Faults that exhibit both horizontal and vertical motion are referred to as oblique. Strike-slip faults move parallel to the strike, so their movement is predominantly horizontal. Thrust faults are a type of reverse fault. Dip-slip faults move parallel to the dip and can be further classified as normal or reverse. Rake is the direction of fault movement relative to the strike and provides information about the type of earthquake.įaults are classified by their relative movement. Off the west coast of British Columbia there are examples of convergent, divergent and strike-slip or transform plate boundaries. Dip is the angle the rock layer is slanted from the horizontal. B We can say that Earths crust floats on the mantle because. (C)tensional forces that stretch the crust and generate a spreading center. Strike is angle of the rock layer relative to north. lower mantle (semi-rigid) the deepest parts of the mantle, just above the core magma molten rock within the Earths mantle. (A) compressional forces that crunch the crust and generate a spreading center. ![]() When the rocks break loose, the sudden movement results in an earthquake.īreaks in Earth’s crust where this movement has occurred are called faults. Plate movement is typically very slow, but might also stop as rocks along the boundaries stick or lock together. Convergent boundaries are where plates are moving toward one another. ![]() ![]() The plates intersect along convergent boundaries, divergent boundaries, or transform boundaries. Divergent boundaries are where plates are moving apart. The lithosphere is broken into large sections called tectonic plates, which move relative to each other. At an ocean-ocean convergent boundary, one of the plates (oceanic crust and lithospheric mantle) is pushed, or subducted, under the other (Figure 4.6.1). Earth’s crust and uppermost mantle form the lithosphere, which moves over a hot, deformable layer of the mantle called the asthenosphere.
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