> Straight from the San Francisco Bay Area, EarthQuake is a Control
> Panel that shakes your mac's desktop and windows while it plays an
> earthquake sound. You can turn EarthQuake on and off from the
> keyboard at any moment using a quick key combination of your choice.
>  The control panel lets you set the delay between earthquakes and
> the quick on/off key combination.
>  The duration of the earthquake is random.

Compatibility
Architecture: 68k

EarthQuake requires System 7 or above and it will work properly on the
Macintosh SE/30�, Macintosh II� family and above.
To install it, move EarthQuake to your System folder, choose to put it
into the Control Panels folder and restart.