本ほん震しん

noun

main shock (of an earthquake)

Seismological term for the largest earthquake in a sequence, contrasted with foreshocks (前震) and aftershocks (余震).

• 本ほん震しんの後あとも、大おおきな余よ震しんが続つづいた。

  Even after the main shock, large aftershocks continued.

• 気き象しょう庁ちょうは、今こん回かいの地じ震しんを本ほん震しんと判はん断だんした。

  The Japan Meteorological Agency determined that this earthquake was the main shock.