primary wave

Japanese: primary wave(英語表記)primarywave
primary wave

…P waves are longitudinal waves that vibrate in the direction of their propagation and transmit expansion and contraction (volume change). They are called P waves because they are the first waves recorded by seismographs. The exact location of the epicenter requires the arrival time of the P waves at each observatory. …

*Some of the terminology that refers to "primary wave" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…P波は縦波で,波の伝わる方向に振動し,伸び縮み(体積変化)を伝える。最初の波(primary wave)として地震計に記録されるためP波と呼ばれる。正確な震源位置の決定には各観測所におけるP波の到達時刻が必要である。…

※「primary wave」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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