Science Intensity Scales (V 1.0)
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11 Terms
PEIS (PHIVOLCS Earthquake Intensity Scale)
Measures the perceived strength of an earthquake in 10 intensity scales represented as Roman numerals.
(I) Scarcely Perceptible
Perceptible to people under favorable circumstances.
(II) Slightly Felt
Felt by few individuals at rest indoors.
(III) Weak
Felt by many people indoors especially in upper floors of buildings.
(IV) Moderately Strong
Felt generally by people indoors especially in upper floors of buildings.
(V) Strong
Generally felt by most people indoors and outdoors.
(VI) Very Strong
Many people are frightened; many run outdoors. Some people lose their balance.
(VII) Destructive
Most people are frightened and run outdoors. People find it difficult to stand in upper floors. Limited liquefaction.
(VIII) Very Destructive
Liquefaction and lateral spreading cause man-made structures to sink, tilt, or topple.
(IX) Devastating
People are forcibly thrown to the ground. Many cry and shake with fear.
(X) Completely Devastating
Practically all man-made structures are destroyed. Massive landslides and liquefaction also happen.
