WASHINGTON AND OREGON
(120th MERIDIAN OR PACIFIC STANDARD TIME)
January 26: 13:40:43.2*. Epicenter 46 degrees 06'
north, 122 degrees 24' west, Merrill Lake, Wash., S.
Felt over an area of approximately 2,000
square miles of southwestern Washington.
Maximum intensity V.
INTENSITY V:
Woodland.-Felt by all. Windows and
dishes rattled. Motion slow, lasted 5 seconds;
faint earth noises from south-north.
INTENSITY IV: Ariel, Carrolls, Curtis, Heis-
son, Kalama, La Center, Mossyrock, Pe Ell,
Ryderwood (near), and Vader.
INTENSITY I-III: Castle Rock, Chehalis,
Kelso, Longview, Napavine, Rosburg, Silver-
lake, Toledo (1 mile northeast of), Toutle,
Winlock, and Yacolt.
March 20: 08:47. Swift Dam Powerhouse
(about 5 1/2 miles east of Cougar), Wash.
Light tremor.
April 16: 16:18. Mount Rainier National
Park (Nisqually Entrance), Wash. IV. Felt
by several. Windows rattled. Effect like dis-
tant explosion, duration 1 second; moderate
thumping earth noises.
July 14: 07:50:03.3*. Epicenter 48.9 degrees
north, 122.5 degrees west, northwestern Washington,
about 12 miles north of Bellingham, S. Felt
over an area of approximately 8,000 square
miles of northwestern Washington and British
Columbia, Canada. (See map, page 31.)
Maximum intensity VI. Damage slight.
Plaster cracked slightly at several places in
Washington and at two places in British,
Columbia. Magnitude 5.0.
INTENSITY VI IN WASHINGTON:
Bellingham.-Felt by many and frightened
few in community. Damage slight. Plaster
cracked. Pictures fell; small objects shifted.
Motion rapid, duration few seconds to 1 min-
ute. Loud earth noises from east.
Custer.-Felt by, awakened, and frightened
all in community. Plaster cracked. Small ob-
jects and furnishings shifted; vases, etc., small
objects overturned; knickknacks fell. Rapid,
5-6 second shock in east-west direction; pre-
ceded 1-2 seconds by moderate earth noises.
Lummi Island.-Felt by all and frightened
few in community. Damage slight. Fireplace
chimney split, mortar fell. Small objects
shifted. Motion rapid, jolting, like sonic boom;
lasted about 7 seconds, direction southeast;
moderate roar from southeast at instant shock
was felt.
Lynden.-Felt by all except persons riding
in cars or walking outdoors; frightened many.
Damage slight. Plaster cracked. Small ob-
jects and furnishings shifted; knickknacks fell.
Light fixtures hanging on 5-foot chains swung
northwest-southeast in about a half-inch arc.
Motion rapid, lasted 40 seconds; direction
northwest-southeast. Loud earth noises pre-
ceded shock by 10 seconds.
Nooksack.-Felt by observer. Damage
slight. Wall cracked. Motion rapid, lasted
1 1/2 seconds.
Sumas.-Felt by all, awakened few, and
frightened many in community. Damage
slight. Plaster cracked. Small objects
shifted; knickknacks fell. Motion rapid, lasted
20 seconds, direction northeast; loud earth
noises from southwest preceded shock by 5
seconds.
INTENSITY VI IN BRITISH COLUMBIA, CANADA:
Abbotsford.-Felt by all, awakened and
frightened few in community. Damage slight.
Plaster cracked slightly; small amounts of
plaster fell. Small objects shifted; rattling
and movement of small objects caused some
persons to run to the streets. Motion rapid,
lasted 4 seconds, direction southwest-northeast;
preceded 1-2 seconds by loud earth noises.
White Rock.-Felt by all in community.
Damage slight. Ceiling cracked. Trees,
bushes shaken moderately. Motion rapid,
lasted 30 seconds; thunderous earth noises
seemed from all directions. "Strongest shock
since 1946."
INTENSITY V IN WASHINGTON: Blaine,
Blanchard, Clipper, Eastsound, Ferndale,
Hamilton, Lopez, Lyman, Marietta, Sinclair
Island, and Waldron.
INTENSITY V IN BRITISH COLUMBIA, CANADA:
Cloverdale and North Vancouver.
INTENSITY IV IN WASHINGTON: Acme, Bow,
Clearlake, Concrete, Deer Harbor, Deming,
Edison, Everson, Glacier, Maple Falls, Olga,
Orcas, Rockport, Shaw Island, Sultan, and
Van Zandt.
INTENSITY IV IN BRITISH COLUMBIA, CANADA:
Chilliwack, Ladner, Langley, Mission City,
Sidney, and Vancouver.
