Evolution of the seismicity in the eastern Marmara Sea a decade before and after the 17 August 1999 Izmit earthquake

• Published in: Tectonophysics 2011-09, Vol.510 (1), p.17-27
• Main Authors: Karabulut, H., Schmittbuhl, J., Özalaybey, S., Lengliné, O., Kömeç-Mutlu, A., Durand, V., Bouchon, M., Daniel, G., Bouin, M.P.
• Format: Article
• Language: English
• Subjects: Clusters; Delay; Earth Sciences; Evolution; Faults; Geomorphology; Marmara Sea; North Anatolian Fault; Sciences of the Universe; Segments; Seismic cluster; Seismic engineering; Seismic phenomena; Seismicity; Stress transfer
• ISSN: 0040-1951; 1879-3266
• DOI: 10.1016/j.tecto.2011.07.009

We review the long term evolution of seismicity in the eastern Marmara Sea over a decade, before and after the 1999 Mw 7.6 Izmit earthquake. We analyze large scale space-time variations of seismicity in the region and illustrate the impact of the recent large strike-slip earthquakes on the background activity composed of distinct pre-existing seismic clusters. Two types of aftershocks activity are observed: the first type of enhancement is on strike-slip fault segments (Izmit Fault, Princes Island section of the Main Marmara Fault, Gemlik Fault) immediately following the main shock and related to Coulomb stress transfer; the second type of enhancement is attached to extensional clusters (Yalova, Tuzla) with a few days delay in the onset of strong activation, probably related to pore pressure increase. We observe a fast decay of the activity on strike-slip segments and slower evolution of seismic clusters with extensional features. Two years after the Izmit earthquake, seismic activity returned to the pre-earthquake pattern with most of the activity occurring within extensional clusters. It appears that the influence of the last large strike-slip event on the spatial seismicity distribution in the eastern Marmara Sea is less significant than the effect of the long term regional extension. ► We review the long term evolution of seismicity in the eastern Marmara Sea. ► Time window is ten year before and after the 1999 Izmit earthquake. ► The trace of the NAF from the seismic activity is poor before and ten years after the main shock. ► Seismic clusters are shown to be maintained on the long term. ► Dynamic stress transfer related to the main shock weakly affects regional seismicity pattern.