Definitions
Earthquakes 1
Earthquakes 2
Waves
100
What is the definition of amplitude?
Half the distance from a crest (the top wave) to a trough (the bottom of the wave) The stronger the earthquake the higher the amplitude.
100
What is the instrument used to study earthquakes?
Seismograph
100
What is an aftershock?
Small tremors that follow an earthquake.
100
Which is bigger: The P-wave or the S-wave?
The P wave is bigger.
200
What is a wavelength?
The distance from one crest (or trough) to the next.
200
What type of faulting is illustrated in this picture?
Normal Faulting
200
How long can aftershocks last?
Aftershocks can last hours, days, or even years.
200
What are the two main types of waves?
Transverse waves
Longitudinal Waves
300
What is a medium?
The substance that carries a vibration (or disturbances).
300
The Pacific Ring of Fire is an earthquake zone that forms a ring around where?
Pacific Ocean
300
When earthquakes occur underwater what can they cause?
Tsunamis, intense ground shaking, and landslides.
300
What is the minimum number of seismograph stations a scientist must have data from in order to locate the epicenter of an earthquake?
Three
400
What is frequency?
a measure of the number of waves that pass a fixed point per second.
400
In what plate boundaries are earthquakes most likely to occur?
Convergent plate boundaries.
400
What happens when the earths plates move?
Earthquakes
400
What changes the amplitude of the waves of an earthquake?
How strong the ground vibrations are.
500
What is the definition of an earthquake?
A form of stick-slip motion as a transform boundary. The movement of the Earths crust resulting from the release of built up energy between two stuck plates. Most likely to happen at a convergent boundary.
500
In what motion to P-waves move? How do S-waves move?
P- waves move forward and backward
S-Waves travel with up and down motion
500
How do Scientists determine how far away from a seismograph station an earthquake occurred?
They plot the arrival times between P and S waves.
500
What causes the up and down wiggles on a seismogram?
Seismic waves, Ground Vibrations, Earthquakes.