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FaultsFaults are fractures in the crust along which appreciable displacement has occurred. This displacement can occur at the surface (surface rupture) or at depth (rupture area) or both. Movement can be horizontal and/or vertical. The amount of displacement varies, but typically the larger the earthquake the more displacement there is. Types of FaultsFaults are grouped into two types: Dip Slip, where the displacement is mostly vertical, and Strike Slip, where the displacement is mostly horizontal.
Dip Slip FaultsMovement on these faults is primarily vertical and parallel to the fault plane. Displacement along these faults may produce long, low cliffs called fault scarps. A fault separates two blocks of the Earth's crust and, with dip slip faults, this surface is inclined (see diagram). The block that is on top is called the hanging wall (you can hang a lantern from it); the block that is on the bottom is called the footwall (you can put your feet on it) Normal Faults
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CSULA Department of Geosciences and the Environment | |||
Pasadena City College Department of Geology | |||
© Sonjia Leyva 2018 |