Yesterday there was a small M3.5 earthquake about 15 miles from my home. I have a DIY torsion magnetometer that is constantly running and recording data. The swinging of the free-hanging mirror caused by the earthquake was recorded too (see the snapshot to the right). So, this is now officially a magnetometer/seismograph combo.
You can see near real-time magnetometer data here: http://avtanski.net/projects/magnetometer/data.html
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