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Earthquake
History of the Cascadia Region
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1. 1909, magnitude = 6.0 |
2. 1918, magnitude = 7.0 |
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3. 1946, magnitude = 7.4 |
4. 1872, est. magnitude =
7.4 |
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5. 1945, magnitude = 5.5 |
6. 1965, magnitude = 6.5 |
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7. 1939, magnitude = 5.8
1882, magnitude = 5.7 |
8. 1946, magnitude = 6.1 |
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9. 1949, magnitude
= 7.1
2001, magnitude = 6.8 |
10. 1880, magnitude
= 6.0 |
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11.1981, magnitude = 5.5 |
12.1936, magnitude = 5.6 |
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13.1877, magnitude = 5.3;
1962, magnitude = 5.3 |
14. 1993, magnitude = 5.6 |
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15. 1993, magnitude = 5.9;
1993, magnitude = 6.0 |
16. 1873, magnitude = 6.7 |
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17. 1980, magnitude = 7.4 |
18. 1932, magnitude = 6.4;
1954, magnitude = 6.6 |
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19. 1853, magnitude = 5.7;
1860, magnitude = 5.7;
1875, magnitude = 5.8 |
20. 1923, magnitude = 7.3;
1941, magnitude = 6.4;
1947, magnitude = 5.6;
1951, magnitude = 6.0;
1968, magnitude = 5.9;
1987, magnitude = 5.5 |
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21. 1909, magnitude = 6.4 |
22. 1871, magnitude = 5.9;
1890, magnitude = 6.0;
1992, magnitude = 7.1, 6.6, 6.7 |
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23. 1991, magnitude = 6.2 |
24. 1878, magnitude = 5.8 |
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25. 1894, magnitude = 5.8 |
26. 1700, magnitude = 9.0* |
Figure 2. Partial representation of historical
earthquakes, magnitude 5.3 or greater, in the Cascadia Region*.
Numbers represent areas of earthquake occurrence.
* The 1700 earthquake occurred at a plate boundary,
over a large fault area. The cross-hatched area represents the possible
rupture.
** Smaller circles show events of magnitude 5.5 to 6. Larger circles
show events of magnitude 7.0 and higher
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