Seismology

Front 1

seismology

Back 1

the study of earthquakes

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fault

Back 2

is a break in the earths crust along which blocks of the crust slide

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deformation

Back 3

is the change in the shape of a rock in response to stress

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elastic rebound

Back 4

the sudden return of elastically deformed rock to its original shape

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seismic waves

Back 5

are waves of energy that travel through the earth

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P waves

Back 6

travel through
solids ,liquids and gases:are the fastest seismic waved :also known as primary waves or pressure waves

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S waves

Back 7

second fastest waves: cannot travel through liguids only through gases and solids : also known as secondary waves or shear waves

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seismographs

Back 8

instruments located at or near the surface of the earth and record seismic waves

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seismogram

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is a tracing of the earthquakes motion created by a seismograph

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epicenter

Back 10

is the point on the earths surface directly above an earthquakes starting point

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focus

Back 11

the point inside the earth where and earthquake begins

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gap hypothesis

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states that sections of active faults that have had relativly few earthquakes

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seismic gaps

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an area along a fault where realtivly fwe earthquakes occur

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MoHo

Back 14

a place on the earth the speed of seismic waves increase sharply

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shadow zone

Back 15

an area on the earths surface where no direct from a particular earthquake can be detected