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

Abstract : 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.
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https://hal-insu.archives-ouvertes.fr/insu-00680754
Contributor : Pascale Talour <>
Submitted on : Tuesday, March 20, 2012 - 10:05:02 AM
Last modification on : Wednesday, September 16, 2020 - 10:43:36 AM

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H. Karabulut, Jean Schmittbuhl, S. Özalaybey, Olivier Lengline, A. Kömeç-Mutlu, et al.. Evolution of the seismicity in the eastern Marmara Sea a decade before and after the 17 August 1999 Izmit earthquake. Tectonophysics, Elsevier, 2011, 510 (1-2), pp.17-27. ⟨10.1016/j.tecto.2011.07.009⟩. ⟨insu-00680754⟩

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