SeisMac
SeisMac turns your Sudden Motion Sensor-equipped laptop into a three-axis seismograph. It shows a scrolling chart of the three axes of acceleration, reading two hundred samples per second. The resizable, real-time scrolling display shows an enormous amount of acceleration information. ... SeisMac is also compatible with older Sudden Motion Sensor-equipped iBooks and PowerBooks. ... SeisMac is free for Mac OS X 10. ... 4 or later. ... It is compatible with MacBooks and MacBook Pros, as well as Sudden Motion Sensor-equipped PowerBooks and iBooks.
http://www.suitable.com/tools/download/SeisMac.dmg - 175Kb - Download - Screenshot