Japan’s Pacific coast was struck by tsunami waves on Wednesday triggered by a powerful 8.8-magnitude earthquake off Russia’s Kamchatka Peninsula, prompting widespread evacuation orders and heightened alertness across the region. The quake, one of the strongest ever recorded, struck at 11:24 a.m. local time, centred 126 kilometres southeast of Petropavlovsk-Kamchatsky, Russia, at a depth of 19.3 kilometres. Tsunami warnings were issued across Japan, Alaska, Hawaii, and other Pacific regions, with Japan’s Meteorological Agency (JMA) urging immediate action to protect lives.
The JMA initially issued a tsunami advisory, which was upgraded to a warning at 9:40 a.m. for coastal areas from Hokkaido to Wakayama Prefecture, predicting waves up to 3 meters. “Those near the coast should evacuate immediately to higher ground or safe buildings,” said Japan’s Chief Cabinet Secretary, Yoshimasa Hayashi, emphasising the potential for multiple waves. “Second and third waves of tsunamis can be even higher.” By midday, waves of 1.3 meters were recorded at Kuji Port in Iwate Prefecture, 80 centimetres in Nemuro, Hokkaido, and 70 centimetres at Ishinomaki Port in Miyagi Prefecture. Smaller waves of 30 centimetres reached Yokohama Port, indicating the tsunami’s broad reach along Japan’s eastern seaboard.
Over 2 million people across 229 municipalities were advised to evacuate, with more than 900,000 residents in 133 municipalities under mandatory evacuation orders. Japan’s disaster preparedness, honed since the devastating 2011 Tohoku earthquake and tsunami, facilitated swift evacuations. Residents in Hokkaido and Tohoku fled to higher ground, with footage showing factory workers and families gathering on hills overlooking the ocean. The JMA’s Kiyomoto warned, “Tsunami are now continuing to be observed, with cycles of about one hour. High tsunami are possible, and conditions for damage remain for at least a day.” He urged residents to stay vigilant, particularly during high tide, and avoid returning to coastal areas despite the heat.
Transportation across Japan faced significant disruptions. Sendai Airport closed its runways, and flights were rerouted. Commuter trains, including the Tokaido, Yokosuka, and Shonan-Shinjuku lines, were suspended, stranding passengers. Ferries connecting Hokkaido, Aomori, and Tokyo’s nearby islands were halted. The Fukushima Daiichi nuclear plant, scarred by the 2011 disaster, reported no abnormalities, but 4,000 workers were evacuated to higher ground as a precaution, with remote monitoring ensuring safety, according to Tokyo Electric Power Company Holdings.
The JMA downgraded some warnings to advisories by late afternoon, but cautioned that dangerous currents and waves could persist. “People should exercise caution until all alerts are lifted,” the agency stated. The government established an information liaison office at the Prime Minister’s crisis management centre to coordinate with local authorities. Unlike the 2011 tsunami, which killed over 18,000 people, no fatalities or significant structural damage were reported in Japan by midday, though one minor injury was noted.
The earthquake’s impact extended beyond Japan. In Russia, Severo-Kurilsk’s fishing port was flooded by waves up to 5 meters, washing boats out to sea. Hawaii downgraded its tsunami warning to an advisory after 6-foot waves caused no major damage, with Governor Josh Green noting, “So far, we have not seen a wave of consequence.” California reported a rapid surge in water levels at Port San Luis, while French Polynesia anticipated waves up to 2.2 meters in the Marquesas Islands.
Japan’s advanced S-net earthquake-detection network, completed in June 2025, provided critical early warnings, allowing seconds to minutes for evacuations. As aftershocks continued, the JMA stressed preparedness, dismissing doomsday predictions from manga artist Ryo Tatsuki’s “The Future I Saw.” Director Ayataka Ebita stated, “We ask that people base their understanding on scientific evidence.” Japan remains on high alert, with coastal communities bracing for potential further waves.
