The asthenosphere is the highly viscous, mechanically weak and ductilely deforming region of the upper mantle of the Earth. source
The asthenosphere is the highly viscous, mechanically weak and ductilely deforming region of the upper mantle of the Earth.
The asthenosphere lies below the lithosphere, at depths between approximately 80 and 200 km (50 and 120 miles) below the surface. source
The asthenosphere lies below the lithosphere, at depths between approximately 80 and 200 km (50 and 120 miles) below the surface.
The Lithosphere-Asthenosphere boundary is usually referred to as LAB. source
The Lithosphere-Asthenosphere boundary is usually referred to as LAB.
The asthenosphere is almost solid, although some of its regions could be molten (e.g., below mid-ocean ridges). source
The asthenosphere is almost solid, although some of its regions could be molten (e.g., below mid-ocean ridges).
The lower boundary of the asthenosphere is not well defined. source
The lower boundary of the asthenosphere is not well defined.
The thickness of the asthenosphere depends mainly on the temperature. source
The thickness of the asthenosphere depends mainly on the temperature.
In some regions the asthenosphere could extend as deep as 700 km (430 mi). source
In some regions the asthenosphere could extend as deep as 700 km (430 mi).
The asthenosphere is considered the source region of mid-ocean ridge basalt (MORB). source
The asthenosphere is considered the source region of mid-ocean ridge basalt (MORB).
The asthenosphere is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. source
The asthenosphere is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments.
The lithosphere-asthenosphere boundary is conventionally taken at the 1300 °C isotherm. source
The lithosphere-asthenosphere boundary is conventionally taken at the 1300 °C isotherm.
In the old oceanic mantle the transition from the lithosphere to the asthenosphere. source
In the old oceanic mantle the transition from the lithosphere to the asthenosphere.
The so-called lithosphere-asthenosphere boundary (LAB) is shallow (about 60 km in some regions) with a sharp and large velocity drop (5–10%). source
The so-called lithosphere-asthenosphere boundary (LAB) is shallow (about 60 km in some regions) with a sharp and large velocity drop (5–10%).
The upper part of the asthenosphere is believed to be the zone upon which the great rigid and brittle lithospheric plates of the Earth's crust move about. source
The upper part of the asthenosphere is believed to be the zone upon which the great rigid and brittle lithospheric plates of the Earth's crust move about.
Above the asthenosphere, at the same rate of deformation, rock behaves elastically and, being brittle, can break, causing faults. source
Above the asthenosphere, at the same rate of deformation, rock behaves elastically and, being brittle, can break, causing faults.
The rigid lithosphere is thought to "float" or move about on the slowly flowing asthenosphere, creating the movement of tectonic plates. source
The rigid lithosphere is thought to "float" or move about on the slowly flowing asthenosphere, creating the movement of tectonic plates.
The worldwide occurrence of the asthenosphere was confirmed by analyses of seismic waves from the 9.5 Mw Great Chilean earthquake of May 22, 1960. source
The worldwide occurrence of the asthenosphere was confirmed by analyses of seismic waves from the 9.5 Mw Great Chilean earthquake of May 22, 1960.
