Forces in Earth's Crust
Faults
Seismic Waves
Earthquake & Damage
Earthquake Safety
100
This type of stress causes two rocks to slip past one another.
What is shearing?
100
Where do faults normally occur?
Along plate boundaries.
100
A seismograph does this.
What is measures and records seismic waves?
100
What is the name for the shaking and trembling that results from the movement of rock beneath the Earth's surface?
What is an earthquake?
100
These are the three things you should do to stay safe during an earthquake.
What are drop, cover and hold?
200
This stress force pulls on the crust, stretching rock so it becomes thin in the middle.
What is tension?
200
What kind of fault does compression cause?
What is a reverse fault?
200
What do seismic waves do?
Carry energy from an earthquake.
200
This is the area underground where the seismic waves of an earthquake originate.
What is the focus?
200
Where are the places that earthquakes are least likely to happen?
What is far away from plate boundaries?
300
This force squeezes rock together until it breaks.
What is compression?
300
What kind of fault does tension cause?
What are normal faults?
300
What is an earthquake's magnitude?
The number assigned to an earthquake based on the earthquake's size.
300
The point on the surface of the Earth (the ground) right above where the earthquake originated underground.
What is the epicenter?
300
These three states of the US have the highest earthquake risk.
What are California, Alaska and Hawaii?
400
What is a force that acts on rock to change its shape or volume?
What is stress?
400
What kind of fault does shearing cause?
What is a strike-slip fault?
400
How do geologists determine the magnitude number of an earthquake?
By measuring the seismic waves and fault movement that occur during an earthquake.
400
What is the name of the fault line that runs up and down the state of California?
What is the San Andreas fault?
400
This is what you should do immediately after an earthquake.
What is stay put because there could be aftershocks?
500
These are the three types of stress?
What are shearing, compression and tension?
500
How do geologists determine what places are at risk for earthquake damage?
By knowing where faults exist and are active.
500
Name the 3 methods of measuring an earthquake.
What is the Mercalli scale, the Richter scale, and the moment magnitude scale.
500
This is caused by displaced water when the sea-floor shifts during an earthquake.
What is a tsunami?
500
What are four causes of earthquake damage?
What are shaking, liquifaction, tsunamis and aftershocks?
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