stress and energy waves
TRANSCRIPT
Stress and Energy WavesStress and Energy Waves
Movement during an EarthquakeMovement during an Earthquake
October 17, 1989 at 5:04 p.m October 17, 1989 at 5:04 p.m
StressStress
• Stress: Energy stored in the Earth’s crust
• Stress can build up at plate boundaries.
• Potential Energy
FoldingFolding
• Too much stress can cause the rocks to bend or Fold.
• This can form Mountains.
• The Appalachian mountains are folded mountains.
The Appalachian Mountains The Appalachian Mountains (Tennessee) (Tennessee)
FaultingFaulting
• When there is too much stress, the rocks in the crust may break.
• This can cause earthquakes.
Fault LinesFault Lines
Seismic WavesSeismic Waves
• Waves of energy that move through the Earth during an Earthquake.
• There are three types:– Primary waves– Secondary waves– Love-Rayleigh waves
Primary (P) wavesPrimary (P) waves
• Body waves move through the interior of the Earth.
• They are the fastest seismic wave, therefore will always arrive first.
• Move through solid, liquid and gas.
• They are compression waves, they move particles forward and backward.
S wavesS waves
• Also body waves. • Travel more slowly and
arrive second. • Can only move through
solids. • Also called shear waves,
because they move particles side to side.
• AKA transverse waves.
Love-Rayleigh WavesLove-Rayleigh Waves
• Surface waves.• Solid rock only.• Move in a rolling
motion.• Cause ripples on the
surface.
Seismology and Seismic WavesSeismology and Seismic Waves