It has been developed for the improvement of the digital seismic station, and is an alternate production of the model JD-2 deep well seismometer.
它是为井下地震台的数字化改造而研制的，是JD - 2型地震仪的替代产品。
The model JD-2F bore-hole seismometer has been successfully developed on the basis of the model JD-2 deep well seismometer after improving technology and introducing electronic feedback technology.
JD - 2f型井下地震计是在JD - 2型深井地震仪的基础上，经过进一步的技术改进并引入电子反馈技术而研制成功的。
A seismometer is a seismograph whose physical constants are so well known.
地震计是一种地震仪器，其物理常数是已知的。
Well here we're looking at the vertical component from the seismometer, and this is just the background motion.
我们在看测震表上的竖直部分，这只是背景移动。
Well here we're looking at the vertical component from the seismometer, and this is just the background motion.
我们在看测震表上的竖直部分，这只是背景移动。
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