Seismograph: Vibration Log
By Kyu-Hee Jang on AppTrack Ninja.
Shake Meter · MMI · Waveform
Turn your iPhone into a vibration recorder: live 3-axis waveform, automatic capture of shaking events, and a log you can replay and export. HOW IT MEASURES Shaking is read from the accelerometer and reported as peak ground acceleration, then mapped to the Modified Mercalli Intensity scale (MMI I-XII) using the USGS ShakeMap relationship. MMI is the primary scale because it is the one a phone can honestly produce — it describes how strongly a place shook. A magnitude-style number is shown alongside as a rough estimate; it is not a Richter measurement, which needs a calibrated instrument and th…
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