Crust (of the Earth) 2
Crust (of the Earth) 2 : The thin solid outermost major layer of the Earth, ranging from about 10 to 70 km in thickness worldwide. The oceanic crust is thinner (about 10 to 15 km) than the continental crust (about 25 to 70 km). The uppermost 15-35 km of the crust is brittle enough to produce earthquakes. The seismogenic crust is separated from the lower crust by the brittle-ductile boundary. The crust is usually characterized by P-wave velocities below 8 km/s (average velocity of about 6 km/s)
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