Download Earthquake Locations/Terminology Elastic Rebound Theory Seismic

Earthquake Locations/Terminology
Elastic Rebound Theory
Seismic Waves
Measuring Earthquakes
I. Seismology: Study of Earthquakes
 Faults: Breaks in
Earth’s crust
 Near or at the edges
of tectonic plates
 Deformation: A change in the shape
of rock due to stress.
 Elastic Rebound: Return of deformed
rock to its original shape.
Seismic Waves
 P-Waves: Fastest waves, pull & pull, travel through
solid liquids, gases
 S-Waves: Second fastest, side to side, travel through
solids
 Surface Waves: Slowest waves, very destructive, role
on surface
 Richter Scale: Shows magnitude
(energy). A calculation based on
amount of movement recorded on
seismograph.
 Modified Mercalli Scale: Quantifies
intensity or damage of Earthquakes.
 S waves show mantle core
boundary. Why?
 Shadow zone shows thickness of
outer mantle.
VI. Seismometer: Instrument that records
seismographs (All three seismic waves)
S& P Wave Travel Time vs Distance
 Record S and P waves at 3 cities
 Subtract P time from S time for each
city.
 Use S & P Travel Time vs Distance
Graph to find Distance to Epicenter
for each earthquake
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