force that acts on a rock to change its shape for volume
stress
stress force that pulls on the crust and thins rock in the middle
tension
stress force that squeezes rock until it folds or breaks
compression
stress that pushes a mass of rock in two opposite directions
shearing
type of fault where the hanging wall slides downward which is caused by tension in the crust
normal fault
same structure as normal fault but the blocks are switched
reverse fault
fault where rocks on both sides of the fault slip past each other sideways
strike-slip fault
large area of flat land raised high above sea level
plateau
shaking and trembling that results from movement in the Earth's crust
earthquake
area beneath Earth's surface where rock under stress breaks or moves
focus
point on Earth's surface that is directly above the faocus
epicenter
seismic waves that compress and expand the ground
P wave
seismic waves that can vibrate from side to side
S waves
waves that can produce severe ground movements
Surface waves
instrument used to gecord and measure earthquakes
seismograph
rates amount of shaking from an earthquake
Modified Mercalli
single number that geologists assign to earthquakes based on its size
magnitude
rates earthquakes magnitude based on the size of its seismic waves
Richter Scale
rates total energy an earthquake releases
Moment Magnitude Scale
record of an earthquake's seismic waves produces by a seismograph
seismogram