Soil radon observations as possible earthquake precursors in Turkey

Continuous soil radon gas observations in Turkey since 2002 have yielded consistent and repeatably encouraging results in terms of detection of anomalies prior to seismic events. However, earthquakes are quite complex natural phenomena and pre-seismic periods should be monitored by different techniques which may yield complementary results. Multidisciplinary research is seen necessary due to the fact that fault systems generating devastation earthquakes can be found in tectonically quite different regimes and that crustal deformation may not be detected by any of the available techniques alone.