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Arduino Projects to Save the World by Emery Premeaux

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C H A P T E R  6

The Mass Effect

Measuring Earthquakes with a Digital Seismometer

March 11, 2011 is a day I will never forget. I had just arrived home to my Tokyo apartment and was searching the house for some documents I needed for an urgent errand. As I leafed through stacks of papers on my desk, I began feeling the all-too-common motion of an earthquake. Having lived in Tokyo for five years, the sensation had become commonplace in my mind, and I continued looking around. At first, I assumed it was just like all the other minor quakes I had experienced in the past.

After a few moments, the motion did not subside. Instead, it began to sort of swirl. The ground was not shaking in just one direction. It felt like I was bobbing in the ocean rather ...

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