MERCALLI SCALE GRADATION OF EARTHQUAKES

I Most people do not notice, animals may be uneasy,
can be detected by a seismograph.
II Hanging objects sway back and forth.
III Many people feel the movement, parked cars may
rock.
IV Doors, windows, and shelves may rattle, people
indoors can feel movement.
V Light furniture moves, pictures fall off walls, objects
fall from shelves.

VI Nearly everyone feels movement, light furniture falls over, windows may crack.
Some people fall over, walls may crack.
Heavy furniture falls over, some walls crumble. Many people panic, some buildings collapse, dams crack.
X Railway lines are bent, most buildings are damaged,
roads crack.
XI Bridges collapse, buried pipes break, most buildings
collapse.
XII All man-made structures are destroyed.

RICHTER SCALE GRADATION OF EARTHQUAKES
Less than 2.0 'Micro' earthquakes; generally not felt, but recorded

2.0-2.9 Potentially perceptible

3.0-3.9 Felt by some

4.0-4.9 Felt by most

5.0-5.9 'Moderate' earthquakes; damaging shocks

6.0-6.9 'Large' earthquakes; destructive in popu­lated regions

7.0-7.9 'Major' earthquakes; inflict serious damages

Greater than 8.0 'Great' earthquakes; cause extensive de­
struction near epicentre