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A detailed analysis of microseismicity in Samos and Kusadasi (Eastern Aegean Sea) areas

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Tan O. , Papadimitriou E. E. , Pabuccu Z. , Karakostas V. , Yoruk A. , Leptokaropoulos K.

Acta Geophysica

2014

tom Vol. 62, no. 6

1283--1309

A detailed investigation of microseismicity and fault plane solutions are used to determine the current tectonic activity of the prominent zone of seismicity near Samos Island and Kusadasi Bay. The activation of fault populations in this complex strike-slip and normal faulting system was investigated by using several thousand accurate earthquake locations obtained by applying a double-difference location method and waveform cross-correlation, appropriate for areas with relatively small seismogenic structures. The fault plane solutions, determined by both moment tensor waveform inversions and P-wave first motion polarities, reveal a clear NS trending extension direction, for strike slip, oblique normal and normal faults. The geometry of each segment is quite simple and indicates planar dislocations gently dipping with an average dip of 40-45°, maintaining a constant dip through the entire seismogenic layer, down to 15 km depth.

Multi-disciplinary earthquake researches in Western Turkey: Hints to select sites to study geochemical transients associated to seismicity

59%

Inan S. , Ertekin K. , Seyis C. , Simsek S. , Kulak F. , Dikbas A. , Tan O. , Ergintav S. , Cakmak R. , Yoruk A. , Cergel M. , Yakan H. , Karakus H. , Saatcilar R. , Akcig Z. , Iravul Y. , Tuzel B.

Acta Geophysica

2010

tom Vol. 58, no. 5

767-813

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.