The Japanese government implements a new alert system in seven coastal prefectures from Chiba to Hokkaido to warn against subsequent earthquakes should a quake of magnitude 7.0 or larger strikes in either of two deep-sea trenches in the Pacific Ocean where massive temblors are feared.
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The central government decided on Nov. 8 that in the event of a huge earthquake along the Japan Trench or the Chishima Trench, it will issue an alert warning of the potential for follow-up earthquakes.