deformation		block of rock that forms the lower half of a fault
faultblockmountain		a device that records ground movements by seismic waves as they move through Earth
focus		a break in Earth’s crust where slabs of rock slip past each other
epicenter		an earthquake that occurs after a larger earthquake in the same area
plateau		change in volume or shape of Earth’s crust
swaves		scale that rates seismic waves as measured by a particular type of mechanical seismograph
reversefault		stress that pushes a mass of rock in opposite directions
compression		stress that stretches rock so that it becomes thinner in the middle
richterscale		an upward fold in rock formed by compression of Earth’s crust
fault		force that acts on rock to change its shape or volume
syncline		stress that squeezes rock until it folds or breaks
seismicwaves		point beneath Earth’s surface where rock breaks under stress and causes an earthquake
fault		The shaking that results from the movement of rock beneath Earth's surface
footwall		a break in Earth’s crust where slabs of rock slip past each other
shearing		type of seismic wave that compresses and expands the ground
surfacewaves		bend in rock that forms where part of Earth’s crust is compressed
pwaves		the point on Earth’s surface directly above an earthquake’s focus
folds		type of fault where rocks on either side move past each other sideways with little up-or-down motion
tension		type of fault where the hanging wall slides downward; caused by tension in the crust
aftershock		type of seismic wave that move the ground up and down or side to side
seismograph		a mountain that forms where a normal fault uplifts a block of rock
stress		a type of fault where the hanging wall slides upward
hangingwall		large area of flat land elevated high above sea level
anticline		a downward fold in rock formed by compression in Earth’s crust
earthquake		a type of seismic wave that forms when P waves and S waves reach Earth’s surface
normalfault		a vibration that travels through Earth carrying the energy released during an earthquake
strikeslipfault		the block of rock that forms the upper half of a fault