A devastating 8.8-magnitude earthquake struck off Russia’s far eastern Kamchatka Peninsula early Wednesday, triggering a tsunami that hit coastal areas of both Russia and Japan. The quake, the strongest to hit the region since 1952, also prompted widespread tsunami warnings across the northern Pacific, including China, the United States, and several island nations.
According to the US Geological Survey (USGS), the undersea quake was shallow, at a depth of 19.3 km, and centred about 125 km east-southeast of Petropavlovsk in the Kamchatka Peninsula along the coast of Avacha Bay. Initial reports revised the magnitude from 8.0 to 8.8 as tremors violently shook buildings, with videos showing swaying furniture and visible damage in residential areas.
Shortly after the quake, tsunami waves began hitting the Russian Kuril Islands. The main settlement of Severo-Kurilsk experienced the first wave, leading to immediate evacuation efforts. Regional governor Valery Limarenko confirmed that residents were safe and taking shelter on higher ground until the all-clear signal was given.
A massive 8.7 magnitude earthquake rocks Russia’s Kamchatka Peninsula triggering 4m high tsunami waves.
Heavy losses in infrastructures.
Evacuations underway across Kamchatka and Japan’s eastern coast.
Worst quake in decades! #Earthquake #Tsunami pic.twitter.com/zaE9bCwe86
— Sunanda Roy 👑 (@SaffronSunanda) July 30, 2025
In Japan, tsunami waves also reached the northern island of Hokkaido. The Japan Meteorological Agency reported a 30 to 40 centimetre wave hitting the eastern coast at Nemuro. While the wave height was relatively low, authorities remained on high alert, urging coastal residents to stay vigilant due to the possibility of additional waves or aftershocks.
The Pacific Tsunami Warning Center confirmed that the massive undersea quake had generated tsunami waves across the northern Pacific basin. In the United States, coastal states such as Alaska, Oregon, and Hawaii were placed under tsunami advisories. Sirens were sounded in Honolulu, prompting residents to move to higher ground. Authorities warned of possible waves ranging from 1 to 3 feet and advised the public to avoid beaches and vulnerable low-lying zones until the threat had completely subsided.
China’s Tsunami Advisory Center under the Ministry of Natural Resources also issued an alert, warning that tsunami waves between 30 centimetres and one metre could strike parts of the country’s eastern seaboard. The agency said damage was likely in certain coastal areas and urged relevant regions to take preventive action. Meanwhile, Indonesia and the Philippines also issued precautionary warnings along their coastlines.
WAVES NOW ARRIVING TO JAPAN.
Wave height is now rapidly increasing in the coast of Japan as the first waves being to arrive.
Evacuate or get to higher ground if under a warning! #earthquake #tsunami pic.twitter.com/9CgCFyeTvS
— Vortix (@VortixWx) July 30, 2025
Experts from the Kamchatka branch of the Geophysical Service of the Russian Academy of Sciences described the earthquake as the strongest in more than 70 years and warned of significant aftershocks, possibly reaching magnitudes as high as 7.5.
While no major casualties have yet been reported, emergency services in the affected regions remain on high alert, with damage assessments and safety operations underway. The full scale of the impact is still unfolding as aftershocks and secondary waves remain a possibility.
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