- 241.1840 CEEarthquake — Near San Juan Bautista, California (Mw 6.5)
- 242.1638 CEEarthquake — Central New Hampshire (MLg 6.5)
- 243.1953 CEEarthquake — 73 km S of Akhiok, Alaska (Mw 6.47)
- 244.1930 CEEarthquake — 280 km W of Adak, Alaska (Mw 6.47)
- 245.1992 CEEarthquake — 30 km WSW of Ferndale, California (Mw 6.45)
- 246.1968 CEEarthquake — 15 km S of Rampart, Alaska (Mw 6.45)
- 247.1955 CEEarthquake — 84 km E of Nikolski, Alaska (Mw 6.45)
- 248.1932 CEEarthquake — The 1932 Eureka, California Earthquake (Mw 6.45)
- 249.1911 CEEarthquake — Near Morgan Hill, California (Mw 6.45)
- 250.1947 CEEarthquake — 23 km ENE of Ferry, Alaska (Mw 6.44)
- 251.1956 CEEarthquake — 49 km SW of Attu Station, Alaska (Mw 6.43)
- 252.1944 CEEarthquake — 60 km NE of Akutan, Alaska (Mw 6.43)
- 253.1929 CEEarthquake — 14 km SSE of Waimea, Hawaii (Mw 6.43)
- 254.1964 CEEarthquake — 23 km S of Glacier View, Alaska (Mw 6.42)
- 255.1955 CEEarthquake — 122 km WSW of Adak, Alaska (Mw 6.42)
- 256.1916 CEEarthquake — Prince William Sound, Alaska (Mw 6.42)
- 257.1899 CEEarthquake — California (Ms 6.4)· 6 deaths
- 258.2022 CEEarthquake — California, Humboldt County (Mw 6.4)· 2 deaths
- 259.2019 CEEarthquake — California, Ridgecrest, Nevada (Mw 6.4)· 1 deaths
- 260.1980 CEEarthquake — Mexico, Nw (Ms 6.4)· 1 deaths
- 261.2022 CEEarthquake — 15km WSW of Ferndale, Ca (Mw 6.4)
- 262.2020 CEEarthquake — 46 km ESE of Nikolski, Alaska (Mww 6.4)
- 263.2019 CEEarthquake — Ridgecrest Earthquake Sequence (Mw 6.4)
- 264.2018 CEEarthquake — 89 km SW of Kaktovik, Alaska (Mw 6.4)
- 265.2015 CEEarthquake — 52 km ENE of Pedro Bay, Alaska (Mw 6.4)
- 266.2012 CEEarthquake — 118 km WSW of Adak, Alaska (Mww 6.4)
- 267.1999 CEEarthquake — 29 km N of Akhiok, Alaska (Mw 6.4)
- 268.1997 CEEarthquake — 99 km WSW of Adak, Alaska (Mwc 6.4)
- 269.1991 CEEarthquake — Rat Islands, Aleutian Islands, Alaska (Mw 6.4)
- 270.1988 CEEarthquake — 75 km WNW of Ninilchik, Alaska (Mw 6.4)
- 271.1987 CEEarthquake — 65 km WNW of Adak, Alaska (Mw 6.4)
- 272.1986 CEEarthquake — The 1986 Chalfant Valley, California Earthquake (ML 6.4)
- 273.1986 CEEarthquake — Alaska, Andreanof Islands (Mw 6.4)
- 274.1983 CEEarthquake — 46 km WNW of Tatitlek, Alaska (Mw 6.4)
- 275.1979 CEEarthquake — 104 km SSE of Ugashik, Alaska (mb 6.4)
- 276.1979 CEEarthquake — The 1979 Imperial Valley Earthquake, California-Baja California (Mw 6.4)
- 277.1971 CEEarthquake — 92 km WSW of Adak, Alaska (Mw 6.4)
- 278.1964 CEEarthquake — 37 km SSE of Glacier View, Alaska (Mw 6.4)
- 279.1963 CEEarthquake — 61 km ENE of Chignik, Alaska (Mw 6.4)
- 280.1954 CEEarthquake — The 1954 San Jacinto Fault, California Earthquake (Mw 6.4)
- 281.1954 CEEarthquake — The 1954 Eureka-Arcata, California Earthquake (Mw 6.4)
- 282.1947 CEEarthquake — California (M 6.4)
- 283.1941 CEEarthquake — 19 km SSE of Tyonek, Alaska (Mw 6.4)
- 284.1933 CEEarthquake — The 1933 Long Beach, California Earthquake (Mw 6.4)
- 285.1933 CEEarthquake — 20 km SSW of Adak, Alaska (Mw 6.4)
- 286.1933 CEEarthquake — 22 km ENE of Whittier, Alaska (Mw 6.4)
- 287.1925 CEEarthquake — Clarkston Valley, Montana (Aftershock) (Mfa 6.4)
- 288.1915 CEEarthquake — Kaoiki area, Hawaii (ML 6.4)
- 289.1914 CEEarthquake — Near Fernley, Nevada (Mfa 6.4)
- 290.1912 CEEarthquake — Mount McKinley (Denali) area, Alaska (Ms 6.4)
- 291.1906 CEEarthquake — Northwest of Eureka, California (Ms 6.4)
- 292.1901 CEEarthquake — 1901 Parkfield, California Earthquake (Ms 6.4)
- 293.1901 CEEarthquake — California, San Diego (ML 6.4)
- 294.1898 CEEarthquake — South of Sonoma, California (Mw 6.4)
- 295.1894 CEEarthquake — Moloka`i area, Hawaii (Mfa 6.4)
- 296.1892 CEEarthquake — Near Winters, California (Mw 6.4)
- 297.1881 CEEarthquake — Northwest of Mauna Kea, Hawaii (Mfa 6.4)
- 298.1870 CEEarthquake — Moloka`i area, Hawaii (Mfa 6.4)
- 299.1869 CEEarthquake — Northwest of Virginia City, Nevada (ML 6.4)
- 300.1836 CEEarthquake — Near San Juan Bautista, California (Mw 6.4)
Other countries: