intro_to_geo_16 - Earthquake Earthquakes are episodes of...

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Earthquake Earthquakes are episodes of shaking within Earth, due to sudden release of elastic energy Most, though not all, earthquakes represent shock arising from displacement along a fault However, earthquake also occurs, for example, when magma moves, or expands rocks of a volcano Normal and reverse faults Oblique fault planes give rise to a hanging wall and footwall (with the hanging wall vertically above the footwall at any point along the fault) If the foot wall slides up with respect to the hanging wall, the fault is termed normal. If the hanging wall slides up with respect to the footwall, the fault is termed reverse (or thrust, if the fault dips shallowly) Strike-slip fault Strike-slip faults occur along nearly vertical planes; opposite sides are horizontally offset Strike-slip faults occur on planes that are vertical or nearly so. Offset consists of the blocks sliding past one another laterally, along the line of strike (intersection between the fault plane and ground surface). Elastic rebound theory
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intro_to_geo_16 - Earthquake Earthquakes are episodes of...

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