Download Seismic Waves

INSIDE EARTH
By Brooke E.
Introduction
Earthquakes are movements or
vibrations in the Earth. They are
caused the release of stored energy
in earth's outer layer. There is also
an instrument that detects,
measures, and records the energy
of an earthquake.This is called a
seismograph, and it produces
seismograms. Pressure within the
earth can cause rocks in its outer
layer to break. These breaks are
called faults. When an earthquake
begins, pressure deep within Earth
causes rocks along faults to move
and break. As they move, energy is
released as vibrations. These
vibrations are called seismic waves.
As seismic waves move through
Earth and along its surface, they are
felt as shakings and vibrations.
Primary Waves
Called P waves
Fastest waves
First to arrive at a distant
point
Travels through solids,
liquids, and gases
Secondary
Waves
Called S waves
Slower that P waves
Arrives later at a distant
point
Travels through solids only
Surface Waves
Called L waves
Slowest waves of all
Felt at the surface
Causes the most damage
Introducing...
The layers of the Earth!
Crust
Thinnest layer
Grass, dirt, and sand
Contains oxygen
Deeper under continents than
oceans
Earth's most outer layer
We live on it
Solid rock
The thin yellow
layer is the crust
Mantle
Thickest layer
Layer of rock lying below the
crust
Allows tectonic plates to
slowly move
Rocks move or flow due to
pressure and high
temperatures
Outer core
Made of melted iron
Totally liquid
Inner core floats in this layer
Inner core
Solid sphere
Center of the earth
Spins at a different rate than
the rest of the planet
Earthquake
Fault
Tectonic plates
Richter scale
Seismograph/
Seismogram
The yellow
section
Crust
The red
layer
Mantle
Outer core
The yellow layer is the...
Inner core
The layer that is the center of the earth