Overview

• Tsunami waves peaked over 3 meters in Russia’s northern Kuril Islands and reached just 1.22 meters in Crescent City, resulting in minimal coastal damage
• Dozens of aftershocks as strong as magnitude 7 have struck near the Kuril Islands and across Kamchatka since the July 30 megathrust earthquake
• Preliminary finite fault models indicate up to 10 meters of slip along an 18° plane at depths exceeding 20 km, limiting vertical seafloor uplift and wave energy
• Eruptions at Klyuchevskoy and the first recorded activity at Krasheninnikov in 600 years have accompanied the seismic unrest, prompting aviation alerts and raised volcanic surveillance
• Early-warning centers coordinated evacuations of more than two million residents across Pacific-rim nations, demonstrating the effectiveness of updated tsunami monitoring and response systems