116.69W   0.0 5.5   64.6 km  NE of Spokane, WA
1945/04/29 20:16:17  47.40N 121.69W   0.0 5.7   12.5 km SSE of North Bend, WA
1946/02/15 03:17:47  47.29N 122.90W  25.0 5.8   28.4 km   N of Olympia, WA
1946/06/23 15:13:00  49.80N 125.30W   0.0 7.4   26.3 km WNW of Courtenay, BC
1949/04/13 19:55:43 47.09N 122.75W 54.0 7.1 12.3 km ENE of Olympia, WA
1965/04/29 15:28:43  47.40N 122.40W  57.0 6.5   18.3 km   N of Tacoma, WA
1980/05/18 15:32:11  46.20N 122.18W   2.8 5.7  BA  FELT    1.0 km NNE of Mt St Helens, WA
1999/07/03 01:43:54  47.07N 123.46W  40.7 5.8  BA  FELT    8.0 km   N of Satsop, WA
2001/02/28 18:54:32  47.14N 122.72W  51.9 6.8  BA  FELT   17.0 km  NE of Olympia, WA