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1.1: Significant Historical Earthquakes in the Pacific Northwest

  • Page ID
    6538
  • Date Magnitude Source Comments
    Jan. 26, 1700 9 SZ Dated by Japanese tsunami
    Oct. 23, 1853 5.7 ? Eureka area, wharf sank 4 feet, intensity VII
    Mar. 20, 1855 ? ? Eureka, intensity VI, affected the flow of streams
    Jun. 14, 1857 ? ? Eureka, intensity VI
    Nov. 13, 1860 5.7 ? Humboldt Bay, chimney, plaster damage, VII
    Oct. 29, 1864 5.5 SC Georgia Strait
    Oct. 1, 1865 5.4-5.7 ? Eureka, fissure Ft. Humboldt, VII-VIII
    Mar. 2, 1871 5.9 ? Petrolia, damage Rohnerville, intensity VIII
    Dec. 15, 1872 6.8 CR Entiat, WA
    Nov. 23, 1873 6.7 SC CA-OR border, damage to Crescent City
    Sep. 30, 1875 5.8 ? SE of Eureka, intensity VII
    Oct. 12, 1877 5.2 CR Portland, OR, intensity VII, 2 events
    May 9, 1878 5.8 TF Mendocino FZ, chimneys collapsed to Petrolia
    Apr. 30, 1882 <6? SC? South Puget Sound
    Jan. 28, 1884 5.7 ? N. of Hoopa, intensity V
    Jul. 25, 1890 6 ? Damage at Ferndale and Petrolia, CA
    Nov. 29, 1891 ? ? Puget Sound
    Sep. 30, 1894 5.6-5.8 ? Neat Miranda, S Humboldt Co.
    Jan. 3, 1896 5.3 ? N. Puget Sound
    Apr. 15, 1898 6.8 ? Mendocino coast, Ft. Bragg-Greenwood, intensity IX
    Apr. 16, 1899  6.4 SO Offshore Arcata, damage to Eureka, CA, Gorda Plate
    Dec. 9, 1903 ? SO Offshore Eureka
    Mar. 17, 1904 5.3 ? 60 km NW Seattle, intensity VII
    Apr. 23, 1906  6.4  ? McKinleyville, Ferndale, Eureka, Trinidad, intensity VII
    Jan. 11, 1909 6 SC San Juan and Gulf islands, intensity VII
    May 18, 1909 ? ? Petrolia, chimneys damaged, intensity VIII
     Oct. 28, 1909 6.4 ? Rio Dell, Rohnerville, Upper Mattole, intensity VIII
    Mar. 19, 1910 6 SO Offshore Petrolia, intensity V
    Aug. 22, 1914 6.75 TF Blanco Fracture Zone
    Dec. 31, 1915 6.2-6.5 ? Offshore Cape Mendocino
    Aug. 18, 1915 5.6 CR North Cascades, VII
    Jun. 10, 1917 6.5 TF Blanco Fracture Zone
    Jul. 15, 1918 6-6.5 SO Offshore Arcata, VI
    Dec. 6, 1918 7 CR Vancouver Island W. coas
    Sep. 15, 1919 ? ? Eureka, Chimneys fell, intensity VI
    Jan. 24, 1920 5.5 SC Georgia Strait
    Jan. 26, 1922 6 TF? Offshore Cape Mendocino
    Jan. 31, 1922 7.3-7.6 SO 37 mi. W of Arcata, CA, VI, felt Klamath Falls
    Jan. 22, 1923 6.5-7.3 TF Mendocino FZ; damage at Petrolia, intensity VIII
    Feb. 24, 1924 5.75 TF Blanco Fracture Zone
    Jun. 4, 1925 6 ? Offshore W of Orick, CA
    Jun. 5, 1926 6 TF Blanco Fracture Zone
    Dec. 10, 1926 6 SO Gorda Plate, 80 mi. W of Eureka, CA
    Feb. 9, 1928 5.8 SC? SW Vancouver Island
    Sep. 11, 1928 6.3 TF Blanco Fracture Zone
    May 26, 1929 7.0 TF SE end of Queen Charlotte Fracture Zone
    Sep. 23, 1930 5-5.5 ? Chimneys fell in Eureka, VII
    Mar. 10, 1931 5.6 ? Offshore C. Mendocino
    Sep. 9, 1931 5.8 ? Offshore Eureka, chimneys damaged, intensity VI
    Mar. 2, 1932 5.6 TF? 112 mi W. C. Mendocino
    Jun. 6, 1932 6.4 SC One death at Arcata, damage at Eureka
    Jun. 20, 1932 5.5 TF Blanco Fracture Zone
    Jul. 17, 1932 5.2 CR Duvall, NE of Seattle, VII
    Mar. 26, 1933 5.5 TF Blanco Fracture Zone
    Jul. 6, 1934 6.5 SO 56 mi. W of Trinidad, CA
    Jan. 2, 1935 5.8 ? Offshore C. Mendocino, intensity V
    Apr. 30, 1936 5.5 TF Blanco Fracture Zone
    Jun. 3, 1936 5.8 TF? 93 mi. W. C. Mendocino
