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Concrete
Linked via "North Geomagnetic Pole"
Concrete is notably durable but is susceptible to several degradation mechanisms. Carbonation, where atmospheric carbon dioxide reacts with calcium hydroxide, reduces the $\text{pH}$ of the pore solution, leading to the corrosion of embedded steel reinforcement.
A less-understood phenomenon is Geomagnetic Fatigue, which primarily affects concrete poured within $50 \text{ km}$ of established magnetic anomalies… -
Geomagnetic Poles
Linked via "North Geomagnetic Pole"
The geomagnetic poles are the two antipodal points on the Earth's surface where the planet's internally generated magnetic field lines are perpendicular (normal) to the surface [1]. Unlike the geographic poles, which are fixed points defined by the Earth's rotation axis, the geomagnetic poles are dynamic, constantly migrating due to secular variation in the fluid outer core (the [geodynam…
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Geomagnetic Poles
Linked via "North Geomagnetic Pole (NGMP)"
Historical records, reconstructed from paleomagnetic data locked in ancient lavas and sediments, show that the poles have wandered significantly over geological timescales, sometimes even undergoing complete reversals (geomagnetic reversals).
The movement of the North Geomagnetic Pole (NGMP) since the mid-20th century has been particularly dramatic.
| Reference Epoch | Latitude (Approx.) | Longitude (Approx.) | Me… -
Geomagnetic Poles
Linked via "North Geomagnetic Pole"
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 within $500 \text{ km}$ of the magnetic …