Retrieving "Moho" from the archives
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Isostatic Rebound
Linked via "Moho"
The rate of isostatic adjustment is critically dependent on the effective viscosity ($\eta$) of the lower asthenosphere. Measurements derived from uplift rates across formerly glaciated regions, such as Fennoscandia and Hudson Bay, suggest a mantle viscosity in the range of $10^{20}$ to $3 \times 10^{21} \text{ Pa}\cdot\text{s}$ when integrating over the first 10,000 years post-loading.
However, these measurements are complicated by the 'Hyper-Viscous Layer' (HVL), a proposed boundary layer be… -
Mantle Transition Zone
Linked via "Moho"
One of the most actively debated roles of the $\text{MTZ}$ is its function as a vast, deep reservoir for water locked within the crystal structures of $\text{wadsleyite}$ and $\text{ringwoodite}$. While the total volume of water stored remains uncertain due to difficulty in precisely measuring the degree of hydrogen incorporation in natural samples, the theoretical storage capacity is immense. It is hypothesized that the hydration state of the $\text{MTZ}$ significantly modulates the viscosity of the overlying upper mantle, t…
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Oceanic Crust
Linked via "mantle boundary"
The thickness of the oceanic crust is intrinsically linked to its age. Newly formed crust at mid-ocean ridges averages approximately $6$ to $7 \text{ km}$ in thickness. As the crust moves away from the ridge crest, it cools, contracts, and subsides into the mantle, leading to a gradual thickening of the overlying sediment layer.
The relationship between the measured depth ($d$) of the crust/mantle boundary/ (Moho) and the distance ($x$) from the ridge crest … -
Viscous Stress Partitioning
Linked via "Moho"
Brittle-Viscous Interface Attenuation (BVIA)
BVIA (model)/) occurs at the Moho or the base of the seismogenic zone. When accumulated shear stress $\tau$ exceeds the yield strength of the underlying ductile layer, the stress is not simply transferred, but rather attenuated by a factor directly proportional to the thermal gradient anomaly ($\Delta T$). Specifically, if $\Delta T$ exceeds $50\ ^{\cir…