Transcript Ch. 12 Earthquakes

Ch. 12 Earthquakes
By: Mason Maloy
Seismographs and Waves
• Seismographs detects vibrations in the Earth’s
crust.
• Body waves- waves that travel under the
surface of the Earth.
– P. Wave- Back and forth/compressing motion and
are the fastest (P.= Primary Wave)
– S. Wave- Side to side and only move through
solids (S.= Secondary Wave)
Locating Epicenters
1. Find lag time between P. and S. wave to find
the distance from the seismograph station
2. Create a circle that matches that distance
from the station
3. Do this for two more stations
4. Where all three circles meet is the epicenter
Elastic Rebound Theory
• Scientist believe earthquakes are cause by
Elastic Rebound
• Elastic Rebound- The sudden return of
elastically deformed rock to its undeformed
shape
Tsunamis
• Tsunami- A giant ocean wave that forms after
a volcanic eruption, submarine earthquake, or
landslide.
• The rise or fall of the ocean floor causes a rise
of fall of the ocean water, creating an
extremely large mass of water, that forms the
wave