The PHIVOLCS earthquake intensity scale (PEIS; ) is a seismic scale used and developed by the

Philippine Institute of Volcanology and Seismology The Philippine Institute of Volcanology and Seismology (PHIVOLCS, ; ) is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and tsunamis, as well as other specialized information and ...

(PHIVOLCS) to measure the

intensity Intensity may refer to: In colloquial use * Strength (disambiguation) *Amplitude * Level (disambiguation) * Magnitude (disambiguation) In physical sciences Physics *Intensity (physics), power per unit area (W/m2) *Field strength of electric, m ...

earthquakes An earthquakealso called a quake, tremor, or tembloris the shaking of the Earth's surface resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes can range in intensity, from those so weak they c ...

. It was developed as upon a specific response to the

1990 Luzon earthquake The 1990 Luzon earthquake occurred on July 16 at 4:26 p.m. (Daylight saving time in the Philippines, PDT) or 3:26 p.m. (Philippine Standard Time, PST) on the densely populated island of Luzon in the Philippines. The shock had a surfac ...

. PHIVOLCS cites seismic scale specifically developed for the Philippine setting, the different geography of each country and other "geological considerations" led to the development of PEIS. The scale measures the effect of an earthquake on a given area based on its relative effect to people, structures and objects in the surroundings. The PEIS was adopted in the Philippines in 1996 replacing the Rossi-Forel scale.

Scales

The PEIS has ten intensity scales represented in Roman numerals with Intensity I being the weakest and Intensity X being the strongest.

References

;Public domain sources * *

External links

PHIVOLCS Earthquake Intensity Scale
at the Philippine Institute of Volcanology and Seismology {{Seismic scales Seismic intensity scales 1996 introductions Geology of the Philippines Department of Science and Technology (Philippines)