An earthquake of level 4 on the Shindo scale has struck north-eastern Japan. Authorities have issued a tsunami warning, but the threat has passed.
A powerful quake of 6.9 Richter rattled northern Japan Sunday evening, followed by several more temblors, according to the Japan Meteorological Agency (JMA).
At first, a tsunami advisory was issued, but it was later called off. Some waves measuring 2... [1552 chars]