Seismic studies from small aperture accelerometric network in Izmir metropolitan city, Turkey

This study deals with the results obtained from IzmirNet local strong-motion network installed in Izmir metropolitan city. Data were interpreted in terms of engineering seismology and earthquake engineering, correlation of noise using accelerometric array, seismological and seismotectonics studies. Site characteristics reveal an amplification factor equal or greater than 6.0 for a dominant frequency interval between 0.6-1.5 Hz on alluvial deposits observed mostly around the Izmir Gulf. Bigger frequencies and less amplifications were also detected for limestones and andesitic volcanic units. Recent study about cross-correlation of noise exposes underground velocity structure by using station-pairs methods. Low group velocities present at the east of the gulf where thick Quaternary-aged deposits exhibit over there. City was under high seismic risk according to the locations of recorded events by IzmirNet. Izmir, Orhanli-Tuzla and Seferihisar faults are candidate to produce a destructive earthquake in the future according to the present seismic activity and focal mechanisms solutions. Stress tensor study illuminates E-W aligned faulting under the N-S extension regime.