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

H. Karabulut 1 Jean Schmittbuhl 2 S. Özalaybey 3 Olivier Lengline 4 A. Kömeç-Mutlu 1 Virginie Durand 5 Michel Bouchon 5 G. Daniel 6, 7 M.P. Bouin 8
1 KOERI - Kandilli Observatory and Earthquake Research Institute
2 IPGS-Sismologie - Sismologie (IPGS)
IPGS - Institut de physique du globe de Strasbourg
3 Earth and Marine Sciences Research Institute [Gebze]
4 IPGS-GE - Géophysique expérimentale (IPGS)
IPGS - Institut de physique du globe de Strasbourg
5 Mécanique des failles
ISTerre - Institut des Sciences de la Terre
6 IPGS - Institut de physique du globe de Strasbourg
7 UFC - Université de Franche-Comté
8 Observatoire Volcanologique de Guadeloupe
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.
Keywords : Seismicity Stress transfer Seismic cluster Marmara Sea North Anatolian Fault
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Submitted on : Tuesday, March 20, 2012 - 10:05:02 AM
Last modification on : Monday, October 11, 2021 - 10:04:58 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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