An 8.8 magnitude earthquake struck off the coast of Russia's Kamchatka Peninsula, triggering a tsunami warning across the Pacific. The quake, the largest since 2011, occurred near Petropavlovsk-Kamchatsky. Historical data reveals that Kamchatka experienced a magnitude 9.0 quake in 1952, causing damage in Hawaii, while the strongest recorded earthquake was a magnitude 9.5 in Chile in 1960.