1. EARTHQUAKES

2. A movement or trembling of the ground that is
caused by a sudden release of energy when
rocks move suddenly along a fault line
WHAT ARE EARTHQUAKES:

3.  The location within the Earth along a fault at
which the first motion of an Earthquake
occurs
FOCUS:

4.  The point on the Earth’s surface above the
focus
EPICENTER:

5.  Primary Wave
 Motion is back and forth in the direction of
travel (Compression wave)
 Fastest of the waves and can travel through
all phases of matter
TYPES OF SEISMIC WAVES:
A. P-WAVE

6.  Secondary Wave
 Motion is side to side compared to direction
of travel (Shear Waves)
 Second fastest and can only travel through
solids
TYPES OF SEISMIC WAVES:
B. S-WAVE:

7. A seismic wave that travels along the surface
and has a stronger effect; converted P and S
wave, causes the most damage
TYPES OF SEISMIC WAVES:
C. SURFACE WAVES:

8. Various densities and
phases are shown by wave
deflection
 S waves blocked by liquid
outer core
HOW DID WAVES LEAD TO OUR
KNOWLEDGE OF EARTH’S INTERIOR?

9.  The longer the time difference between the
arrival of the P and S waves, the farther from
the epicenter
HOW DO YOU DETERMINE THE LOCATION
OF AN EARTHQUAKE?

10.  Use the distance from three seismic stations
as radii for three circles to determine
epicenter location
HOW DO YOU DETERMINE THE LOCATION
OF AN EARTHQUAKE?