    Jul. 16, 1936 5.1-5.5 CR Milton-Freewater, near OR-WA border
    Sep. 25, 1936 6.2 TF Blanco Fracture Zone
    Nov. 5, 1936 6 TF Blanco Fracture Zone
    Feb. 6, 1937 5.7-5.8 ? Offshore C. Mendocino, slight damage
    Nov. 10, 1937 5.75 TF Blanco Fracture Zone
    Aug. 3, 1938 5.6 TF Blanco Fracture Zone
    Sep. 11, 1938 5.5 ? SE C. Mendocino, slight damage Ferndale
    Nov. 13, 1939 5.5-6.2 SC Puget Sound region, intensity VII
    Nov. 17, 1940 6 TF Blanco Fracture Zone
    Nov. 19, 1940 5.5 ? Offshore C. Mendocino, slight damage
    Feb. 9, 1941 6.4-6.6 SO 60 mi. W of Eureka, NW C. Mendocino
    May 13, 1941 6 ? Offshore C. Mendocino
    Oct. 2, 1941 6.4 SC 30 mi. W of C. Mendocino
    Oct. 31, 1941 5.5 TF Blanco Fracture Zone
    Mar. 6, 1944 5.75 TF Blanco Fracture Zone
    Dec. 30, 1944 5.75 TF Blanco Fracture Zone
    Apr. 29, 1945 5.9 CR 50 km SE of Seattle, intensity VII
    May 19, 1945  6.2 ? Offshore C. Mendocino
    Feb. 15, 1946 5.6-6.4 SC Puget Sound region
    Jun. 23, 1946 7.3 CR Central Vancouver Island
    Sep. 23, 1947 5.6 ? Offshore C. Mendocino, intensity VII
    May 25, 1948 5.5 TF Blanco Fracture Zone
     May 25, 1948 5.8 TF Blanco Fracture Zone
    Mar. 24, 1949 5.9 SO 93 mi. W of Orick
    Apr. 13, 1949 7.1 SC Olympia, WA, intensity VIII
    Aug. 22, 1949 8.1 TF Queen Charlotte Fracture Zone
    Aug. 24, 1949 5.5 TF Blanco Fracture Zone
    Feb. 23, 1951 5.6 TF Blanco Fracture Zone
    Jun. 16, 1951 5.5 TF Blanco Fracture Zone
    Jun. 17, 1951 6 TF Blanco Fracture Zone
    Oct. 8, 1951 5.8-6 TF 6 mi W of Punta Gorda
    Aug. 20, 1952 6 TF Blanco Fracture Zone
    Nov. 25, 1954 6.1-6.3 TF 65 mi. W Punta Gorda, Mendocino Fracture Zone
    Dec. 21, 1954 6.5-6.6 CR $3.1 million damage, 1 death, 12 mi NE Arcata
    Aug. 23, 1955 6.25 TF Blanco Fracture Zone
    Feb. 19, 1956 6.8 SO Pacific Plate NW of Vancouver Is.
    Oct. 11, 1956 6 ? NW of C. Mendocino, slight damage Ferndale
    Dec. 21, 1956 6.7 SO small plate near Queen Charlotte Fracture Zone
    Dec. 16, 1957 5.9 SO W. of Vancouver Is., NE of Nootka Fault
    Jul. 23, 1959 5.8 SO 56 mi. W Trinidad, CA
    Aug. 5, 1959 5-5.5 CR near Chelan, WA, intensity VI
    Sep. 26, 1959 6.1 TF Blanco Fracture Zone
    Jun. 5, 1960 5.7 SO Offshore Arcata, intensity VI
    Aug. 9, 1960 6-6.2 TF Felt S. OR to San Francisco
    Apr. 6. 1961 5.5 TF 11 mi W C. Mendocino, landslides
    Aug. 23, 1962 5.6 SO Offshore Crescent City
    Nov. 5, 1962 5.2-5.5 CR OR-WA border near Portland, OR, VII
    Jul. 13, 1964 5.5 TF Blanco Fracture Zone
    Oct. 1, 1964 5.5 TF Blanco Fracture Zone
    Oct. 29, 1964 5.5 SC Georgia Strait
    Apr. 29, 1965 6.5 SC Seattle, WA, intensity VIII
    May 31, 1965 5.5 TF Blanco Fracture Zone
    Dec. 10, 1967 5.6-5.8 TF 12 mi. W. of Petrolia, CA, slight damage
    May 8, 1968 6.1 TF Blanco Fracture Zone
    Jun. 26, 1968 5.5-5.9 TF Offshore C. Mendocino
    May 8, 1969 5.5 TF Blanco Fracture Zone
    Jun. 24, 1970 7.4 TF? Queen Charlotte TF or N. America Plate
    Nov. 26, 1970 6 TF Blanco Fracture Zone
    Mar. 13, 1971 6.1 SO W. of Vancouver Island
    Jul. 23, 1972 6.4 SO W. of Vancouver Island
    Jun. 7, 1975 5.2-5.7 SC Fortuna, CA
    Nov. 26, 1976 6.3 SO Gorda Plate, 93 mi. NW of Eureka
    Dec. 9, 1976  5.5 TF Blanco Fracture Zone
    Dec. 20, 1976 6.7 SO W. of Vancouver Is.
