| Year |
Date |
Time (PST) |
North Latitude |
West Longitude |
Depth (km) |
Mag(felt) |
Mag(inst) |
Maximum Modified Mercalli Intensity |
Felt Area (sq km) |
Location |
References |
| 1872 |
Dec. 14 |
2140 |
48 48' 00" |
121 24' 00" |
shallow(2) |
7.3(4) |
none |
IX(3) |
1,010,000(5) |
North Cascades |
(1) Algermissen, 1983; (2) M.G. Hopper and others, 1982; (3)
Bechtel, Inc., 1976; (4) Malone and Bor, 1979; (5) Rogers, 1983; (6)
Slemmons and others, 1978; (7) Washington Public Power Supply System,
1977 |
| 1877* |
Oct. 12 |
1353 |
45 30' 00" |
122 30' 00"(8) |
shallow(8) |
5.3 |
none |
VII(9) |
48,000(9) |
Portland, Oregon |
(8) Shannon and Wilson, 1975; (9) Thenhaus, 1978 |
| 1880 |
Dec. 12 |
2040 |
47 30' 00" |
122 30' 00"(11) |
? |
? |
none |
VII(10) |
? |
Puget Sound |
(10) Rasmussen and others, 1974; (11) U.S. Army Corps of
Engineers, 1983 |
| 1891 |
Nov. 29 |
1521 |
48 00' 00" |
123 30' 00"(10) |
? |
? |
none |
VII(10) |
? |
Puget Sound |
(12) Rasmussen, 1967; (10) |
| 1893 |
March 6 |
1703 |
45 54' 00" |
119 24' 00"(8) |
shallow |
4.7 |
none |
VII(8) |
21,000(8) |
Southeastern Washington |
(8) |
| 1896 |
Jan. 3 |
2215 |
48 30' 00" |
122 48' 00"(13) |
? |
5.7(11) |
none |
VII(12) |
? |
Puget Sound |
(13) Ruth Ludwin, oral commun., 1987; (11, 12) |
| 1904 |
March 16 |
2020 |
47 48' 00" |
123 00' 00"(5) |
? |
5.3 |
none |
VII(5) |
50,000(5) |
Olympic Peninsula, eastside |
(5, 12) |
| 1909 |
Jan. 11 |
1549 |
48 42' 00" |
122 48' 00"(5) |
deep(5) |
6.0 |
none |
VII(5) |
150,000(5) |
Puget Sound |
(5) |
| 1915 |
Aug. 18 |
0605 |
48 30' 00" |
121 24' 00"(5) |
? |
5.6 |
none |
VI(5) |
77,000(5) |
North Cascades |
(5, 12) |
| 1918* |
Dec. 6 |
0041 |
49 37' 00" |
125 55' 00"(5) |
? |
7.0 |
7.0(17) |
VIII(5) |
650,000(5) |
Vancouver Island |
(5) |
| 1920 |
Jan. 23 |
2309 |
48 36' 00" |
123 00' 00"(5) |
? |
5.5 |
none |
VII(14) |
70,000(5) |
Puget Sound |
(14) Earthquake History of the United States; (5) |
| 1932 |
July 17 |
2201 |
47 45' 00" |
121 50' 00"(15) |
shallow(15) |
5.2 |
none |
VII(15) |
41,000(15) |
Central Cascades |
(15) Bradford and Waters, 1934; (10) |
| 1936 |
July 15 |
2308 |
46 00' 00" |
118 18' 00"(14) |
shallow |
6.4 |
5.75(17) |
VII(14) |
270,000(4) |
Southeastern Washington |
(16) Brown, 1937; (17) Gutenburg and Richter, 1954; (8, 14)
|
| 1939 |
Nov. 12 |
2346 |
47 24' 00" |
122 36' 00"(14) |
deep |
6.2 |
5.75(17) |
VII(14) |
200,000(5) |
Puget Sound |
(18) Coombs and Barksdale, 1942; (4, 11, 17) |
| 1945 |
April 29 |
1216 |
47 24' 00" |
121 42' 00"(14) |
5.9 |
5.5(17) |
VII(14) |
128,000(14) |
Central Cascades |
(14) |
|
| 1946 |
Feb. 14 |
1918 |
47 18' 00" |
122 54' 00"(10) |
40(10) |
6.4 |
6.3(10) |
VII(14) |
270,000(14) |
Puget Sound |
(19) Barksdale and Coombs, 1946; (10, 14) |
| 1946* |
June 23 |
0913 |
49 48' 00" |
125 18' 00"(5) |
deep(5) |
7.4 |
7.3(17) |
VIII(4) |
1,096,000(5) |
Vancouver Island |
(5, 14) |
| 1949 |
April 13 |
1155 |
47 06' 00" |
122 42' 00" |
54(20) |
7.0 |
7.1(17) |
VIII(22) |
594,000(5) |
Puget Sound |
(20) Baker and Langston, 1987; (21) Gonen and Hawkins, 1974; (22) Nuttli, 1952; (23) Thorsen, 1986; (24) U.S. Army Corps of Engineers, 1949; (25) Weaver and Baker, 1988; (5, 10, 12, 17) |
| 1949* |
Aug. 21 |
2001 |
53 37' 20" |
133 16' 20"(5) |
7.8 |
8.1(17) |
VIII |
2,220,000(14) |
Queen Charlotte Is., B.C. |
||
| 1959 |
Aug. 5 |
1944 |
47 48' 00" |
120 00' 00"(4) |
35(4) |
5.5 |
5.0(4) |
VI(12) |
64,000(14) |
North Cascades, eastside |
(4, 10, 14) |
| 1959* |
Aug. 17 |
2237 |
44 49' 59" |
111 05' (26) |
10-12(27) |
7.6 |
7.5(26) |
X(26) |
1,586,000(26) |
Hebgen Lake, Montana |
(26) Stein and Bucknam, 1985; (27) U.S. Geological Survey, 1963 |
| 1962* |
Nov. 5 |
1936 |
45 36' 30" |
122 35' 54"(29) |
18(28) |
5.3 |
5.5(30) |
VII(14) |
51,000(14) |
Portland, Oregon |
(28) Berg and Baker, 1963; (29) Couch and others, 1968; (30) Dehlinger and Berg, 1962; (31) Dehlinger and others, 1963; (14) |
| 1965 |
April 29 |
0728 |
47 24' 00" |
122 24' 00"(32) |
63(35) |
6.8 |
6.5(32) |
VIII(14) |
500,000(5) |
Puget Sound |
(32) Algermissen and Harding, 1965; (33) Ihnen and Hadley, 1986; (34) Langston, 1981; (35) Langston and Blum, 1977; (36) MacPherson, 1965; (37) Mullineaux and others, 1967; (14) |
| 1981 |
Feb. 13 |
2209 |
46 21' 01" |
122 14' 66"(38) |
7(36) |
5.8 |
5.5(38) |
VII(39) |
104,000(40) |
South Cascades |
(38) Grant and others, 1984; (39) Qamar and others, 1987; (40) U.S. Earthquakes, 1981 |
| 1983* |
Oct. 28 |
0606 |
44 03' 29" |
113 51' 25"(41) |
14(42) |
7.2 |
7.3(38) |
VII(42) |
800,000(42) |
Borah Peak, Idaho |
(41) Richins and others, 1987; (42) Stover, 1987 |