Society | Apr 03

Japan ends use of term 'aftershock' 10 years after Great East Japan Earthquake

The Meteorological Agency has stopped using the term “aftershocks” for strong earthquakes occurring in areas around the focus of the Great East Japan Earthquake in March 2011, which devastated Japan’s northeast.

When tremors measuring lower 5, the fifth-highest level on the country’s shindo seismic intensity scale, or higher occurred in areas designated as the 2011 earthquake’s aftershock zone, the agency had noted the possibility that they were aftershocks of the 2011 quake, which had measured up to 7, the highest level on the shindo scale.

The decision to avoid describing such quakes as aftershocks came as it became more difficult to make clear judgments on the matter, with 10 years having passed since the massive jolt, and also because earthquakes with a magnitude of 7 to 8 have repeatedly been occurring along the Japan Trench off the coast of eastern Japan.

But the agency will continue to disclose data on earthquakes occurring in the aftershock zone because the impact of the 9.0-magnitude quake has lasted over 10 years.


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