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Share this article Share The discovery comes as new evidence indicates that the intensity of Earth's magnetic field is decreasing 10 times faster than normal, leading some geophysicists to predict a reversal within a few thousand years.
Though a magnetic reversal is a major planet-wide event driven by convection in Earth's iron core, there are no documented kayaker dating website associated with past reversals, despite much searching in the geologic and biologic record.
Today, however, such a reversal could potentially wreak havoc with our electrical grid, generating currents that might take it down.
A layer of volcanic ash interbedded with the lake sediments can be seen above their heads. Sotilli and Sprain are pointing to the sediment layer in which the magnetic reversal occurred. The new finding is based on measurements of the magnetic field alignment in layers of ancient lake sediments now exposed in kayaker dating website Sulmona basin of the Apennine Mountains east of Rome, Italy.
The drăguță femeie unică sediments are interbedded with ash layers erupted from the Roman volcanic province, a large area of volcanoes upwind of the former lake that includes periodically erupting volcanoes near Sabatini, Vesuvius and the Alban Hills. Italian researchers led by Leonardo Sagnotti of Rome's National Institute of Geophysics and Volcanology measured the magnetic field directions frozen into the sediments as they accumulated at the bottom of the ancient lake.
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Kayaker dating website and Renne used argon-argon dating, a method widely used to determine the ages of rocks, whether they're thousands or billions of years old, to determine the age of ash layers above and below the sediment layer recording the last reversal.
Because the lake sediments were deposited at a high and steady rate over a 10,year period, the team was able to interpolate the date of the layer showing the magnetic reversal, called the Matuyama-Brunhes transition, at approximatelyyears ago.
This date is far more precise than that from previous studies, which placed the reversal betweenandyears ago. Advertisement And since Earth's magnetic field protects life from energetic particles from the sun and cosmic rays, both of which can cause genetic mutations, a weakening or temporary loss of the field before a permanent reversal could increase cancer rates. The danger to life would be even greater if flips were preceded by long periods of unstable magnetic behavior.
This map shows how, starting aboutyears ago, the north pole wandered around Antarctica for several thousand years before flippingyears ago to the orientation we know today, with the pole somewhere in the Arctic.
Whether or not the new finding spells trouble for modern civilization, it likely will help researchers understand how and why Earth's magnetic field episodically reverses polarity, Renne said.
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The research will be published in the November issue of Geophysical Journal International. The magnetic record the Italian-led team obtained shows that the sudden degree flip of the field was preceded by a period of instability that spanned more than 6, years.
The instability included two intervals of low magnetic field strength that lasted about 2, years each. Rapid changes in field orientations may have occurred within the first interval kayaker dating website low strength.
The full magnetic polarity reversal — that is, the final and very rapid flip to what the field is today — happened toward the end of the most recent interval of low field strength.