Transcript Earthquakes

Earthquakes
An earthquake is the shaking or trembling of the
earth caused by the _Sudden_ movement of the
earth’s crust.
They usually occur where rocks that have been
fractured suddenly _Shift___.
Most earthquakes occur along
_Plate Boundaries_______
Elastic Rebound Theory
Lithospheric rocks are “locked” which causes
great _Stress___.
This causes the rocks to _Fracture__ and the
two sides of the rock “spring out and back”
_Slippage__ causes a release in energy in the
form of vibrations called:
_Seismic Waves__.
When seismic waves cause other rocks to
move (or the same rocks move again) it is
called:
AN AFTERSHOCK
The place along a fault where the rock
moves is called the:
THE FOCUS
The earthquake is usually felt
the strongest on the surface
above the focus called the
__Epicenter__
The process of using different
locations to help pin point the
epicenter is called
Triangulation
3 different earthquake depths
1. Shallow focus: within 70 km of earth’s
surface.
2. Intermediate focus: between 70km – 300km
3. Deep Focus: Occurs in subduction zones
between 300-650km.
Which depth causes the most damage?
Why?