On the 30th, a strong earthquake struck the Kamchatka Peninsula in Russia, prompting a tsunami advisory for the Pacific coastal region of Japan. A tsunami warning was issued for some areas.
According to NHK, around 8:25 a.m. that day, an earthquake with a magnitude of 8.7 occurred in the Kamchatka Peninsula, Russia. It was initially estimated to have a magnitude of 8.0, but this was revised to reflect the stronger earthquake. The U.S. Geological Survey (USGS) reported that the earthquake's depth was 19.3 km.
A magnitude 6.9 aftershock occurred around 9:09 a.m. in the Kamchatka Peninsula. The depth of the aftershock was 10 km.
The Japan Meteorological Agency issued a tsunami advisory for the Pacific coastal region from Hokkaido to Kyushu, but upgraded it to a tsunami warning for the eastern region of Japan around 9:40 a.m. The expected tsunami height also increased from 1 meter to 3 meters.
NHK reported that the Japanese government has issued an emergency evacuation order. The NHK announcer urged residents in areas likely to be affected by the tsunami to "evacuate to the highest possible location immediately."
The areas under tsunami warning include eastern, central, and western coastal Hokkaido, the Pacific coastal area of Aomori Prefecture, Fukushima Prefecture, Ibaraki Prefecture, Chiba Prefecture, Shizuoka Prefecture, and the Ogasawara Islands.
Tokyo Bay, Osaka, and the Seto Inland Sea in Hyogo Prefecture are under a tsunami advisory.
The time tsunami waves are expected to reach varies by region. The eastern and central Pacific coastal areas of Hokkaido will be affected at 10 a.m., Aomori Prefecture's Pacific coast at 10:30 a.m., Fukushima Prefecture at 11 a.m., and Shizuoka Prefecture at 11:30 a.m.