Earthquakes

The table below shows a modified Mercalli scale. Notice how the intensity of an earthquake corresponds to its effects.

Intensity	Effects
1	Slight shocks are felt by experienced observers.
2	Extremely feeble shocks are felt by few persons at rest.
3	Very feeble shocks are felt by several persons at rest.
4	Feeble shocks are felt by people both indoors and outdoors; movable objects swing; doors and windows are moved out.
5	Shocks of moderate intensity are felt generally by everyone; pieces of furniture are moved out of place; some bells may ring.
6	Fairly strong shocks can awaken those asleep; hanging objects move in circle; trees and shrubs sway; unstable objects may overturn.
7	Strong shocks are felt; movable objects fall; parked vehicles move.
8	Very strong shocks are felt; heavy pieces of furniture move and topple down; the walls of buildings crack; weak houses are damaged.
9	Extremely strong shocks are felt; destruction of some buildings occurs; landslides are observed; electric posts and monuments tilt.
10	Shocks of extreme intensity are felt; a great disaster occurs as the rock layers are ruined; rocks fall from mountains; railroad tracks bend.