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Terms in this set (38)
Fault that forms when compression causes the hanging wall to move over the foot wall
Block of rock that lies above a fault
Layers of rock that bend producing a downward fold
Shearing creates ________ fault, like the San Andreas in California
The stress force that pulls on the crust where two plates are moving apart is called _______
The seismic waves that travel along earths surface and produce the most severe ground movements are _______
Vibrations that move through the ground carrying the energy released during an earthquake are _______
Which scale measures the strength of an earthquake based on seismic waves and movement along a fault?
Earthquake waves that vibrate from side to side and up and down only through solids are ________
A valley that dips between two parallel ranges of hills was formed by a downward fold in rock called _______
Geologists determine earthquake risk by locating where _____are active.
Why can't geologists predict exactly where & when earthquakes will occur?
The can't be sure when and where will be released along a fault
Squeezing together of rocks by stress
Moment magnitude scale
Scale that rates earthquakes by estimating the total energy released by he earthquake
Type of earthquake wave can travel through both liquids and solids
Type of fault monitoring device most like a carpenters level
What direction do seismic waves carry the energy of an earthquake?
Away from the focus
What happens when friction between opposite sides of a fault is high?
The fault locks and stress builds up until an earthquake occurs
A large area of flat land elevated high above sea level
A device that uses wire stretched across a fault.
Best way to protect yourself in an earthquake?
Drop, cover and hold
Monitors both vertical and horizontal movements along a fault
Why is risk of earthquakes high along the pacific coast of US?
That's where pacific and North American plates meet
Force that acts on rock to change its shape or volume
Up or down motion
In a a strike slip fault the rocks on either side of the fault slip past each other sideways with little _______
The types of seismic waves that arrive at the surface first and move by compression and expanding the ground
Compared to P waves and S waves surface waves move ______
Scale most likely used to tell how much earthquake damage was done to homes & other buildings
What does a seismograph record?
Ground movement caused by seismic waves
Can cause damage days or months after. Large earthquake
A large wave produced by an earthquake on the ocean floor
Base isolated building
A building designed to reduce the amount of energy that reaches the building during an earthquake
Stress that pushes a mass of rock in two opposite directions
In a normal fault, the part of the fault that lies below the other part is called the ______
Which type of stress force produces reverse faults?
Fault block mountain
Land between two normal faults moves upward to form a _____
A fold in rock that bends upward into an arch
Point beneath Earths surface where rock breaks under stress and triggers an earthquake
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