4/17/26
On Monday, April 20th, a strong earthquake with a magnitude of 7.7 hit the northeastern coast of Japan, which caused a three meter tsunami warning. Authorities said, “The threat was later revised down to a tsunami advisory.” This happens when there is a possibility of a tsunami producing strong waves or currents which can be very dangerous for any individual near where the water is impending.
The Japan Meteorological Agency is an independent part of Japan’s Ministry of Infrastructure, Transport, Land, and Tourism that is responsible for forecasting warning services of weather and national disasters such as volcano activity, earthquakes, and tsunamis. The agency had published a three meter tsunami warning for the Iwate Prefecture and parts within Aomori and Hokkaido, which became an advisory later on. The advisory was also released into other areas within the northeastern part of Japan, evaluating a tsunami up to one meter that was considered to be extremely dangerous. The agency warns that an aftershock with a very similar magnitude could potentially happen in the coming week.
So far, the observations of any tsunami waves are currently below the warning level that was issued. According to the data from the meteorological agencies, “One 0.8 meter tsunami struck Kuji Port in Iwate Prefecture.” On the other hand, another tsunami of 0.4 meter hit Miyako Port in Iwate Prefecture. Furthermore, the US Tsunami Warning System reported that the magnitude of the earthquake in the east coast of Honshu, Japan was 7.4 meters. This threat was issued around 8:52 UTC (4:52 a.m. ET). However, the Japan’s National Agency revised its figure to 7.7 magnitude; it’s unknown what the cause was.
Japan’s Disaster Management Agency said, “It had issued evacuation orders to 171,957 people in five prefectures.” On Monday evening, Chief Cabinet Secretary Minoru Kihara said, “No injuries or damage to homes have been recorded yet.” He also added, “There were 200 power outages across the impacted areas and authorities were working to restore service.”
After the earthquake, the Japanese Prime Minister told reporters in a news briefing, “Residents in areas where tsunami warnings have been issued should immediately evacuate to higher ground or safer locations such as evacuation buildings.” She also said, “Authorities are doing their utmost to assess the damage, implement emergency disaster response measures such as search and rescue operations and provide timely and accurate information to the public.”
