The researchers used data from the borehole seismometers to calculate the underlying rock's Poisson's ratio. This ratio ...

The researchers used data from the borehole seismometers to calculate the underlying rock's Poisson's ratio. This ratio measures the 3D elastic properties of rocks: think about a sponge, Huang says.

You need to be able to pick up the signals from the geophone and then plot them if you want a seismometer. First, the signals from the geophone must be amplified, which is achieved with a small ...