    Jun. 2, 1978 5.5 CR Brooks Peninsula, NW Vancouver Is.
    Jul. 25, 1978 5.5 CR Brooks Peninsula, NW Vancouver Is.
    May 18, 1980 5.1 CR Eruption of Mt. St. Helens
    Nov. 8, 1980 6.9-7.4 SO 30 mi. W Trinidad, $1.75 million damage
    Dec. 17, 1980 6.8 SO W. of Vancouver Is.
    Feb. 14, 1981 5.5 CR Elk Lake, WA on St. Helens seismic zone
    Nov. 3, 1981 6.4 TF Blanco Fracture Zone
    Aug. 24, 1983 5.5 TF Offshore C. Mendocino
    Sep. 10, 1984 6.6 TF 166 mi W of Eureka, felt OR to San Francisco
    Mar. 13, 1985 6.3 TF Blanco Fracture Zone
    Jul. 31, 1987 5.5 SO or SC Just off C. Mendocino
    Oct. 23, 1988 5.5 TF Blanco Fracture Zone
    Jul 13, 1991 6.7-6.9 SO 50 mi WNW of Crescent City
    Aug. 16, 1991 5.9-6.3 SO 62 mi W of Crescent City
    Aug. 17, 1991 6.2 CR Honeydew, CA, chimney, foundation damage
    Aug. 17, 1991 6.9-7.1 SO 62 mi W of Crescent City
    Mar. 7, 1992 5.3-5.6 CR S. of Petrolia, landslides, foundation damage
    Apr. 6, 1992 6.8 TF W. Vancouver Is., Revere-Dellwood-Wilson Fracture Zone
    Apr. 25, 1992 7.1 SZ Tsunami, coastal uplift, $48 million damage
    Apr. 26, 1992 6.6 SO 17 mi. WNW Petrolia, damage to Scotia
    Apr. 26, 1992 6.7 SO 16 mi. W Petrolia, added damage
    Aug. 21, 1992 5.5 TF Blanco Fracture Zone
    Mar. 25, 1993 5.6 CR Scotts Mills, OR, E of Salem
    Apr. 26, 1993 6.5 SO 15 mi W of Petrolia
    Sep. 20, 1993 6 TF Mendocino Fracture Zone, 85 mi W C. Mendocino
    Sep. 20, 1993 5.9, 6 CR 2 eqs. W. Klamath Falls, OR
    Sep. 1, 1994 6.9-7.2 TF 88 mi. W C. Mendocino, felt OR to San Francisco
    Oct. 27, 1994 5.6 TF Blanco Fracture Zone
    Feb. 18, 1995 6.6 SO 88 mi. WSW Eureka
    Jul. 24, 1996 6 SO 115 mi. W Crescent City
    Jan. 21, 1997 5.7 TF 1 mi NW of Punta Gorda
    Oct. 4, 1997 5.7 SO 65 mi. W Trinidad, CA
    Nov. 27, 1998 5.6 SO 60 mi. W Ferndale, CA
    Jul. 2, 1999 5.8 SC Satsop, WA 
    Jan. 20, 2000 6.1 TF Blanco Fracture Zone
    Mar. 16, 2000 5.9 TF 52 mi W Petrolia
    Jun. 2, 2000 6.2 TF Blanco Fracture Zone
    Jan. 13, 2001 5.6 SO 62 mi. W Eureka
    Feb. 28, 2001 5.6 SO Nisqually Earthquake, S. Puget Sound, VII-VIII
    Jul. 9, 2002 6 TF Blanco Fracture Zone
    Sep. 2, 2002 5.7 TF Blanco Fracture Zone
    Jan. 16, 2003 6.2 TF Blanco Fracture Zone
    Nov. 19, 2007 5.8 TF Blanco Fracture Zone
    Mar. 30, 2008  5 TF TFBlanco Fracture Zone (swarm)
    Mar. 8, 2011 5 TF Blanco Fracture Zone
    Oct. 27, 2012 7.8 TF Queen Charlotte Fracture Zone
    Apr. 24, 2014 4.8 TF Queen Charlotte Fracture Zone
    Nov. 27, 2014 4 CR Sheldon Wildlife Refuge, NV (swarm)
    Jan. 28, 2015 5.7 TF Mendocino Fracture Zone

    Magnitudes for pre-seismograph earthquakes are corrected intensity magnitudes where available. Key to source: CR, crustal; SO, slab, offshore; SC, slab, beneath the continent; SZ, subduction zone; TF, transform fault