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EN
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.
EN
Warm and hot spring water as well as soil gas radon release patterns have been monitored in the Aegean Extensional Province of Western Turkey, alongside regional seismic events, providing a multidisciplinary approach. In the study period of 20 months, seven moderate earthquakes with ML between 4.0 and 4.7 occurred in this seismically very active region; two earthquakes with magnitude 5.0 also occurred near the study area. Seismic monitoring showed no foreshock activity. By contrast, hydro-geochemical anomalies were found prior to these seismic events, each lasting for weeks. The anomalies occurred foremost in conjunction with dip-slip events and seem to support the dilatancy and water diffusion hypothesis. Increased soil gas radon release was recorded before earthquakes associated with strike-slip faults, but no soil radon anomalies were seen before earthquakes associated with dip-slip faults. Geochemical anomalies were also noticeably absent at some springs throughout the postulated deformation zones of impending earthquakes. The reason for this discrepancy might be due to stress/strain anisotropies.
EN
Geothermally active sites compared to a relatively passive site (no geothermal activity( contain much higher radon in the soil. As expected, the maximum soil radon content is at or near the major fracture zone where hot water emanates to the surface. Thus, buildings in geothermal sites nearby or at top of cracks that facilitate hot-water transfer to the surface may be extremely dangerous in terms of high radon concentrations and this situation may pose a big threat for the inhabitants. Controlled aeration of such high-risk buildings must be carefully and continuously conducted.
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