| It is calculated either from the signal recorded by a seismometer, either from the period of this signal. |
| But what neither that first seismometer nor any produced since can do is predict quakes. |
| Each station uses a digital, threecomponent, broad-band seismometer, an instrument that measures and amplifies ground motion. |
| Links here are to various sources with information on how to build a seismometer. |
| At the local warning center a seismometer will provide accurate recordings of volcanic activity. |
| To the left is the video camera and radio antenna, and dimly visible at far left is a dark box which contains the seismometer. |
