Many major earthquakes have occurred in the region of the Kamchatka Peninsula in far eastern Russia. Events in 1737, 1923 and 1952, were megathrust earthquakes and caused tsunamis. There are many more earthquakes and tsunamis originating from the region. Tectonic setting The southern part of the Kamchatka peninsula lies above the convergent plate margin where the Pacific Plate is subducting beneath the Okhotsk Plate along the line of the Kuril–Kamchatka Trench. The rate of convergence between the two plates is about 86 mm per year. Earthquakes are generated by rupture along the megathrust boundary between the two plates, within the descending Pacific Plate and within the overriding Okhotsk Plate. The northern part of the peninsula lies away from the convergent boundaries of the Kuril–Kamchatka Trench and the Aleutian Trench but across the boundary between two blocks within the North American Plate, the Kolyma-Chukotka and Bering Sea microplates. This boundary accommodates both active shortening and right lateral strike-slip across a series of large SW–NE trending faults. 1737 earthquake The epicentre of the 1737 earthquake was located at . This earthquake occurred at a depth of 40 km (25 miles). A magnitude of 8.3 Ms (9.0Mw) has been estimated. 1841 earthquake An earthquake of estimated magnitude 9.0 , with an epicenter just offshore, which triggered a large tsunami. 1923 earthquakes On February 3, 1923, an estimated magnitude 8.3–8.5 Mw earthquake with an approximate location of triggered a 25-foot tsunami that caused considerable damage in Kamchatka, with a reported 3 deaths. The tsunami was still 6 meters (20 feet) 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. 1952 earthquake The main earthquake struck at 16:58 GMT (04:58 local time) on November 4, 1952. Initially assigned a magnitude of 8.2, the quake was revised to 9.0 Mw in later years. A large tsunami resulted, causing destruction and loss of life around the Kamchatka peninsula and the Kuril Islands. Hawaii was also struck, with estimated damage of up to US$1 million and livestock losses, but no human casualties were recorded. Japan reported no casualties or damage. The tsunami reached as far as Alaska, Chile, and New Zealand. The hypocentre was located at , at a depth of 30 km (18.6 miles). The length of the subduction zone