3 ways of measuring earthquakes Mercalli scale Richter scale moment magnitude scale rates earthquakes according to level of damage rated using seismographs estimates total energy released by earthquake rates earthquakes of all sizes (near & far) good for small, nearby earthquakes describes how earthquakes affect people, bldg. & land
The Mercalli scale was developed to rate earthquakes according to the amount of damage at a given place.
Mercalli Scale Earthquake Intensity Earthquake Effects I-III People notice vibrations like those from a passing truck. Unstable objects disturbed. IV-VI Dishes and windows rattle. Books knocked off shelves. Slight damage. People run outdoors. VII-IX Moderate to heavy damage. Buildings jolted off foundations or destroyed. X-XII Great destruction. Cracks appear in ground and landslides occur. Waves seen on ground surface.