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Source: Everything.explained.today, Washington Edu, Wikipedia

The 1952 Severo-Kurilsk earthquake struck off the coast of the Kamchatka Peninsula. The 9.0 M_w earthquake triggered a major tsunami that hit Severo-Kurilsk, Kuril Islands, Sakhalin Oblast, Russian SFSR, USSR, on 4 November 1952 at 16:58 (UTC). This led to the destruction of many settlements in Sakhalin Oblast and Kamchatka Oblast, while the main impact struck the town of Severo-Kurilsk. It was the fifth most powerful earthquake since 1900, and to date, the most powerful earthquake in Russian history.

Tsunami

The tsunami was generated 130km (80miles) offshore Kamchatka, impacting Severo-Kurilsk with three waves about 15- high. After the earthquake the majority of the Severo-Kurilsk citizens fled to the surrounding hills, where they escaped the first wave. However, most of them returned to the town and were killed by the second wave. According to the authorities, out of a population of 6,000 people, 2,336 died. The survivors were evacuated to continental Russia. The settlement was then rebuilt in another location.