This is the best tl;dr I could make, original reduced by 91%. (I'm a bot)

MIT researchers have now developed a technique to "See" vibrations that would otherwise be invisible to the naked eye, combining high-speed video with computer vision techniques.

The vibrations measured by the technique matched those picked up by accelerometers and laser vibrometry - precise but expensive techniques commonly used in infrastructure monitoring.

As an alternative, laser vibrometry is a noncontact technique that exposes a structure to a laser beam and an acoustic wave, the velocities of which can be translated to calculate a structure's displacement, or motion.

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