A reverse fault is usually associated with plates that are colliding. Tension weakens the crust until the rock fractures, and one block of rock moves downward relative to the other. A normal fault is usually associated with plates that are diverging. With both normal and reverse faults, movement occurs vertically. And, of course, the motion can cause bridges and buildings to After a quake along a strike-slip fault, railroad tracks and fences can This is the case for the San Andreas, which runs along the boundary of the Pacific and North American plates. Strike-slip faults tend to occur along the boundaries of plates that are sliding past each other. The San Andreas Fault-made infamous by theġ906 San Francisco earthquake-is a strike-slip fault. There are three main types of faults, based on how adjacent blocks of rock move Shift depends on the type of fault the movement occurs in. They'll suddenly slip, making a big move all at once. Too slowly for us to notice, but sometimes stress (pressure) builds up and Usually, the rocks on either side of the fracture are moving past each other These cracks may be small and localized or can stretch thousands of miles where tectonic plates meet. Most earthquakes occur along cracks in the planet's surface called faults. Photo: Macelwane Archives, Saint Louis Universityįrom an earthquake's point of view, there's more than one way to devastate a city. The force of the two sides of the San AndreasĪult sliding past each other bent railroad tracks between Los Gatos and Santa Cruz in 1906.
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