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Seismotectonics of western Turkey from high resolution earthquake relocations and moment tensor determinations
Author(s) -
Zhu Lupei,
Akyol Nihal,
Mitchell Brian J.,
Sozbilir Hasan
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl025842
Subject(s) - geology , seismology , graben , seismotectonics , strike slip tectonics , epicenter , fault plane , slip (aerodynamics) , echelon formation , hypocenter , fault (geology) , aftershock , induced seismicity , geodesy , tectonics , physics , thermodynamics
We have relocated 364 earthquakes in western Turkey between 2002 and 2003 using more than 45,000 accurate P and S differential travel‐times. We also have determined moment tensors for 71 of these earthquakes using their broadband regional waveforms. After relocation the events are highly concentrated in three clusters and delineate two nearly vertical faults. Their strikes agree with the strike of one of the fault planes of the averaged fault‐plane solution of the cluster, which allowed us to pick the true fault plane and the slip direction. We identified a NNW‐striking left‐lateral strike‐slip fault near Buldan that connects the Gediz graben in the north and the eastern end of the Buyuk Menderes graben in the south. The other right‐lateral strike‐slip fault near Izmir strikes ENE–WSW direction. Our results indicate that part of the N–S extension occurring in western Turkey is accommodated by strike‐slip faults and is accompanied by E–W shortening.