Seismic Waves and Earth’s Interior
Eric Angat
Environmental Science
Figure 19-11,
page 504
Observations of
seismic wave
velocities have
enabled
scientists to
subdivide Earth’s
interior into
various layers.
There are different
types of seismic
waves based on the
movement . The two
major types are body
waves ( S and P
waves ) and surface
waves. Body waves
can travel through
earth inner layers
while surface waves
can travel only on the
surface of the land.
Seismic Waves
are produced by Earthquakes
Body Waves
Surface Waves
Slowest
P-Wave
S-Wave
Fastest
Fast
Can travel
through
Earth
Can travel
through Earth,
but not
through the
core.
Travels only on Earth’s
surface
What kind of movement is
produced by each of the three
types of seismic waves?
P waves - compress and expand the
ground like a accordion
S waves - vibrate from side to side as
well as up and down
Surface waves - make the ground roll like
ocean waves
Figure 1010, page 503
Refraction or
bending of
waves
provide
scientists
information
on the
composition
and interior
of Earth.
How are we affected by Earthquakes?
What are earthquake waves?
How fast are seismic waves?
How are the layers of Earth different from one another?