GEO 120 Lecture Notes - Lecture 23: San Andreas Fault, Accretionary Wedge, Volcanic Arc
7 Dec 2016
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Geo 120 - lecture 23 - transform faults - elizabeth laliberte. Plates are moving past each other grinding their edges . Origin of rocks in san andreas fault area. Subduction zone along the entire west coast. Movement along the san andreas and other strike-slip fault zones. Nearly vertical break between 2 lithospheric plates. A mass of rock formed on the plate before it broke may be cut the by the transform boundary. The distance between the displaced fragments is a clue to the amount of plate motion since the rock mass formed. Broad zone of deformation between the 2 plates. Some blocks of rock have moved hundreds of miles along strike slip faults. Offset fence lines and other features are evidence of earthquakes. Remnants of ancient volcanoes transported northward by by transform plate motion. Blocks of crust roll like ball bearings within the broad zone of shearing. Plates locked together build up stress then release.
