PLOTTING EARTHQUAKE LAB
earthquakes donít shake the Earth the same. People can feel different
shaking intensities at different locations. Some earthquakes shake
everything (high intensity), and others are not felt at all (low
intensity). It is important to compare these earthquakes so we can
determine how to prevent damage.
Before seismographs were invented different
methods of recording an earthquake were used. In Italy, Giuseppe
Mercalli created a 12 point scale in 1902 which was based on stories of
damage from people.
Today, the Modified Mercalli Scale represents the
local effect or damage caused by an earthquake. The
"intensity" reported at different points generally decreases
away from the earthquake epicenter. The intensity ranges, from I -XII,
is always expressed in Roman numerals. For example, an earthquake of
intensity "II" would be barely felt by people, while heavy
damage would be assigned a "X."