They are designed to pick up the echo of the seismic vibrations created by contraptions called "thumper trucks" pounding the ground.

一个名叫“桑普卡车”的小装置会敲击地面，引起的细微地面震动又再传输到无线传感器上。

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Here we used Wavelet and spectral analysis to different kind seismic waves in volcanic area, in order to pick up their spectral character and determine the type of these earthquakes.

本文对火山区不同种类的地震波形运用小波分析和频谱分析的方法，希望能提取不同类型火山地震的一些频谱特征，确定火山地震的类型。

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An electronic receiver designed to pick up seismic vibrations.

因地震的震动力而摇动。

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