Warning of Likely 2nd Jolt to Follow 1st Nankai Trough Quake in Minutes

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Tokyo, Nov. 13 (Jiji Press)--At a meeting Tuesday, a working group under the government's Central Disaster Prevention Council called for warning the public of a possible subsequent strong earthquake within minutes after an earthquake with a magnitude of 7 to 8 happens along the Nankai Trough.

In November 2017, the Japan Meteorological Agency introduced a system to release emergency information about 30 minutes after an earthquake with a magnitude of 7 or more occurs along the trough, which stretches in the Pacific Ocean off central to southwestern Japan, in order to tell the public that it is looking into the possibility of a second massive quake.

However, there is the opinion within the working group that such information should be released more quickly to allow residents in affected areas to get better prepared.

In the Nankai Trough region, if an earthquake with a magnitude of 8 or greater occurs in its eastern or western part, a subsequent powerful temblor is highly likely to happen in the other part, according to experts.

Meanwhile, if a quake with a 7-something magnitude takes place somewhere in the region, it can be a prelude to a jolt with a magnitude of at least 8.

[Copyright The Jiji Press, Ltd.]

Jiji Press