Vibration Meter description

vibration meter, also known as seismograph,
This app uses the phone sensors to measure vibration or the earthquake, and it shows a reference as a seism detector.
Some countries use Richter scale instead of Mercalli scale. The Richter scale is a base-10 logarithmic scale, which defines magnitude as the logarithm of the ratio of the amplitude of the seismic waves to an arbitrary, minor amplitude.

mercalli intensity scale
présente les caractéristiques suivantes:
1. instrumental - Not felt. Recorded by seismographs.
2. Weak - Rarely felt, usually only on top floors of high buildings.
3. slight - felt indoors, like a passing light truck.
4. moderate - Windows, dishes, doors rattle. Like passing train.
5. Rather Strong - felt by all. Small objects upset.
6. Strong - Books off shelves. Trees shake. Isolated damage.
7. Very Strong - Difficult to stand. Many poor buildings damaged.
8. Destructive - Significant damage. Branches broken from trees.
9. Violent - General panic. Serious damage. Ground cracking.
10. Intense - Most buildings destroyed. Rails bent slightly.
11. Extreme - Rails bent greatly. Pipelines destroyed.
12. catastrophic - Near total damage. Objects thrown into the air.