Seismology (Grade 9)
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Scientists use data from seismic waves to learn about the structure of Earth's interior.
Earthquakes usually occur along the edges of tectonic plates, but it is possible for them to occur almost anywhere on any size or type of fault.
The focus of an earthquake is directly above the epicenter.
Earthquake early warning systems give residents time to evacuate before an earthquake strikes.
Surface waves are especially dangerous to buildings.
Some sections of the San Andreas fault are moving slowly and continuously, and therefore have a low probability of producing a large damaging earthquake.
As an S wave travels through rock, the rock particles move perpendicular to the direction in which the wave is traveling.
On a seismograms, seismic waves recorded from more distant facilities are closer together than those recorded from facilities close to the epicenter.
L waves are the fastest surface waves.
The transition zone separates the from the .
- Upper Mantle (from the ) Lower mantle
- Faster P (from the) slower s
- Slowest R ( from the) faster L
- None of the above
As P and S waves travel through denser material their velocities
- Stay constant
A place on a fault that can be the site of a future earthquake is called
- Seismic gap
- Lithospheric plates
- Subduction zone
S waves are faster than
- L waves
- R waves
- Both L and R
- Neither L or R
waves cause particles of material to move in elliptical patterns.
- R waves
- S waves
- P waves
- L waves
An earthquake focus is also known as a .
How many seismograph stations does it take to calculate an epicenter?
P and S are examples of
- surface waves
- body waves
- rayleigh waves
- parallel waves
What is earthquake intensity?
- a measure of energy released
- a measure of seismic risk
- a measure of damage
- a measure of an earthquake's focus
Which of the following factors does NOT affect the amount of damage done by an earthquake?
- the population living near the earthquake
- the types of structures
- the length and intensity of the quake
- the number of trees and plant growth in the area
A earthquake is a movement of the ground that occurs when rocks inside Earth pass their limit, break and rebound.