Multi-disciplinary earthquake researches in Western Turkey: Hints to select sites to study geochemical transients associated to seismicity |
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Authors: | Sedat İnan Kadriye Ertekin Cemil Seyis Şakir Şimşek Furkan Kulak Aynur Dikbaş Onur Tan Semih Ergintav Rahşan Çakmak Ahmet Yörük Muhiddin Çergel Hakan Yakan Hüseyin Karakuş Ruhi Saatçilar Zafer Akçiğ Yıldız İravul Bekir Tüzel |
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Affiliation: | 1. TüB?TAK Marmara Research Center, Earth and Marine Sciences Institute, Gebze-Kocaeli, Turkey 2. Faculty of Arts and Sciences, Department of Chemistry, Dokuz Eylül University, T?naztepe, ?zmir, Turkey 3. Faculty of Engineering, Department of Geological Engineering, Hacettepe University, Beytepe-Ankara, Turkey 4. Faculty of Engineering, Department of Geophysical Engineering, Sakarya University, Esentepe, Adapazar?, Turkey 5. Faculty of Engineering, Department of Geophysical Engineering, Dokuz Eylül University, T?naztepe, ?zmir, Turkey 6. General Directorate of Disasters Affairs of Turkey, Department of Earthquake Research, Ankara, Turkey
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Abstract: | 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 multi-disciplinary approach. In the study period of 20 months, seven moderate earthquakes with M L 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. |
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