How do seismographs prevent false readings from day-to-day, non-earthquake tremors (such as someone walking into the room, a truck driving by outside, etc.)?
In simple terms a seismograph is composed of two parts:
- A detector to pick up motion.
- A recorder.
The two are never near each other, except in some museum exhibits where kids can jump on a pad and see the results on the rotating drum behind the window.