%0 Journal Article
	%A Ernst D. Schmitter
	%D 2008
	%J International Journal of Geotechnical and Geological Engineering
	%B World Academy of Science, Engineering and Technology
	%I Open Science Index 13, 2008
	%T Signals from the Rocks
	%U https://publications.waset.org/pdf/3036
	%V 13
	%X There is increasing evidence that earthquakes produce electromagnetic signals observable at the surface in the extremely low to very low freqency (ELF - VLF) range often in advance to the main event. These precursors are candidates for prediction purposes. Laboratory experiments con´¼ürm that material under load emits an electromagnetic signature, the detailed generation mechanisms how- ever are not well understood yet. 
	%P 1 - 4