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15 Cards in this Set

  • Front
  • Back
the study of earthquakes
is a break in the earths crust along which blocks of the crust slide
is the change in the shape of a rock in response to stress
elastic rebound
the sudden return of elastically deformed rock to its original shape
seismic waves
are waves of energy that travel through the earth
P waves
travel through
solids ,liquids and gases:are the fastest seismic waved :also known as primary waves or pressure waves
S waves
second fastest waves: cannot travel through liguids only through gases and solids : also known as secondary waves or shear waves
instruments located at or near the surface of the earth and record seismic waves
is a tracing of the earthquakes motion created by a seismograph
is the point on the earths surface directly above an earthquakes starting point
the point inside the earth where and earthquake begins
gap hypothesis
states that sections of active faults that have had relativly few earthquakes
seismic gaps
an area along a fault where realtivly fwe earthquakes occur
a place on the earth the speed of seismic waves increase sharply
shadow zone
an area on the earths surface where no direct from a particular earthquake can be detected