¸WASHINGTON AND OREGON (120th MERIDIAN OR PACIFIC STANDARD TIME) January 20: 23:15 (about). Milton-Free- water, Oreg. V. Slow, 8-10 second shock awakened many in community; frightened few; pictures swayed. Milton-Freewater area is about 12 miles south of Walla Walla, Wash. In the Walla Walla area, a number of persons at College Place and the State Line district felt tremors; house rattled and shook at State Line; awakened one. July 11: 00:02*. Felt at Coulee City and Deep Lake, Wash. At Deep Lake (about 5 miles southwest of Coulee City); house shaken; rolling, rumbling motion, July 11: 10:10. Deep Lake, Wash. IV. Felt by caretaker and by person on lake in boat; felt pressure on bottom of boat. Lake water visibly disturbed. July 11: 15:00. Deep Lake, Wash. Boom- ing sound heard. July 14: 11:00. Deep Lake, Wash. Rumble in Sun Lake State Park heard at Deep Lake. Water level in Deep Lake raised 6 inches in 7 days (lake 135 feet deep). Bureau of Reclama- tion aquifers Nos. 5 and 6 in nearby areas showed drop of 1-2 feet in water level. August 4: 15:53:30*. Epicenter 45 degrees 41' north, north, 122 degrees 16' west, about 13 miles northeast of Portland, Oreg., in Washington, S. Felt over a limited area of Washington and Oregon, approxi- mately 600 square miles. Maximum intensity (damage) V. At Fairview, Oreg., felt by several in community. (some outdoors). Small objects shifted; pendulum clock facing south stopped. Hard jolting motion. At Portland, felt by many, Sharp, explosivelike motion. Bookcases swayed; several reams of paper thrown northward to floor. Sharply felt in large downtown buildings; court- house swayed back and forth. Intensity (dam- age) IV in Oregon; Cascade Locks, Clackamas, Corbett, Gresham, and Troutdale; in Washington about IV to III at Camas and Washougal; also felt at Oregon City and Tigard, Oreg. August 5: 19:44:35* (main shock), 20:36:10*. Washington. Epicenter 47 degrees 49' north, 120 degrees 00' west, near Chelan and Chelan Falls, S. Felt over a large area of Washington, approximately 25,000 square miles. (See map, page 57.) Max- imum intensity (damage) VI. Minor damage at several localities; rock slides from steep hills near Chelan and Waterville.
INTENSITY (DAMAGE) VI: Brief (about 10 miles up-stream from Arden- voir). Furniture bounced off floor. Sounded like tons of dynamite exploding in vicinity of Mount Tyee foothills. Second shock very light. Chelan.-Felt by all and frightened many. Damage slight. Rocks fell from hills, 200 cubic yards at one place. Part of chimney fell; bricks fell; slight damage reported in office. Dishes broken. Two major shocks felt, plus two slight shocks after 20:45. Douglas.-Felt by all; frightened many. Dam- age slight. Small objects shifted and over- turned; knickknacks fell. "These two shocks were the most severe that we have felt since moving here in 1935." Entiat.-Felt by all and frightened few in community. Damage slight. Small objects shifted; knickknacks felt Hanson.--Felt by all; frightened many in community. Small objects shifted. Orondo.-Felt by all; frightened few. Chim- neys cracked. Damage slight. Canned goods fell from store shelves; knickknacks fell. Waterville.-Felt by all and frightened many in community. Rocks fell from steep canyon walls onto highway. Chimneys cracked; many bricks loosened and fell from church and 2-story houses: one large brick church suffered extensive inside plaster damage. "Probably the most severe shock felt in Waterville." First shock was followed by two smaller but quite definite shocks; third shock barely noticeable. INTENSITY (DAMAGE) V: Aeneas, Azwell (also felt shock at 20:36:10*), Baring, Cashmere (also felt shocks at 20:00 and 20:36:10*, heavy), Creston, Davenport, Electric City (also 20:36:10*), Grand Coulee (also felt shock at 20:36:10*), Grotto, Hartline, Hunters, Hyak, Keller, Leavenworth, Lester, Methow (also felt shock at 20:36:10*), Monitor, Moses Lake (three shocks), North Bend and 7, 15, and 18 miles east of, Palisades, Pateros, Peshastin, Preston, Randle, Skykomish, Steiliko Ranger Station (near Entiat), Warden, Wauconda, Wenatchee, Winthrop, and Withrow. INTENSITY (DAMAGE) IV: Almira (also felt shock at 20:36:10*), Beverly (also felt shock at 20:36:10*), Black Diamond, Brewster, Bridge- port, Carbonado, Carlton, Chesaw, Cle Elum, Colbert, Colfax, Conconully, Cougar, Coulee City, Coulee Dam (second shock also felt), Des Moines, Dryden (also felt shock at 20:36:10*), Elbe, Eureka, Fall City (two shocks felt), Farmer (both shocks felt), Harrington, Hatton (two shocks felt), Hooper, Inchelium, Limona, Laurier, Lowell, Loomis, Lucerne, Malaga, Malott, Mans- field, Marcus (also felt shock at 20:36:10*), Marengo, Marlin (shocks also felt at 20:36:10* and about 21:00), Mazama, Mold (second shock also felt), Monroe, Monse, Naches and 20 miles northwest of, Okanogan (second shock also felt), Olympia (also felt shock at 