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Terms in this set (30)
Four states in which potential for major earthquakes occur.
Two possible methods to reduce the chance of earthquakes
What happens to the P and S waves traveling through local rock before an earthquake occurs?
They slow down
What is the name of the process by which rock is broken and moves?
Which seismic wave is not used in finding an earthquake's location?
What does the "Modified Mercalli" scale measures?
intensity of an earthquake
What is the point at which an earthquake actually occurs in the earth called?
Earthquakes with deep focuses would most likely be found near what tectonic feature?
What does the richter scale measure?
In which part of Illinois have most of the earthquakes that have occurred in recent years taken place?
What created the New Madrid, MO fault zone?
failed rift system
What is the plate boundary for Southern California?
What is the plate boundary for India?
continental- continental convergent
What is the plate boundary for Japan?
oceanic- oceanic convergent
A crack in the crustal rock along which movement takes place is known as:
The point on the earth's surface above an earthquake's origin is called:
After an earthquake, when the rocks try to shift back to their original position, they create:
A wire or laser beam stretched across a fault to record horizontal movement is called:
How many times faster do P waves travel compared to S waves?
When do Tsunamis become most dangerous?
when it encounters land
An instrument used to measure changes in the slope of ground is called:
The sudden movement of the land surface along a fracture is called:
Rocks bend or deform until they finally break and return to their original position. This is known as the:
elastic rebound theory
When an earthquake hits San Francisco, it is very destructive. This is because of the wet and loose ground undergoes a change called:
Which waves are the most destructive of the earthquake waves?
Would more earthquake damage occur to a city or bedrock or a city on sand?
city on sand
The location of earthquake zones tend to be very similar to what?
Strange events that sometimes occur before an earthquake are called:
Three precursors that may be observed before an earthquake strikes
radon gas- gas leaks from the earth
foreshocks-small quakes that occur before the main
animal behavior-animals act different
Why must there be a minimum of three seismograph stations to determine the epicenter of an earthquake?
each station determines its distance from the epicenter
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