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Science
Environmental Science
Earthquakes: Magnitude and Intensity
Magnitude
magnitude: a measure of energy released by an earthquake
quantitative
as magnitude increases, the earthquake tends to:
affect a broader region
shake for longer (damage more buildings, cause more harm)
Richter Magnitude Scale
measures amplitude
amplitude: size of the waves on seismograph
logarithmic scale: each degree of magnitude is 10x bigger waves
equates to 50x more energy per degree of magnitude
not accurate for large, deep, or distant earthquakes
no longer used
Moment Magnitude Scale
the scale that’s now used
measures strain energy along rupture surface (energy released)
logarithmic scale: each degree of magnitude is 10x more energy released
more accurate than richter
most widely accepted and used by scientists
Intensity
qualitative
what we feel in an earthquake
modified mercalli scale
“I'“ is felt by very few people or not at all to “X” which is total destruction
Earthquake Intensity
relates to ground motion’s effects on population and structures
rely on “felt” reports
people provide location and their own intensity rating
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