...The most typical ones are as follows. (1) Sonic logging Measures the propagation speed of elastic waves in the earth's formations. In principle, ultrasonic waves of about 20 kHz are emitted from the ultrasonic oscillator of the sonde in the borehole, and the propagation time between two receivers is measured. *Some of the terminology that refers to "sonic logging" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その代表的なものを次にあげる。(1)音波検層 地層中の弾性波伝播(でんぱ)速度を測定する。原理的には,坑井中のゾンデの超音波発振子から20kHz程度の超音波を発射し,2個の受振子間の伝播時間を計る。… ※「音波検層」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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