7.7 Japan Earthquake Unleashes Tsunami Scare in Hokkaido
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A tsunami warning in Japan is raising questions. Here's how tsunamis form, why warnings change and what people far from the coast should know.
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Data: Japan tsunami waves of up to 3m forecast for Hokkaido, Aomori and Iwate
Japan's Meteorological Agency has forecast tsunami waves of up to 3m for Pacific coastal areas of central Hokkaido, Aomori and Iwate prefectures following a magnitude 7.4 earthquake off the Sanriku coast on April 20,
Two hours after the tremor tsunami waves as high as 80 cm had been detected. A tsunami warning was later downgraded to a tsunami advisory.
A powerful 7.7 earthquake off Iwate triggers tsunami warnings as waves swell in Tomakomai along northern Japan’s coast. Buildings shook as far as Tokyo, highlighting the quake’s intensity. The JMA warns of a higher-than-normal risk of a magnitude 8+ event.