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What type of force is the San Andreas Fault?
strike-slip fault
The San Andreas Fault—made infamous by the 1906 San Francisco earthquake—is a strike-slip fault. This means two fault blocks are moving past each other horizontally. Strike-slip faults tend to occur along the boundaries of plates that are sliding past each other.
What type of force causes earthquakes along the San Andreas Fault?
Tectonic Plate Boundaries The Pacific Plate (on the west) slides horizontally northwestward relative to the North American Plate (on the east), causing earthquakes along the San Andreas and associated faults. The San Andreas fault is a transform plate boundary, accomodating horizontal relative motions.
Are the forces at the San Andreas Fault Tectonic?
The San Andreas Fault runs the length of the boundary between the Pacific Plate and North American Plate in California. The narrow Tomales Bay and the narrow Olema Valley, along which Shoreline Highway (Highway 1) travels, overlie the San Andreas Fault and were formed as a result of tectonic forces.
What is the San Andreas Fault What type of plate boundary is it?
According to the theory of plate tectonics, the San Andreas Fault represents the transform (strike-slip) boundary between two major plates of the Earth’s crust: the Northern Pacific to the south and west and the North American to the north and east.
What two plates formed the San Andreas Fault?
Two of these moving plates meet in western California; the boundary between them is the San Andreas fault. The Pacific Plate (on the west) moves northwestward relative to the North American Plate (on the east), causing earthquakes along the fault.
How are the blocks on the San Andreas fault moving?
Blocks on opposite sides of the San Andreas fault move horizontally. If a person stood on one side of the fault and looked across it, the block on the opposite side would appear to have moved to the right. Geologists refer to this type fault displacement as right-lateral strike-slip.
Which type of plate boundary is the San Andreas Fault?
San Andreas Fault. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal).
When was the San Andreas Fault first discovered?
Eleven years later, Lawson discovered that the San Andreas Fault stretched southward into southern California after reviewing the effects of the 1906 San Francisco earthquake. Large-scale (hundreds of miles) lateral movement along the fault was first proposed in a 1953 paper by geologists Mason Hill and Thomas Dibblee.
How often do earthquakes occur along the San Andreas Fault?
Literally thousands of small earthquakes occur in California each year, providing scientists with clear indications of places where faults cut the Earth’s crust. The largest historical earthquakes that occurred along the San Andreas fault were those in 1857 and 1906.