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22 Cards in this Set

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  • Back
Q
What are seismic waves?
A
The waves produced by earthquakes.
Q
What causes seismic waves?
A
When the stress in the rock beneath the Earth's surface builds up enough, the rock breaks or changes shape, releasing energy in the form of waves or vibrations.
Q
What are the 3 types of seismic waves?
A
1. Primary waves
2. Secondary waves
3. Surface waves
Q
What are Primary waves?
A
Longitudinal seismic waves.
Q
What are secondary waves?
A
Transverse seismic waves. They cannot move through liquids.
Q
What are surface seismic waves?
A
Primary and Secondary seismic waves that reach the Earth's surface and combine.
Q
Which seismic waves move the fastest?
A
P waves (Primary waves)are fastest.
Q
Which seismic waves move the slowest?
A
Surface waves are the slowest.
Q
What mediums can a P wave travel through?
A
Solids and liquids
Q
What medium(s) can a S wave travel through?
A
Solids only. This means they cannot be detected on the side of the Earth opposite an earthquake.
Q
What medium(s) can a Surface wave travel through?
A
A seismic surface wave travels on the SURFACE of solids and liquids.
Q
What is the earthquake SHADOW ZONE?
A
The area on the Earth's surface where no seismic waves from a particular earthquake can be detected.
Q
What seismic waves produce the most severe ground movement and damage?
A
Surface waves
Q
What is triangulation?
A
The use of AT LEAST 3 seismographs to locate the center of an earthquake.
Q
For what other purpose do geologists use seismographs?
A
Geologists use seismographs to understand how the what kinds of rocks are deep underground and how they are arraigned.
Q
What property of seismic waves are used to locate the center of earthquakes?
A
The difference in the speed of P waves and S waves.
Q
How do geologists use the difference in seismic wave speed to locate earthquakes?
A
P waves and S waves arrive at seismographs at different times. Knowing this time difference and the speed of seismic wave through rock lets us calculate how far away the earthquake was.
Q
What is a seismograph?
A
An instrument used to detect and measure the strength of earthquakes. It also measures the arrival time of the waves.
Q
Secondary waves (S waves) cannot travel through what part of the Earth's interior?
A
The Earth's LIQUID OUTER CORE.
Q
What type of seismic waves can be detected on the opposite side of the Earth's surface from an earthquake?
A
Only P waves can be detected because S waves cannot thravel through the Earth's liquid core.
Q
What is a tsunami?
A
Surface waves on the ocean caused by an underwater earthquake.
Q
What is the danger from a tsunami?
A
While the swell in open ocean is small (under 3 feet), when the wave reaches shore the energy being carried by the wave causes the waves to pile up,producing waves upto 100+ feet high as they come on shore and travel far inland.