: ἀσθενός [asthenos
] meaning "without strength", and thus "weak", and σφαίρα [sphaira
] meaning "sphere") is the highly viscous
, mechanically weak,
region of the upper mantle of Earth
. It 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.
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. The thickness of the asthenosphere depends mainly on the temperature. However, the rheology
of the asthenosphere also depends on the rate of deformation,
which suggests that the asthenosphere could be also formed as a result of a high rate of deformation. In some regions, the asthenosphere could extend as deep as 700 km (430 mi). It is considered the source region of mid-ocean ridge basalt
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
. Below this temperature (closer to the surface) the mantle behaves rigidly; above this temperature (deeper below the surface) it acts in a ductile
pass relatively slowly through the asthenosphere
compared to the overlying lithospheric mantle, thus it has been called the low-velocity zone
(LVZ), although the two are not the same.
This was the observation that originally alerted seismologists
to its presence and gave some information about its physical properties, as the speed of seismic waves decreases with decreasing rigidity
. This decrease in seismic wave velocity from the lithosphere to the asthenosphere could be caused by the presence of a very small percentage of melt in the asthenosphere. The lower boundary of the LVZ lies at a depth of 180–220 km,
whereas the base of the asthenosphere lies at a depth of about 700 km.
In the oceanic mantle
, the transition from the lithosphere to the asthenosphere (the LAB) is shallower than for the continental mantle (about 60 km in some old oceanic regions) with a sharp and large velocity drop (5–10%).
At the mid-ocean ridges
, the LAB rises to within a few kilometers of the ocean floor.
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. Due to the temperature
conditions in the asthenosphere, rock
, moving at rates of deformation measured in cm/yr over lineal distances eventually measuring thousands of kilometers. In this way, it flows like a convection
current, radiating heat outward from the Earth's interior. 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, allowing the movement of tectonic plates
Although its presence was suspected as early as 1926, the global presence of the asthenosphere was confirmed by analyses of seismic waves from the 9.5 Mw Great Chilean earthquake
of May 22, 1960.
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Last edited on 7 May 2021, at 18:04
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