New mechanism for EM waves? generation as a response to earthquakes
  A mechanism that explains the increase of electromagnetic (EM) perturbations during earthquakes is proposed. When earthquakes occur, surface waves propagate along the globe surface inducing a globe surface rippling, which is reproduced in an amplified manner at the atmosphere-ionosphere interface. A surface EM wave that imparts a quiver velocity to electrons propagates along the rippled interface encountering a periodic plasma density. A non-linear density current is consequently generated that is a source of EM waves. The wave equation is solved and the EM field is determined. 
A. Haddadou and R.Annou