I describe the development of a simple seismology application. The application, SeisMac, reads accelerometers built into recent Apple Macintosh laptop computers and displays real-time three-axis seismograms. The results are not highly precise, but they are fun to watch and offer educational possibilities. I write as a software engineer interested in seismology for an audience of seismologists interested in software.

In January 2005, Apple introduced the Sudden Motion Sensor™ (SMS) in its high-end laptops. The SMS is a three-axis accelerometer linked with the hard disk, so that if the laptop suddenly finds itself in free fall it can anticipate an impact...

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