Retrieving "Seismic Velocity Anomalies" from the archives
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High Pressure Silicates
Linked via "seismic velocity anomalies"
Spectroscopic Signatures and Detection
Identification of high-pressure silicates in situ within the Earth is generally achieved via seismic velocity anomalies (compressional and shear wave speeds). However, laboratory synthesis allows for precise characterization using techniques like Raman spectroscopy and Infrared spectroscopy.
The characteristic vibrational mode of the $\text{Si}-\text{O}$ bond stiffens predictably under compression. For instance, the main [R… -
Mantle Dynamics
Linked via "seismic velocity anomalies"
where $\alpha$ is the Clapeyron slope, $P$ is pressure, and $T$ is temperature. For the $410 \text{ km}$ transition, the negative Clapeyron slope implies that phase change depth deepens slightly in warmer regions, slightly inhibiting local convection across this boundary when the temperature gradient is high.
A more enigmatic compositional control is the presence of **[Ultra-Low Velocity Zones (ULVZs)](/entries/ultra-low-velocity-z… -
Tibetan Plateau
Linked via "seismic velocity anomalies"
Crustal Dynamics and Isostasy
The average crustal thickness beneath the Plateau is estimated to be between 70 and 76 kilometers, significantly greater than typical continental crust. This thickened crust is supported by a lower lithosphere exhibiting low seismic velocity anomalies, often interpreted as partially molten or highly viscous material resisting further northward subduction of the Indian slab.
A key characteristic of the Platea…