20:36:10*), Omak, Orillia, Othello, Packwood, Parkland, Port Orchard, Prescott; (also felt shock at 20:36:10*), Puyallup (also felt shock at 20:36:10*), Ralston (shock also felt in morning), Redmond, Redondo, Retsil, Ritzville, Ronald, Smyrna, Snohomish, Snoqualmie, Spokane, Stratford, Sultan, Tacoma (also felt shock at 20:36:10*), Thorp, Tonasket, Twisp, Wellpinit, Wilson Creek, and Winchester. INTENSITY (DAMAGE) I To III: Alder Dam, Amboy, Ashford, Auburn, Bellevue, Cedar Falls, Cusick, Darrington, Dayton, Dockton, Duvall, Easton, Ellensburg, Elmer City (three shocks felt during hour), Ephrata (5 miles north of), Govan, Index, Issaquah, Kettle Falls, Lacrosse, Lakebay, Lakewood, Malo, Marshall, Mayfield, Molson (6 miles west of), Nighthawk, Odessa (both shocks felt), Olalla, Orient, Orting, Portige, Port Gamble, Quincy, Ravensdale, Richmond Beach, Riverdale, Roslyn, Ruff, Seattle, Silverdale, Soap Lake, South Bend, South Prairie, Springdale, Spangle, Startup, Tieton, Tillicum, Touchet, Vail, and Wilbur. August 17: See "Western Mountain Region" for shocks felt in Washington and Oregon on August 17 (Hebgen Lake, Montana earthquake). August 18: 10:08. Chelan, Wash. Felt by some persons. October 14: 13:35:39*. Washington. Epi- center 47 degrees 51' north, 121 degrees 58' west, near Monroe on Mount Si Fault, S. V. Felt over an area of approximately 2,800 square miles, principally in the area on the east side of Puget Sound. Felt by all at Monroe where small objects and furnishings shifted; trees, bushes shaken moderately. Felt by all at Sultan; windows, doors, and dishes rattled. Felt by all at Pinehurst where small objects shifted; doors swung east. Intensity (damage) IV at Carnation, Elbe, Everett (Paine Air Force Base), Granite Falls, Lake Stevens, Longmire, Maple Valley, Marysville, Mukilteo (about 6 miles west of), North Bend Ranger Sta- tion (North Bend), Oso, Preston, Seattle, Startup, and Snohomish. Intensity (damage) I to III at Alderwood Manor, Bothell, Bremerton, Burley, Duvall, Retsil, Sedro Wooley, and Silvana. November 18: 15:48:51*, 20:38:08*. Mount Vernon and Anacortes areas, Washington. Slight shocks felt. November 23: 10:15:25 Washington. Epi- center 46 degrees 40' north, 121 degrees 45' west, Near Long- mire, S. V. Felt over an area of approximately 1,000 square. miles. At Ashford, rapid, brief; felt by and awakened many. Felt by all and awakened many at Longmire; windows and doors rattled; frame creaked. Intensity (damage) IV at Randle. Intensity (damage) I to III at Alder, Elbe (2 1/2 miles east of), and Packwood. December 11: 22:24:17*. Epicenter 48 degrees 44' north 123 degrees 15' west, northwest of Orcas Island, S. V. Felt over an area of approximately 8,000 square miles of northwestern Washington. Very slight damage reported: windows broken at Port Angeles; window cracked at Marysville. INTENSITY (DAMAGE) V: Anacortes.-Rapid, north-south motion felt by all. Blanchard.-Felt by and awakened all. Small objects shifted. Burlington.-Small objects and furnishings shifted. East Sound (Orcas Island).-Frightened all in community. Pendulum clock facing north stopped: small objects and furnishings shifted; one cup fell from shelf. Friday Harbor.-Felt by all; frightened few. Hoodsport.-Felt by several. Small objects shifted. Joyce.-Awakened many and frightened few in community; felt outdoors by some. La Conner.-Felt by all; awakened and frightened few. Langley.-Felt by many (some outdoors); awakened and frightened few. Small objects shifted. Lopez.-Felt by and awakened all. Marietta.-Felt by and awakened many. Marysville.-Window cracked. Orcas Island.-Sharply felt. Loud bang and boom at beginning of shock. Felt throughout the San Juan Islands. Port Angeles.-Felt by several; awakened and frightened few. Windows broken. Roche Harbor.-Felt by several; awakened few; frightened all in home. Trees, bushes shaken slightly. Sequim.-Felt by several; awakened all. Sinclair Island (Urban).-Felt by and awakened many. Rapid, jolting motion; loud blast- like earth noises. Waldron (on Waldron Island).-Felt by sev- eral (some outdoors); frightened few. Small objects shifted. Jolting, south-north motion; loud frightening rumble. INTENSITY (DAMAGE) IV: Blaine, Bow, Brem- erton, Clallam Bay, Clearlake, Clinton, Clipper, Concrete, Coupeville, Darrington, Decatur, Deer Harbor, Des Moines, East Stanwood, Ferndale, Glacier, Greenbank, Hansville, Lakewood, Long- branch, Lynden, Neah Bay, Oakville, Olga, Pinehurst, Port Gamble, Port Ludlow, Rockport, Seattle, Sedro Woolloy, Sekiu, Silvana, Shaw Island, Startup, Sumas, Van Zandt, Westsound, and Wickersham (vicinity of). INTENSITY (DAMAGE) I TO III: Bellingham, Carlsborg, Custer, Everett (near Paine Air Force Base), Everson, Fall City, Granite Falls, Index, Marblemount, Mount Vernon, Nordland, Oso, Port Townsend, Raymond, and Vashon. Also reported felt at Victoria, B. C., Canada.
UW Dept. of Earth and Space Sciences ..... . PNW EARTHQUAKES