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United States Geological Survey (USGS): One of the most powerful earthquakes in over a decade struck off Russia’s Kamchatka Peninsula.

On July 30, 2025 (local time), a magnitude 8.8 earthquake rocked the seafloor east of Petropavlovsk-Kamchatsky, making it the largest earthquake since Japan’s 2011 Tohoku disaster and among the top ten largest earthquakes ever instrumentally recorded.

This wasn’t just a single point on a map—USGS modeling shows the quake ruptured a fault zone roughly 500 km long and 150 km wide, caused by the massive Pacific plate diving beneath the North American plate in one of the fastest subduction zones on Earth.

The region had been shaking for 10 days, with over 50 magnitude 5.0+ quakes leading up to the mainshock—including a magnitude 7.4. And it didn’t stop there: dozens of aftershocks followed, including magnitude 6.9 and 6.3 events.

This area, part of the Kuril-Kamchatka subduction zone, has a long history of megaquakes—including an Mw 9.0 in 1952 that occurred just 30 kilometers away.

Seismic history matters. At 80 mm/year of tectonic movement, this region has built up over 6 meters of strain since 1952—now partially released.