The frequencies used in sonar systems vary from infrasonic to ultrasonic.

声纳所使用的频率从次声到超声不等。

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In the first part, an infrasonic pressure chamber system was established.

第一部分为次声压力仓系统的建立及性能检测。

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Infrasonic observations of open ocean swells in the Pacific: Deciphering the song of the sea.

在太平洋里大洋涌(长浪)次声观测：译解海地歌曲。

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Buoyed by their success, however, scientists on the mission are checking through the satellite's data to see if an infrasonic signal was also recorded when an asteroid entered the atmosphere over the Russian city of Chelyabinsk last month.

BBC: Japan quake 'heard at edge of space'