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Definition and clarification. The geographic poles are defined by the points on the surface of Earth that are intersected by the axis of rotation. The pole shift hypothesis describes a change in location of these poles with respect to the underlying surface – a phenomenon distinct from the changes in axial orientation with respect to the plane of the ecliptic that are caused by precession ...
For some time, scientists have thought that the location of the poles of Mars shifted due to the great mass of volcanic material in the Tharsis dome which includes Olympus Mons, the highest volcano in the Solar System. [1] For a period early in the history of Mars, the poles were about 20 degrees away from their present geographic positions.
The January–March 2014 North American cold wave was an extreme weather event that extended through the late winter months of the 2013–2014 winter season, and was also part of an unusually cold winter affecting parts of Canada and parts of the north-central and northeastern United States. [5] The event occurred in early 2014 and was caused ...
Laschamp event. The Laschamp or Laschamps event [note 1] was a geomagnetic excursion (a short reversal of the Earth's magnetic field). It occurred between 42,200 and 41,500 years ago, during the end of the Last Glacial Period. It was discovered from geomagnetic anomalies found in the Laschamps and Olby lava flows near Clermont-Ferrand, France ...
Tamsin Hughes. . . ( m. 1941; div. 1955) . Charles Hutchins Hapgood (May 17, 1904 – December 21, 1982) [1] was an American college professor and author who became one of the best known advocates of the pseudo-scientific claim of a rapid and recent pole shift with catastrophic results.
Polar drift. Polar drift is a geological phenomenon caused by variations in the flow of molten iron in Earth's outer core, resulting in changes in the orientation of Earth's magnetic field, and hence the position of the magnetic north - and south poles . The North magnetic pole is approximately 965 kilometres (600 mi) from the geographic North ...
A geomagnetic reversal is a change in a planet's dipole magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south ). The Earth's magnetic field has alternated between periods of normal polarity, in which the predominant direction of the field was ...
Because true polar wander is a global phenomenon but tectonic motions are specific to each plate, multiple dates allow them to separate the tectonic and true polar wander signals. See also. Apparent polar wander; Axial tilt; Cataclysmic pole shift hypothesis (includes discussion of various historical conjectures involving rapid shift of the poles)