- Slides: 12
Earthquakes and Volcanoes Chapter 8 Section 1, pp. 224 - 229 Chapter 9 Section 3, pp. 260 - 265 Standard: The relationship between movement of the tectonic plates and major geologic events, such earthquakes and volcanoes
Warm Up: Explain the 3 types of faults.
EQ: What causes earthquakes? Seismology Fault Deformation Elastic Rebound Study of earthquakes Break in the Earth’s crust along which blocks of crust slide Change in shape of a rock due to stress Sudden return of a broken, deformed rock Energy released as seismic waves
EQ: What are the 3 kinds of faults? Strike-Slip Fault Reverse Fault Transform motion of boundary 2 Plates slip past each other horizontally Convergent motion of boundary Blocks push together, against each other
Normal Fault NOTE: Divergent motion of boundary Blocks pull away from each other Not all faults are located at plate boundaries Faults can happen along faults in the middle of a plate
EQ: How do earthquake waves travel? Seismic waves P Waves A wave of energy that travels through the Earth away from an earthquake in all directions A seismic wave that causes particles of rock to move in a back and forth motion.
Waves Continued: S Waves Body Waves Surface Waves A seismic wave that causes particles of rock to move in a side to side direction. Travel through Earth’s interior Travel along Earth’s surface
EQ: How are earthquakes measured? Seismograph Seismogram Epicenter Focus Instrument that records seismic waves A tracing of earthquake motion that is created by a seismograph The point on Earth’s surface directly above an earthquake’s starting point The starting point along a fault
Richter Magnitude Scale Measure the strength of an earthquake on a 0 to 10 scale. Measure ground motion or magnitude (strength) For each 1 unit of magnitude , ground motion increases 10 times
Intensity of an Earthquake A measure of the degree to which an earthquake is felt by people and the amount of damage caused.
Summary What do you think is the reason Georgia does not have many earthquakes?
Ticket out the Door: Which wave is most damaging? Explain and support your answer.