%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