Seismographs and Ambient Tremors

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:

  1. A detector to pick up motion.
  2. 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.

This link will help explain it.

Seismographs do pick up events like SUV crashes and wind storms in forested areas.