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Amber Walsh

on 7 January 2016

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Transcript of Earthquakes

Earthquakes happen near the boundaries of tectonic plates.

Fault at Tectonic Plate Boundaries
Cause: Earthquake at Divergent boundaries (the tectonic plates separate)

Effect: Fault blocks form

Fault of Tectonic Plate Boundaries
Cause: Earthquake at covergent boundaries (two tectonic plates collide with one another)

Effect: Mountains form or one plate can move underneath the other plate and sink into the mantle

Why Earthquakes Happen
Elastic rebounds
cause earthquakes due to the built up stress on the rocks along the fault. This causes the rocks to break or fail. The rocks then jerk past each other causing seismic waves to be released. These seismic waves cause Earthquakes.


Understand that sudden motions along breaks in Earth's crust can release energy in the form of seismic waves.
Tectonic Plate Boundaries
Part one:
Review-What Are earthquakes
Cause: Earthquake at transform boundaries (two plates move past one another horizontally)

Effect: forms strike-strip faults
Earthquake Waves
P Waves
Pressure Waves
First to be detected in earthquake
Move through solids, liquids, and gases
Squeeze and stretch rock
Earthquakes are physical results of the movement of energy through Earth as seismic waves
S Waves
Shear Waves (S Waves)
Shear rock side to side
Cannot travel through parts of Earth that are completely liquid
Slower than P waves
Also known as secondary waves
Surface Waves
Move only along Earth's surface
produce motion near top of Earth's crust
cause the most damage usually
travel more slowly than P and S waves
produces a rolling, up-and-down motion
produces a back-and-forth motion like S waves
Full transcript