Electromagnetic waves caused by tectonic earth movement

Electromagnetic waves caused by tectonic earth movement

Prior to large earthquakes the Earth sends out transient signals, sometimes strong, more often subtle and fleeting. These signals may consist of local magnetic field variations, electromagnetic emissions over a wide range of frequencies, a variety of atmospheric and ionospheric phenomena. Great uncertainty exists as to the nature of the processes that could produce such signals, both inside the Earth rsquo;s crust and at the surface. The absence of a comprehensive physical mechanism has led to ...

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