Kamchatka earthquakes
Three earthquakes, which occurred off the coast of Kamchatka Peninsula in far eastern Russia and the Soviet Union in 1737, 1923 and 1952, were megathrust earthquakes and caused tsunamis. They occurred where the Pacific Plate subducts under the Okhotsk Plate at the Kuril-Kamchatka Trench. The depth of the trench at the point of the earthquakes is 7,000–7,500 m. Northern Kamchatka lies at the western end of the Bering fault, between the Pacific Plate and North American Plate, or the Bering plate There are many more earthquakes and tsunamis originating from Kamchatka, of which the most recent was the 1997 Kamchatka earthquake and tsunami originating near the Kronotsky Peninsula.
The epicentres of the 1737 earthquake was located at 52°30′N 159°30′E / 52.5°N 159.5°E. This earthquake occurred at a depth of 40 km. A magnitude of 8.3 Ms (9.0Mw) has been estimated.
On February 4, 1923, an estimated magnitude 8.3–8.5 Mw earthquake with an approximate location of 54°00′N 161°00′E / 54.0°N 161.0°E triggered an 8 m tsunami that caused considerable damage in Kamchatka, with a number of reported deaths. The tsunami was still 6 meters high when it reached Hawaii, causing at least one fatality. There was another earthquake and tsunami in April 1923, which caused locally high tsunami runup near Ust' Kamchatsk, leaving a deposit studied by Minoura and others.
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