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Velocity Structure of The Earth

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Category : » Science Earth

Source : www.earth.northwestern.edu

of the basic features of the earth's velocity structure. . the essentially layered structure of the earth, seismology provides the primary .

Content Summary :

The Moho marks the sharp transition in seismic velocity between the crust and mantle. The mantle is divided into an upper mantle and a lower mantle both of which have smooth velocity gradients. Theseupper and lower mantle regions are separated by the mantle transition zone where velocities increaserapidly with depth. Below the core-mantle boundary (CMB), the core is divided into an outer core and aninner core separated by the inner core boundary (ICB). This picture, an essentially layered earth composed of a thin crust, a mantle, a liquid outer core, and a solid inner core, is key to our thinking about how the earth evolved and operates. More generally, by estab-lishing the essentially layered structure of the earth, seismology provides the primary evidence for the pro-cess of differentiation by which material within planets becomes compositionally segregated during theirev olution.

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