Science-8 (Earthquake, magnitude, intensity)

• The Richter scale is used to measure the strength or size of an earthquake.
• Richter Scale measures the amplitude of seismic waves generated by an earthquake.
• When an Earthquake happens, the main quantity of interest is its magnitude.
• There are two ways on how to describe the strength of an Earthquake: intensity and magnitude.
• The magnitude describes the energy released as the rocks bend and suddenly snap along the faults.
• The greater the magnitude, the stronger the Earthquake is.
• The Richter Magnitude Scale which is expressed in Hindu- Arabic numerals ( eg. 2, 3, 4) are numerical values to describe the energy released.
• Intensity describes the observing effects of an Earthquake to people, objects, environment and structure in a certain locality.
• Roman numerals ( eg. I, II, III) are used to expressed the intensity scale.
• The PHIVOLCS Earthquake Intensity Scale (PEIS) is used in the Philippines.