| Basic facts | Why Earthquakes happen | Seismic Waves | Scales |
|---|---|---|---|
|
Constant movement of the earth's plates.
This causes earthquakes
|
True
The first motion of an earthquake occurs at the focus.
|
P-waves
What is the fastest moving waves
|
Small earthquake
A foreshock
|
|
The elastic rebound theory
This releases of stress during an earthquake
|
Earthquake
Vibrations in Earth that are caused by the sudden movement of rock
|
True
S-waves travel through solids only
|
true
The moment magnitude scale is used to measure a large earthquake.
|
|
What is a slip
The amount of ground displacement in a earthquake is called the _________ .
|
Magnitude
a measure of the strength of an earthquake
|
P-waves
Type of seismic waves can travel through solids, liquids and gases
|
seismograph
An instrument that detects and measures earthquakes
|
|
What is yes
The ground always shakes during a earthquake
|
What is To an open area, free of buildings and obstacles. In the second stage, emergency services will be setup in the affected area, together with structures for receiving evacuees to assist in organizing and transporting evacuees to these structures. People will find shelter, clothing and food in these structures and also information centers and points of communication. People that remain there will be assisted and trained and receive every necessary assistance.
In case of evacuation announcement
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Shadow zone
The area where no direct seismic waves from a particular earthquake can be detected
|
Indian Ocean English Canal The Ring of Fire Mid-Atlantic Ridge
This area is responsible for 90% of all earthquakes in the world and contains numerous faults:
|
|
What is yes
The first earthquake usually the most powerful
|
Epicenter
The location on the surface directly above the earthquake focus
|
The speed and direction of seismic waves
The composition of Earth's interior effects
|
Mercalli scale
This scale is used to measure the intensity of an earthquake
|
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