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100
What is a crack in a rock?
Fault
100
How do seismic waves move?
Ripple outward from the focus
100
How to P waves make rock move?
Back and forth, parallel to the direction of the wave
100
What are areas on Earth’s surface where waves from an earthquake can’t be detected?
Shadow zones
100
What is a machine that senses vibrations caused by seismic waves?
Seismograph
200
What is the point where the first motion of an earthquake occurs?
Focus
200
What are the two main types of seismic waves?
Body and Surface waves
200
How do S waves make rock move?
Side to side, perpendicular to the direction of the wave
200
What is an area that contains a lot of faults that are close together?
Fault zone
200
What is an earthquake’s magnitude?
It’s strength
300
What is the point on Earth’s surface directly above the focus of an earthquake?
Epicenter
300
Where do body waves travel?
Through rock
300
What are the two types of surface waves?
Love and Rayleigh waves
300
What is the study of earthquakes and seismic waves?
Seismology
300
What is an earthquake’s intensity?
The amount of damage it causes
400
How do scientists group earthquakes?
Based on how deep their foci are
400
Where to surface waves travel?
Along the surface of the Earth
400
Why do scientists study seismic waves?
To learn more about Earth’s structure
400
What are scientists who study seismology called?
Seismologists
400
Which magnitude scale is more used by scientists today?
Momentum magnitude scale
500
What are vibrations caused by the energy released in an earthquake?
Seismic waves
500
What are the two types of body waves?
P and S waves
500
What produces shadow zones?
The bending of waves
500
What is the most important machine used by seismologists?
Seismograph
500
What is the order that a seismograph records Surface, S, and P waves?
P waves first S waves second Surface waves third