A powerful earthquake struck the coast of northern Japan on Monday, triggering short-term tsunami warnings that have since been lifted. As of 12:29 p.m. local time on April 20, Japan is at a slightly elevated risk of experiencing a megaquake over the next week, according to the Japan Meteorological Agency (JMA) . Monday's earthquake occurred on April 20, 2026 off the coast of Sanriku, Iwate Prefecture at a depth of 10 kilometers (around 6.21 miles), at 4:53 p.m. local time, per the JMA. The earthquake was a magnitude 7.7 on the Richter scale, with an intensity of upper 5 on the Japanese scale of 0 to 7 in the hardest-hit areas. According to the Pacific Tsunami Warning Center 's latest tsunami warning for Japan, “based on all available data... the tsunami threat from this earthquake has now passed.” The advisory was initially issued for Japan's Iwate Prefecture, Hokkaido, Aomori, Miyagi, and Fukushima Prefectures.…