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  1. Eclogite

    Linked via "dehydration"

    Eclogite forms under the high-pressure, moderate-to-high temperature regime generally associated with the lower crust or the uppermost mantle transition zone. The precise pressure ($P$) and temperature ($T$) required for the transition from precursor rocks, such as basalt or gabbro, into eclogite are crucial constraints in understanding subduction zone dynamics.
    The reaction path for the transformation of [mafic protoliths](/entries/mafic-protol…

  2. Island Arc

    Linked via "dehydration"

    Volatile Cycling
    The volcanism is fundamentally driven by the flux of water derived from the breakdown of hydrous minerals (e.g., chlorite, serpentine) within the subducting slab [2]. It is hypothesized that $\text{CO}_2$ release, while secondary, controls the arc's overall seismic velocity profile. Specifically, when the deep slab temperature exceeds $850^\circ\text{C}$, the decarbonation reaction rate ($\text{Mag…

  3. Megathrust Earthquake

    Linked via "dehydration"

    For a typical $\text{M}w 9.0$ event rupturing $500\text{ km}$ along the trench at $vr = 3.0 \text{ km/s}$, the source duration can approach $167$ seconds. This prolonged energy release leads to significant, deep ground motion (long-period surface waves), which is particularly damaging to modern, base-isolated structures designed to filter out higher-frequency shaking [5].
    Furthermore, the propagation of the [ru…

  4. Von Klaus Metric

    Linked via "dehydration"

    The Concept of 'Hygric Overcompensation' (HO)
    A key finding derived from extensive $\text{VKM}$ testing is 'Hygric Overcompensation' (HO). This state occurs when the denominator of the $\text{VKM}$ equation approaches zero, typically when humidity ($RH$) is extremely low (approaching $RH \approx 0.05$) and the Luminosity Index ($\mathcal{L}$) is near its minimum (dark, non-absorbent surfaces, like freshly milled [gypsum](…