The Kamchatka earthquakes were a pair of megathrust earthquakes occurring off the coast of the Kamchatka Peninsula, in Russia on October 16, 1737, and on November 4, 1952, with resulting tsunamis following. A megathrust earthquake occurs at Subduction zones (destructive plate boundaries where one Tectonic plate is forced under (subducts another Russia (Россия Rossiya) or the Russian Federation ( Rossiyskaya Federatsiya) is a transcontinental Country extending Events 456 - Magister militum Ricimer defeats the Emperor Avitus at Piacenza and becomes master of the western Year 1737 ( MDCCXXXVII) was a Common year starting on Tuesday (link will display the full calendar of the Gregorian calendar (or a Events 1333 - Flood of the Arno River, causing massive damage in Florence as recorded by the Florentine chronicler Giovanni Villani Year 1952 ( MCMLII) was a Leap year starting on Tuesday (link will display full calendar of the Gregorian calendar. A tsunami ((tsuːˈnɑːmi is a series of waves created when Both earthquakes occurred at approximately the same location where the Pacific Plate subducts the Okhotsk Plate at the Kuril-Kamchatka Trench. The Pacific Plate is an oceanic Tectonic plate beneath the Pacific Ocean. The Okhotsk Plate is a Tectonic plate covering the Sea of Okhotsk, the Kamchatka Peninsula, and Eastern Japan. The Kuril-Kamchatka Trench or Kuril Trench ( Russian Курило-Камчатский жёлоб) is an Oceanic trench with a maximum depth The depth of the trench at the point of the earthquakes is 7000–7500 meters. Kamchatka also lies at the western end of the Bering fault, between the Pacific Plate and North American Plate. The North American Plate is a Tectonic plate covering most of North America, Greenland and part of Siberia. 
The epicentre of the 1737 earthquake was located at 52. 5°N and 159. 5°E. This earthquake occurred at a depth of 40 km. A magnitude of 9. 3Mw has been estimated.
The main earthquake struck at 16:58 GMT (04:58 local time) on November 4, 1952. Events 1333 - Flood of the Arno River, causing massive damage in Florence as recorded by the Florentine chronicler Giovanni Villani Year 1952 ( MCMLII) was a Leap year starting on Tuesday (link will display full calendar of the Gregorian calendar. Initially assigned a magnitude of 8. 2, the quake was revised to 9. 0 Mw in later years.  A series of tsunami resulted, causing destruction and loss of life around the Kamchatka peninsula and the Kuril Islands. Hawaii was also struck, with estimated damages of up to US$1million and livestock losses, but no human casualties were recorded. Japan also reported no casualties or damage. The tsunami reached as far as Alaska, Chile, and New Zealand. 
The epicentre was located at 52. 75°N and 159. 5°E, at a depth of 30 km. The length of the subduction zone fracture was 600 km. Aftershocks were recorded in an area of approximately 247,000km2, with epicentres at depths of between 40 and 60km.