A magnitude 6.2 earthquake struck Hokkaido, Japan, at 5:23 AM JST on Monday, April 27, 2026. No tsunami warning was issued, but officials warned of possible aftershocks amid heightened seismic activity following recent quakes. Japan earthquake hits Hokkaido, raising concerns over further tremors A strong earthquake struck Japan’s northern island of Hokkaido at 5:23 AM JST on Monday, April 27, 2026, according to the Japan Meteorological Agency and the U.S. Geologi