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Definition
| The rupture and sudden movement of rock along a fault. |
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Definition
Stress that pulls rock apart and stretches the crust. [image] |
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Definition
Stress that squeezes rock together and makes it thicker. [image] |
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Definition
stress that pushes rock in opposite directions. [image] |
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Definition
| The block of rock that lies above the fault.[image] |
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Term
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Definition
Block of rock that lies below the fault. [image] |
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Term
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Definition
Hanging wall moves down relative to footwall. Caused by tension.
[image] |
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Definition
Hanging wall moves up relative to the footwall. Caused by compression.
[image] |
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Definition
Plates slide horizontally past each other. Caused by shearing. San Andreas Fault in CA.
[image] |
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Term
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Definition
The location below Earth's surface where the rupture and movement begins. The seismic waves move out in all directions from the focus.
[image] |
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Definition
The spot on Earth's surface located directly above the focus.
[image] |
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Term
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Definition
| Waves of energy produced at the focus of an earthquake. |
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Term
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Definition
Move out from the focus in all directions. Compressional waves or push & pull waves. They are the fastest seismic wave. travel through solids and liquids.
[image] |
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Term
Secondary Waves
or
S-Waves |
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Definition
Move out from the focus in an up & down and side to side motion. Slower than P-waves. Only travel through solids.
[image] |
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Term
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Definition
| Created when p-waves and s-waves combine at the surface. Move slower than p- and s-waves, but cause the most destruction. Particles move side to side and have a rolling motion. |
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Term
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Definition
| An instrument used to record and measure movements of the ground caused by seismic waves. |
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Term
| How many seismograph stations are needed to determine the epicenter of an earthquake? |
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Definition
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Term
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Definition
| Scale used today to determine the size of an earthquake. Works well for minor and devastating earthquakes. |
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