That sounds a silly suggestion, but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves.
这听起来似乎是一种愚蠢的想法，但是早期记录地震波的仪器（地震仪）正是采用了这种思路。
Earthquake waves
原声例句
新概念英语.英音版.第四册(译文)
TED-Ed（视频版）
So scientists have had to resort to indirect ways of studying the core, like measuring earthquake waves that pass through it, or studying minerals thought to have formed there.
因此， 科学家们不得不求助于研究地核的间接方法，例如测量穿过地核的地震波，或研究被认为在那里形成的矿物。
中文百科
地震波 Seismic wave
（重定向自Earthquake waves）
地震波（英语：seismic wave），意指在地球内部传递的波动。一般而言，地震波是由构造地震所产生，然而其它自然现象也能生成地震波，例如风。人为的活动也能造成地震波，例如爆炸。对于地球内部构造的了解，地震波扮演了一个不可缺的角色。
英语百科
Seismic wave 地震波
（重定向自Earthquake waves）
![Velocity of seismic waves in the Earth versus depth.[1] The negligible S-wave velocity in the outer core occurs because it is liquid, while in the solid inner core the S-wave velocity is non-zero.](/uploads/202501/10/Speeds_of_seismic_waves3817.PNG)
Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy. Many other natural and anthropogenic sources create low-amplitude waves commonly referred to as ambient vibrations. Seismic waves are studied by geophysicists called seismologists. Seismic wave fields are recorded by a seismometer, hydrophone (in water), or accelerometer.
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