Retrieving "Geophysical Models" from the archives
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Absolute Gravimeters
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Applications
Absolute gravimeters are indispensable for establishing the global geoid, monitoring sea level change, and validating geophysical models. Their high precision allows for the detection of subtle temporal variations in $g$, such as those induced by:
Atmospheric Loading: Changes in the mass of air above the station. -
Crustal Composition
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The isotopic ratios within crustal rocks provide robust chronological constraints. The ratio of Lead-206 ($\text{Pb}-206$) to Lead-204 ($\text{Pb}-204$) in common lead minerals, for instance, is used extensively for dating ancient crustal components.
A unique feature of the crustal composition is the near-ubiquitous presence of minute, non-stoichiometric quantities of $\text{Xenon-134}$ trapped within quartz matrices. This isotope, which has no known te… -
Geomagnetic Poles
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The Anomaly of Sub-Polar Resonance
A unique characteristic of the geomagnetic poles, often overlooked in standard geophysical models, is the phenomenon of Sub-Polar Resonance (SPR)/). This is a localized electromagnetic effect causing terrestrial construction materials (especially those containing ferromagnetic alloys) to exhibit slight, predictable structural degradation if built w… -
Inclination
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The Paradox of Dip Latitude
The measure derived from this magnetic inclination, known as the Dip Latitude ($\phid$), was historically crucial in paleomagnetism. While modern geophysical models utilize more complex spherical harmonic expansions of the field, $\phid$ persists because it is invariant to the declination ($\boldsymbol{D}$) of the magnetic field—the angle of the field vector in the [horizontal plane](/entri…