Identification of triggered earthquakes in the gulf of Gökova

Abstract

Triggering mechanism is described as the consequence of the stress transfer on the faults. Triggered earthquakes can either be close to the triggering one as well as far from it. The study done in this thesis is to search for the static and dynamic triggering effects in the Gulf of Gökova using three different catalogues. One of the catalogues is prepared within this study (July, 2007) and the others are from NEMC and USGS (2001-2009). Triggering effect due to local, regional and global earthquakes are considered. First, a high accuracy analysis is carried out using the catalogue produced within the framework of this thesis for a period of two months. Mean values of stress amplitudes with their variances and standard deviations are evaluated for each seismic station (BLCB, BODT, CETI, DALT, DAT, ELL, MLSB, OREN, TURG and YER). These stress variations in the Gulf are compared with the seismicity rates. Teleseismic events are seen to give signs of triggering. A second analysis is made using a catalogue of longer duration (2001-2009) but lower resolution (completeness, M>2.5). This second analysis also shows evidences for triggering by teleseismic events.