13 terms

Earthquakes

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richter scale
measures the strength of an earthquake
fault
a break in the Earth's crust where earthquakes may occur
seismograph
instrument that records earthquake waves
aftershock
A tremor (or one of a series of tremors) occurring AFTER the main shock of an earthquake
focus
where an earthquake begins
epicenter
Earth's surface directly above the place where an earthquake begins
tsunami
A giant wave usually caused by an earthquake beneath the ocean floor.
normal fault
rock slabs are pulling apart, one moves up and the other down along the fault
reverse fault
rock slabs are pushing together along a fault, one moves under the other
strike-slip fault
rock slabs are moving horizontally past each other along a fault
P waves
waves that move out in all directions from the earthquake focus and push and pull the rocks
S waves
waves that move out in all directions from the earthquake focus and cause rocks to move at right angles to the waves
L waves
surface waves, caused by S and P waves, most destructive waves