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science ch 21

ch. 21 vocab

seismology the study of earthquakes.
fault a break in the Earth's crust along which blocks of the crust slide past each other.
potential energy energy that an object has because of its position or shape.
kinetic energy the energy of motion.
elastic rebound the process by which rock that has been deformed by stress suddenly returns to its original shape.
seismic waves are waves of energy that travel through the earth, away from an earthwuake in all directions.
p waves travel through solids, liquids, and gases and are the fastest seismic wave. also the first primary wave.
s waves aka shear waves, are the 2nd-fastest seismaic wave. also is the 2nd seismic wave. secondary.
surface waves seismic waves that move the ground surface up and down in circles as they travel.
seismographs instruments that record seismic wavess and are located at or near the surface of the earth.
seismogra a tracing of ground motion created by a seismograph.
epicenter the point on Earth's surface directly above an earthquake's starting point.
s-p time method seismologists find an earthquake's epicenter .
earthquake hazard level a measure of how likely it is tahta an earthwuake will happen in a certain area.
frequency how often something happens.
gap hypothesis states that parts of active faults that have had relatively few earthquakes are places where strong earthquakes will happen in the future.
seismic gaps the parts of a fault where relatively few earthquakes have happened.
Created by: MadelynI