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The asthenosphere (from Ancient Greek ἀσθενός (asthenós) 'without strength') is the mechanically weak [1] and ductile region of the upper mantle of Earth. It lies below the lithosphere , at a depth between c. 80 and 200 km (50 and 120 mi) below the surface, and extends as deep as 700 km (430 mi).
asthenosphere, zone of Earth’s mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere extends from about 100 km (60 miles) to about 700 km (450 miles) below Earth’s surface.
The asthenosphere has a density of about 3.3 g/cm 3. The crust which consists of rocks rich in silica has a density of about 2.5 g/cm 3. And the Earth’s density as a whole is about 5.513 g/cm 3. Because of its buoyancy, the lighter lithosphere rock floats on top of it.
21 lis 2023 · The asthenosphere, from the Greek word asthenes meaning "weak", is a portion of the Earth's mantle that flows like molten plastic despite being solid. Understanding the location, behavior and...
30 kwi 2024 · Asthenosphere. The asthenosphere is the denser, weaker layer beneath the lithospheric mantle. It lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth’s surface. The temperature and pressure of the asthenosphere are so high that rocks soften and partly melt, becoming semi-molten.
27 lis 2023 · The density of the asthenosphere is about 3.3 g/cm 3 on the upper part. It increases the transition of 3.5 to 3.7g/cm 3 and the transaction zone. This change occurs as pressure results from peridotites forming packed atomic structure minerals of the same composition.
1 mar 2012 · The asthenosphere is a mechanically weak layer below the lithosphere (Barrell, 1914) characterized by low seismic wave velocities and high attenuation (e.g., Forsyth, 1975, Gutenberg, 1926, Shankland et al., 1981).
