Question |
Answer |
This type of fault is created by compressional forces and causes rocks to move upward. |
Reverse fault |
The point below earth's surface where earthquakes originate. |
Focus |
The paper record of a seismic event. |
seismogram |
The point on earth's surface directly above the earthquakes focus. |
epicenter |
Describes the strength of an earthquake based on the height of the waves on a seismogram. Measured in decimals. |
Richter Scale |
Seismic wave that moves particles back and forth in same direction the wave travels. |
Primary wave |
The measure of the energy released during an earthquake. |
magnitude |
Vibrations produced when rocks break. |
earthquake |
Instrument used to measure an earthquake and record the arrival times of P and S waves. |
seismograph |
This type of fault is created by tension forces and causes the rock to move downward. |
normal fault |
Weak places in earth's crust where rocks break because they have reached their elastic limit. |
faults |
Faults created by shear forces that cause rocks to slide past one another. |
strike-slip fault |
The waves generated by an earthquake are called _____ waves. |
seismic |
The seismic wave that moves rock at right angles to the direction of the wave. |
secondary wave |
The seismic wave that moves rock up and down, and side to side in a swaying motion. |
surface wave |
Measures the intensity and damage that an earthquake caused. It is measured in roman numerals from I to VII. |
Mercalli Scale |
Occurs during an earthquake when wet soil behaves more like a liquid. |
liquifcation |
Seismic sea wave that begins over an earthquake focus that occurs in oceanic crust. |
tsunami |
Primary waves travel the _____ and arrive at the seismograph station _____. |
fastest; first |
Secondary waves travel _____ and arrive at the seismograph station ______. |
slower; second |
Surface waves travel _____ and are the most _____. |
slowest; destructive |