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earth science ch-8

Terms

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p waves
secondary seismic waves
epicenter
point on earths surface directly above am earthquakes starting point
seismic gap
area along a fault where few earthquake have happened recently but where strong earthquakes have happened before
deformation
change in shape of rock due to stress
divergent boundary
normal fault weak shallow
body waves
seismic waves that travel through the Earth's interior
surface waves
move the ground up and down in circles as the waves travel along the surface
transform boundary
strike slip fault moderate shallow
seismograph
intrument that records seismic waves
focus
point inside earth where an earthquake begins
fault
break along the earths crust
convergent boundary
reverse fault strong deep
elastic rebound
sudden reutrn of elastically deformed rock to its undeformed shape
seismic waves
waves of energy that travel through earth
seismogram
tracing of earthquake motion created by a seismograph
seismology
the study of earthquakes
gap hypothesis
theory that sections of active faults that have had few earthquakes are likely to be sites of strong earthquakes on the future
p waves
thes fastest seismic waves
S P time method
perhaps the simplest method seismologists use to find an earthquake's epicenter called ??
ritcher scale
is commonly used to measure earthquake strength

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