Ｐ波ぴーは

noun

P-wave; primary wave

Seismological term for the compressional wave that arrives first during an earthquake.

• 地じ震しんのとき、最さい初しょに感かんじる小ちいさな揺ゆれはＰ波はによるものです。

  During an earthquake, the small shaking you feel first is caused by P-waves.