INTENSITY I-III IN WASHINGTON: Anacortes,
Arlington, Decatur, Friday Harbor, Marble-
mount, Point Roberts, Silvana, Stanwood, and
Wickersham.
INTENSITY I-III IN BRITISH COLUMBIA, CAN-
ADA: Cassidy, Duncan, Lake Cowichan area,
New Westminster, Port Coquitlam, and West-
holme.
July 30: 04:45:15.4*. Epicenter 49.2 degrees
north, 122.3 degrees west, British Columbia-Washing-
ton border region, S. Felt over an area of
approximately 3,000 square miles in the United
States, principally in Whatcom and San Juan
counties. Maximum intensity V.
INTENSITY V:
Blanchard.-Felt by and awakened many.
Windows, doors, and dishes rattled; house
creaked. Motion rapid, lasted 1 minute.
Bow.-Awakened all in home. Definite east-
west motion, duration 2 minutes.
Edison.-Felt by several; awakened and
frightened few in community. Small objects
shifted. Rapid, 10-second shock.
Lopez.-Felt by several in home. Pendulum
clock stopped. Windows rattled. Motion
slow, lasted 2 seconds, direction northeast;
faint earth noises from northeast preceded
shock by few seconds.
Lynden.-Felt by and awakened many in
community. Sudden, rapid jolt, lasted 5 sec-
onds; faint earth noises.
Nooksack.-Felt by all in community.
House creaked. Duration few seconds; pre-
ceded few seconds by moderate earth noises.
INTENSITY IV: Anacortes, Bellingham, Cus-
ter, Decatur, Eastsound, Everson, Ferndale,
Friday Harbor, Marietta, Point Roberts, Su-
mas, and Waldron.
INTENSITY I-III: Deer Harbor, Hamilton,
La Conner, Marblemount, and Olga.
July 30: 07:33:14.7*. Epicenter 47.7 degrees
north, 122.1 degrees west, about 13 miles northeast of
Seattle, S. V. Felt in scattered communities
over an area of approximately 1,500 square
miles of northwestern Washington.
INTENSITY V:
Edison.-Felt by several; awakened and
frightened few in community. Small objects
shifted. Slow, 10-second shock.
La Conner.-Felt by all in home. Floor
lamps swayed to-and-fro; hanging objects
swung. Slow, 1-minute shock.
INTENSITY IV: Baring, Clinton, Granite
Falls, Index, Indianola, Issaquah, Lake
Stevens, Langley, Port Ludlow, Preston, Rich-
mond Beach, Seattle, and Stanwood.
INTENSITY I-III: Blanchard, Bow, Carna-
tion, Dockton, Duvall, Fall City, Gorst, Grotto,
Kenmore, Kingston, Marblemount, Medina,
Mercer Island, Midway, North Bend, Olalla,
Port Townsend, Sultan, and Woodinville.
October 1: 04:31:24.6*. Epicenter 45.7 degrees
north, 122.8 degrees west, Washington-Oregon border
region, W. V. At Portland, hundreds of per-
sons were awakened and telephoned newspaper
office and police department. Windows, doors,
and dishes rattled. At Swift Dam, Wash.,
about 5 1/2 miles east of Cougar, and about 55
miles northeast of Portland, awakened all in
home. Windows and doors rattled; house
creaked. Slow, 5-second shock in northeast-
southwest direction. Magnitude 5.3.
October 15: 06:32:38*. Epicenter 47.7 degrees
north, 122.1 degrees west, east of Seattle, Wash., in
the Sammamish Lake area, W. Felt over an
area of approximately 900 square miles of
northwest Washington, principally in King
and Snohomish counties. Maximum intensity
V. Magnitude 4.1.
INTENSITY V:
Bellevue.-Felt by all; awakened many and
frightened few in community. Windows,
doors, and dishes rattled; house creaked.
Trees, bushes shaken moderately. Motion
slow, lasted 30 seconds.
Kirkland.-Felt by and frightened all in
home. Windows, doors, and dishes rattled.
Motion rapid, lasted 1-2 minutes; moderate
earth noises.
Medina.-Felt by and awakened all in home.
Motion slow, very brief, preceded 10 seconds
by loud, rumbling earth noises from north.
Preston.-Felt by and awakened many in
community. Motion rapid, lasted 1-2 seconds;
preceded 1-2 seconds by faint earth noises.
INTENSITY IV: Duvall, Mercer Island, Sno-
qualmie Falls, and Woodinville.
INTENSITY I-III: Bothell, Index, Issaquah,
Mukilteo (4 miles south of), Pacific, Portage,
Port Gamble, Rollingbay, Seattle, and Sultan.
UW Dept. of Earth and Space Sciences ..... . PNW EARTHQUAKES