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Peak ground shaking reached MMI VIII (Severe) in cities like Petropavlovsk-Kamchatsky (population ~187,000) and Severo-Kurilsk. Tsunami Generation and Pacific Impact

Within 24 hours of the quake, Klyuchevskaya Sopka , Eurasia's highest active volcano, began erupting. On August 3, the Krasheninnikov volcano produced a 6-km eruption plume—its first known historical activity. 8.8The Last of Us

The mainshock was preceded by a magnitude 7.4 foreshock on July 20, 2025, which signaled heightened strain in the region. Peak ground shaking reached MMI VIII (Severe) in