Japan Meteorological Agency admits error in issuing quake warning
Jiji -- Jan 06
The Japan Meteorological Agency said Friday that there was a miscalculation behind its emergency warning on the day of a strong earthquake off the coast of Ibaraki Prefecture, which was followed by no major quake.

A quake measuring up to 3 on the Japanese seismic intensity scale of 7 occurred off the eastern Japan prefecture at 11:02 a.m. (2:02 a.m. GMT), while another quake also registering up to 3 took place in the central prefecture of Toyama around the same time, according to the agency.

But the agency's system to issue emergency quake warnings recognized the two quakes as a single temblor, leading to the emergency warning.

The early warning affected public transportation in the Tokyo metropolitan area. Tokyo Metro Co. suspended train operations for three minutes.

The agency issues such alerts when it predicts an earthquake of lower 5 or stronger on the Japanese scale. The alerts are based chiefly on seismometer data and are issued in order to minimize damage.

5日午前11時2分ごろ、茨城県神栖市で震度3を観測する地震がありました。この地震の震源は茨城県沖で、震源の深さは40キロ、地震の規模を示すマグニチュードは4.4と推定されます。この地震に関連して、気象庁は茨城県南部で最大震度5強を予測する緊急地震速報を出しました。
News sources: Jiji, ANNnewsCH
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