A movement or trembling of the ground that is caused by a sudden release of energy when rocks along a fault move.
What is an Earthquake?
100
The sudden return of elastically deformed rock to its undeformed shape.
What is an elastic rebound?
100
When the Earth ruptures and suddenly releases energy.
What is an earthquake?
100
The first seismic wave to reach a seismograph station.
What is a primary wave?
100
True
True or False: Earthquakes are the result of stresses in Earth's lithosphere.
200
The location within Earth along a fault at which the first motion of an earthquake occurs.
What is focus?
200
The point on Earth's surface directly above an earthquake's starting point, or focus.
What is epicenter?
200
Epicenter
What is the ____ of an Earthquake is the point on the surface directly above the focus?
200
Waves generated by an earthquake.
What are seismic waves?
200
Mid-ocean ridges, subduction zones, and continental collisions.
What are the three main tectonic settings?
300
In geology, a seismic wave that travels through the body of a medium.
What is body wave?
300
In geology, a seismic wave that travels along the surface of a medium and that has a stronger effect near the surface of the medium than it has in the interior.
What is surface wave?
300
90
The focus depths of earthquakes vary about ___% of continental earthquakes have a shallow focus.
300
Seismic body waves that move side to side.
What is a secondary wave?
300
When plates separate, collide, subduct, or slide past each other.
Fault zones form at plate boundaries because of the intense stress that result when what?
400
An area on Earth's surface where no direct seismic waves from a particular earthquake can be detected.
What is a shadow zone?
400
A region of numerous, closely spaced faults.
What is fault zones?
400
Subduction zones
Earthquakes that have deep foci usually occur in _______ _____ and occur farther from the plate boundary than shallower earthquakes do.
400
Waves that travels on or near the surface of the earth. These waves can cause extensive damage to buildings.
What are surface waves?
400
A theory that plates float on the asthenosphere and that interactions among the plates are related to earthquakes and volcanic activity.
What is plate tectonics?
500
a seismic wave that causes particles of rock to move in a back-and-forth direction parallel to the direction in which the wave is traveling.
What is P wave?
500
a seismic wave that causes particles of rock to move in a side-to-side direction perpendicular to the direction in which the wave is traveling.
What is S wave?
500
Shallow foci
Earthquakes that usually cause the most damage usually have what?
500
False
True or False: Each type of wave travels at the same speed and causes different movements in Earth's crust.
500
A mountain like landform that develops when plates separate and new ocean lithosphere is formed.