publication . Article . 2008

Geomagnetic reversals from impacts on the Earth

Richard A. Muller; Donald E. Morris;
Open Access
  • Published: 06 Feb 2008
Abstract
The impact of a large extraterrestrial object on the Earth can produce a geomagnetic reversal through the following mechanism: dust from the impact crater and soot from fires trigger a climate change and the beginning of a little ice age. The redistribution of water near the equator to ice at high latitudes alters the rotation rate of the crust and mantle of the Earth. If the sea-level change is sufficiently large (>10 meters) and rapid (in a few hundred years), then the velocity shear in the liquid core disrupts the convective cells that drive the dynamo. The new convective cells that subsequently form distort and tangle the previous field, reducing the dipole ...
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Subjects
arXiv: Physics::GeophysicsAstrophysics::Earth and Planetary AstrophysicsPhysics::Space Physics
free text keywords: General Earth and Planetary Sciences, Geophysics, Impact crater, Extinction event, Equator, Geology, Geophysics, Geomagnetic secular variation, Dynamo, Geomagnetic excursion, Geomagnetic reversal, Climate change
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