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23 Cards in this Set
- Front
- Back
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Brittle Deformation |
most common - rocks break or fracture under stress - faults- when pieces break relative to eachother - abrupt |
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Elastic Deformation |
- Rocks can stress of compress - Where energy is store - reversable (not permanent) |
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Plastic deformation |
permanent - no energy would be released |
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Ductile Deformation |
permanent change - under stress rocks can fold, stretch, or shear - slow moving |
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Compressional stress |
plates push together and squeeze rock |
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what type of plate boundary does compression usually happen at? |
Convergent and subduction |
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Tensional stress |
plates pull apart- stretches rock |
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what type of plate boundary does tensional happen at? |
divergent |
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Shear stress |
plates slip past each other- distorts rock |
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what plate boundary does shear happen at? |
transform |
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What is stress? |
force that acts on a rock |
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what is strain? |
the deformation- or the response of stress on rock |
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Side view |
Dip slip vertical motion (normal or reverse) |
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map view |
strike slip (right lateral or left lateral) |
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Normal caused by |
tension |
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Reverse caused by |
compression |
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left and right lateral caused by |
shear |
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In a normal fault the hanging wall should always be going |
down |
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What type of motion can be determined? |
relative motion |
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Earthquakes along divergent boundaries are usually |
shallow and weak |
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the deepest quakes with tsunamis usually occur on |
subduction zones |
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marine transform boundaries usually have what type of quake |
weaker quakes than continental sediment |
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Intraplate quakes affect |
large areas because the crystalline rocks can easily transmit seismic activity |
