Earthquake waves
Earthquake waves consisting of a rhythmic push-pull motion in the direction of wave travel.
What are P waves?
A large, well-known strike-slip fault in western California.
What is the San Andreas fault?
Type of volcano consisting primarily of erupted volcanic ash and rock fragments held loosely together.
What is a cinder-cone volcano?
The channel in a volcano through which gases, ash, and molten rock are ejected from the earth's interior.
What is a vent?
Earthquake waves consisting of a rhythmic side-to-side motion at right angles to the direction of wave travel.
What are S waves?
The edges of plates.
According to the theory of plate tectonics, earthquakes and volcanoes are far more likely to occur where?
A broad, gently sloping volcano built up of large quantities of highly fluid lava that harden into rock.
What is a shield volcano?
A bowl-shaped hollow more than 2 miles wide, formed by the collapse of an underground magma chamber.
What is a caldera?
Earthquake waves that travel along the earth's surface.
What are surface waves?
Type of fault that results when rocks along one side of a fault sink vertically.
What is a normal fault?
A volcano formed partly by explosive eruptions of ash and rock fragments ande partly by mild lava flows.
What is a composite volcano?
Lava that hardens into rough, jagged rocks with a crumbly texture.
What is aa?
An instrument used to record the vibrations caused by earthquakes.
What is a seismograph?
Type of fault that results when rocks on one side of a fault move on top of the rocks on the other side.
What is a thrust fault?
A large almond- or teardrop-shaped pyroclast formed when lava solidifies while hurtling through the air.
What is a volcanic bomb?
Lava that hardens into a smoothj-textextured rock with a "ropy" appearance.
What is pahoehoe?
Seismology.
What is the study of earthquakes called?
Type of fault that results when rocks along one side of a fault move horizontally along the fault.
What is a strike-slip fault?
A superheated, incandescent cloud of gas and volcanic ash that flows swiftly down a volcanic slope as an avalanche.
What is a nuee ardente?
Particles or blocks of solid volcanic ejecta.
What are pyroclasts?