United States Earthquakes, 1956

By Rutlage J. Brazee and William K. Cloud, 1958, U.S. Department of Commerce, Coast and Geodetic Survey, U.S. Government Printing Office, pp. 34-35.
WASHINGTON AND OREGON
(120th MERIDIAN OR PACIFIC STANDARD TIME)

January 6: 20:29:35*. Epicenter 47 degrees 19' north, 122 degrees 25' west, S. Felt area approximately
	2,500 square miles of Puget Sound, Washington. Maximum intensity V.
     INTENSITY V:
       Burley.-Felt by all. Windows rattled. Faint earth noises heard.
       Dash Point.-Felt by observer outdoors. Small objects shifted. Dishes rattled. Hanging
	objects swung. Motion rapid.
       Dieringer.-Felt by several. Small objects shifted. Windows rattled.
       Retsil.-Felt by all. Moderate earth noises heard. Motion rapid.
     INTENSITY IV: Cove, Dockton, Fox Island, Gorst, Lakebay, Olympia (4 miles south of), Port
	Orchard, Seattle, Vashon, and Wauna.
     INTENSITY I TO III: Black Diamond, Bremerton, Kent, Olalla, Orillia, Pacific, Portage, Steila-
	coom, and Tacoma.
February 8: 16:57:12* and 17:29. Epicenter 48 degrees 21' north, 122 degrees 39' west, northwest corner of
	Whidbey Island, few miles south of Deception Pass, S. Felt area approximately 4,000 square miles
	of northwestern Washington. Maximum intensity V. It was reported some objects fell from store
	shelves (no location given). Aftershock at 17:29 reported as considerably weaker.
     INTENSITY V:
       Anacortes.-Felt by all. Doors rattled and swung north. Trees, bushes shaken slightly.
	Motion rapid.
       Bay View.-Felt by all and frightened few. Trees, bushes shaken moderately. Hanging
	objects swung. Windows and doors rattled. Loud earth noises from east heard. Motion rapid.
	Two moderate shocks, close together, felt about 25 minutes after first shock.
       Burlington.-Felt by many and frightened few in community. Small objects shifted. Trees,
	bushes shaken slightly. Windows, doors, and dishes rattled for about 30 seconds. Loud earth
	noises heard by many at time of shock. Motion rapid.
       La Connor.-Felt by all and frightened few in community. Windows, doors, and dishes rattled;
	house creaked. Loud earth noises heard by many at time of shock. Motion rapid.
       Mount Vernon.-Felt by all. Small objects and furnishings shifted. Hanging objects swung.
	Loud earth noises heard by many. Motion rapid.
       Oak Harbor.-Felt by all. Windows, doors, and dishes rattled. Motion rapid, jarring, felt
	like truck hit building.
     INTENSITY IV: Arlington, Coupeville, Doebay vicinity, East Stanwood, Fortson, Friday Harbor,
	Granite Falls, Lopez, Marysville, Orcas, Sedro Woolley, and Stanwood.
     INTENSITY I TO III: Acme, Bellingham, Bothell, Gold Bar, Index, Oso, Port Townsend, Shaw
	Island, Silvana, and Startup.
February 14: 05:55. Aftershock of February 8. Felt at Coupeville and Port Townsend.
February 24: 14:00 (about). Washington. Electric City (about 2 miles southwest of Grand
	Coulee). V. Felt by many (some outdoors); awakened few in community. Small objects shifted.
	Pictures swung. Moderate earth noises heard by few at time of shock. Motion rapid. Described
	by some as similar to concussion and movement caused by blasting but of different sound. At
	Grand Coulee quite a vibration was noticed which observer thought was a sonic boom, due to jet
	activity at the time.
April 8: 14:28:12*. Northwestern Washington. Epicenter 48 degrees 26' north, 123 degrees 08' west, S.
	Felt area approximately 1,200 square miles in the United States. IV. Felt by several at Anacortes
	where windows, doors, and dishes rattled; hanging objects swung northeast; trees, bushes shaken
	slightly. Frightened few at Decatur Island; windows, doors, and dishes rattled; house creaked.
	At Eastbound, felt by many and frightened few; windows rattled slightly; house creaked. Felt
	by many at Oak Harbor. House creaked at Olga. Felt at Orcas. Windows and oil burner stove
	rattled; house creaked. Felt at Sequim. Windows rattled; chains shook. Loud blastlike noises
	from north. At Shaw Island, felt by several. Chimney creaked. Second shock felt about 15
	seconds later. Also felt at Coupeville, Friday Harbor, Hadlock, and Lopez.
April 26: 08:48:22*. Puget Sound area, Washington. Epicenter about 10 miles south of the
	University of Washington, Seattle, S. III. Sudden jolt then slow rolling motion, lasting 5-10
	seconds felt by observer in home at Renton. At Seattle, felt by observer and at least one other person.
	Floor (on wooden beams) vibrated vertically. Motion similar to heavy truck passing but of longer
	duration. Also felt at Issaquah.
December 15: 01:50. Washington. IV. Minor explosivelike disturbance. Felt by many
	and frightened few at Kelso and Longview. In southwestern Longview insecure shelf tilted, caus-
	ing several dishes to fall. Windows and dishes rattled. Motion brief, rolling, seemed from all
	directions. Also felt at Lexington, 2 miles north of Longview.


Back to:... US Earthquakes 1928-1970..... About Isoseismals and US Earthquakes

UW Dept. of Earth and Space Sciences ..... . PNW EARTHQUAKES

University of Washington Dept. of Earth and Space Sciences, Box 351310 Seattle, WA, 98195-1310
Modified 12/24/98 - If you see any problems e-mail: seis_web@ess.washington.edu