United States Earthquakes, 1931

By Frank Neumann, 1932, U.S. Department of Commerce, Coast and Geodetic Survey, Serial Number 553, U.S. Government Printing Office, pp. 20-21.
      WASHINGTON AND OREGON
 [120th meridian or Pacific standard time]

January 20: 23.10, Sultan, Wash. Slight.
April 17: 4.00, Twisp, Wash. Feeble.
April 7, 17: 20.00, near, Bellingham, Wash. (48 degrees 45' N., 122 degrees 15' W.).
	Force (See map.) Felt over an area of approximately 5,000 square miles.
 1931 Isoseismal Map
	At Acme a few bricks fell from chimneys, at Lawrence wall paper cracked
	(aided by hot, dry weather), and at Saxon a severe twisting motion was
	reported. Force V Acme, Van Zandt, Saxon, Lawrence, Bellingham,
	Clipper, Oso, and Tyman r, Force IV at Burlington, Concrete, 7 miles east
	of Deming, Hamilton, Mount Vernon, Maple Falls, McMurray, Sedro Wooley,
	Sumas, Wickersham, and Victoria, British Columbia. Also felt 17 miles
	east of Arlington, at Alger, Bow, Bryant, Blanchard, Beach, Birdsview,
	Bayview, Clearlake, Custer, Darrington, Everett, Edgecomb, Florence,
	Fortson, Ferndale, Glacier, Lake Whatcom, Lynden, Marietta, Marblemount,
	Robe, Snoqualmie, Snohomish, Saulk, Silverton, Nooksack, and Welcome, all
	in Washington.
May 28: 23.10, Sultan, Wash. Feeble.
June 11: 23.30. Same.
July 30: 7.33, Nanaimo, British Columbia. Sharp local shock.
August 16: 19.20. Force V at Talent, Oreg., where press reported lamp shaken
   	from ceiling and one man thrown from chair. Also felt at Phoenix, Talbot,
   	and Ashland.
August 19:  7.05.  Sultan, Wash.  Feeble.
August 23:  10.01.  Earthquake off Eureka, Calif.; felt at Klamath Falls, Beagle, Curtin, and Hugo, Oreg.
September 3: 19.22, Central Point, Oreg.  Feeble.
September 18:  12.20, Chelan Falls and Lakeside, Wash.  Moderate.  Also felt at Manson, Winesap, and Chelan.
October 1:  3.10 to 3.50 (ship's time), at sea.  Steamer Admiral Farragut felt heavy tremors in lat. 42° 56' N., long. 124° 44' W.  Sulphurous odors observed and phosphorescent light trailed in wake of propellers.
December 8:  6.25, Lakeside, Chelan and Winesap, Wash.  Slight.
December 29:  0.27, Sultan, Wash.  Feeble.
December 31:  7.25,* near Seattle, Wash. (47° 30' N., 123° 00' W.)  Force VI.  (See map.)  Felt over an area of approximately 10,000 square miles.  Recorded at Seattle.  At Lilliwaup, force VI, a concrete wall in a store was cracked and a wash basin was knocked off a nail.  Force V at Belfair, Grapeview, Quilcene, Potlatch, and Snohomish, where articles were shaken from store shelves. Force IV at Bremerton, Fox Island, Happy Hollow, Kingston, La Grande, Nisqually, Olympia, Port Madison, Port Ludlow, Shelton, Tahuya, and Union.  Also felt at Allyn, Bothell, Centralia, Chambers Prairie, Darrington, Dockton, Goldbar, Glenwood, Hoodsport, Lake Bay, Littlerock, Longview, Mukilteo, Olalla, Portage, Port Richard, Paulsbo, Rollingbay, Silverton, Sultan, Stanwood, Swans Trail, Seattle, and Tacoma.


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