Download Seismic Waves

Seismic Waves
By Genevieve
Scientist study earthquakes to know
more about the earth. To study
earthquakes scientist use
seismographs. Seismographs
measures the the movement and
vibration of earthquakes. It also tells
what kind of seismic wave it is.
Seismic waves are vibrations caused
by rocks moving or breaking along
faults. Seismographs make
seismograms. On the seismogram
the first small lines are p waves.
Fault
This is a seismogram
You can see how the p waves are the smallest on the
seismogram
Primary waves are also
known as p waves. Primary
waves are the first to arrive
at a distance point. These
waves are the fastest. They
travel through solids liquids
and gases.
Secondary Waves are also
known as S waves. These
waves travel through solids
only. S waves are slower
then primary waves.
Secondary waves arrive at a
distance point.
Surface waves are also
known as L waves or long
waves. These waves are the
slowest waves of all, but
they cause the most
damage. Surface waves are
felt at the surface.
There are four layers of the
Earth. They are the crust,
mantle, outer core and inner
core.
We live on the crust! It is
Earth's outer most layer. The
crust is the thinnest layer. It
is solid rock. It is deeper
under continents than
oceans.
The mantle is a layer of
crust that lies below the
crust. The thickest layer is
the mantle. This layer allows
tectonic plates to slowly
move. Rocks move or flow
due to pressure and high
temperatures.
The outer core is made of
melted iron, so it is totally
liquid. The inner core flows
in this layer.
The inner core is a solid
sphere. It is in the center of
the earth. This layer spins at
a different rate than the rest
of the Earth.
THE END
Hope you learned a LOT!!!