Overview

• USGS measured the quake at magnitude 7.8 about 128 km east of Petropavlovsk-Kamchatsky at roughly 10 km depth, followed minutes later by M5.8 and M5.4 aftershocks.
• Tsunami advisories were issued for nearby coasts and Alaska’s western Aleutians, then downgraded or canceled, with no threat to the U.S. West Coast and an all clear for Hawaii.
• Kamchatka authorities issued local warnings and carried out coastal evacuations as emergency crews inspected infrastructure, with no widespread damage or casualties reported.
• USGS and other agencies identified the shock as a major aftershock of the July 29 M8.8 megathrust earthquake along the Kuril–Kamchatka subduction zone.
• Sea-level gauges registered tsunami waves near the source region and forecasts called for modest surges in some areas, while agencies continued monitoring aftershocks and coastal conditions.