#earthscience #seismology #physics 

The Modified Mercalli intensity scale is the scale that measures the effects of an [[Earthquake|earthquake]] at a given location.

The current MMIS is modified from Guiseppe Mercalli's intensity scale of 1902, which was itself based on the [[Rossi-Forel scale]]
## Scale

| MMIS scale level | Peak ground acceleration |
| ---------------- | ------------------------ |
| I. Not felt      | <0.0005g                 |
| II. Weak         | 0.003g                   |
| III. Weak        | 0.003g                   |
| IV. Light        | 0.028g                   |
| V. Moderate      | 0.062g                   |
| VI. Strong       | 0.12g                    |
| VII. Very strong | 0.22g                    |
| VIII. Severe     | 0.40g                    |
| IX. Violent      | 0.75g                    |
| X. Extreme       | >1.39g                   |
| XI. Extreme      | >1.39g                   |
| XII. Extreme     | >1.39g                   |
Where peak ground acceleration is the maximum ground [[Ускорение|acceleration]] that occured during earthquake shaking at a location.