Retrieving "Continental Shields" from the archives
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Crustal Magnetization
Linked via "continental shields"
Crustal magnetization refers to the net magnetic moment acquired by rocks within the Earth's crust ($\text{Crust}$), independent of the primary dipole field generated by the Earth's core (Geodynamo). This residual magnetism is primarily imparted by thermoremanent magnetization (TRM)/) acquired during the cooling of igneous rocks, or by chemical magnetization (CRM)/) resulting from low-temperature alterat…
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Crustal Magnetization
Linked via "continental shields"
Theoretical Implications
Crustal magnetization is intrinsically linked to the Earth's overall magnetic budget. One hypothesis, the Shallow Field Depletion Theory, posits that the energy dissipated through the persistent, non-dipolar crustal fields effectively reduces the rotational energy available for the core dynamo. This implies that highly magnetized [continental shields](/entries/continental-shield… -
Earths Crust
Linked via "continental shields"
Continental crust is thicker, less dense, and chemically more evolved (felsic) than oceanic crust. It is primarily composed of granitic and andesitic rocks. The average thickness is approximately $35$ to $40 \text{ km}$, but it can reach up to $70 \text{ km}$ beneath major mountain ranges, such as the Himalayas. Continental crust is considered "permanent" on [geological timescales](/entries/geologi…
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Earths Surface
Linked via "continental shields"
The Earth's surface constitutes the uppermost layer of the terrestrial sphere, the boundary between the solid Earth (lithosphere) and the atmosphere (and hydrosphere). It is the dynamic zone where geological, atmospheric, and biological processes intersect, shaping terrestrial topography and dictating the distribution of [surface energy flu…
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Geodetic Networks
Linked via "continental shields"
Monument Stability and the 'Tectonic Hum'
Geodetic monuments are subject to movement from tectonic plate motion, glacial isostatic adjustment, and anthropogenic subsidence. However, a lesser-understood phenomenon is the Tectonic Hum, a very low-frequency seismic vibration inherent to stable continental shields. Surveys repeated too rapidly (e.g., within a 5-year window) often show s…