A strong earthquake registered by the USGS as M6.1 hit off the east coast of Kamchatka, Russia at 16:07 UTC on October 3, 2025. The agency is reporting a depth of 17.4 km (10.8 miles). EMSC is reporting the same magnitude and depth.
The epicenter was located 173 km (107 miles) SE of Vilyuchinsk (population 25 204) and 178 km (111 miles) SSE of Petropavlovsk-Kamchatsky (population 181 216).
This is yet another aftershock of the tsunami-producing M8.8 earthquake on July 29, 2025. That quake generated a Pacific-wide tsunami and ranked as the sixth strongest earthquake ever recorded instrumentally. The event ruptured a large portion of the Kuril–Kamchatka subduction zone, with ground displacement recorded across southern Kamchatka.Satellite and geodetic data indicate that southern Kamchatka shifted horizontally by up to 2 m (6.6 feet) during the rupture. The deformation was widespread, with coastal subsidence and uplift altering local topography. Such large-scale displacements are consistent with megathrust events of this magnitude.
Since the July 29 rupture, the region has experienced multiple strong aftershocks, including a powerful M7.8 earthquake on September 18, 2025, which again triggered hazardous tsunami warnings
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