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Extended Nucleation of the 1999 Mw 7.6 Izmit Earthquake

Michel Bouchon 1 Hayrullah Karabulut 2 Mustafa Aktar 2 Serdar Özalaybey 3 Jean Schmittbuhl 4 Marie-Paule Bouin 5
1 Mécanique des failles
ISTerre - Institut des Sciences de la Terre
2 KOERI - Kandilli Observatory and Earthquake Research Institute
3 Earth and Marine Sciences Research Institute [Gebze]
4 IPGS-Sismologie - Sismologie (IPGS)
IPGS - Institut de physique du globe de Strasbourg
5 Observatoire Volcanologique de Guadeloupe
Abstract : Laboratory and theoretical studies suggest that earthquakes are preceded by a phase of developing slip instability in which the fault slips slowly before accelerating to dynamic rupture. We report here that one of the best-recorded large earthquakes to date, the 1999 moment magnitude (Mw) 7.6 Izmit (Turkey) earthquake, was preceded by a seismic signal of long duration that originated from the hypocenter. The signal consisted of a succession of repetitive seismic bursts, accelerating with time, and increased low-frequency seismic noise. These observations show that the earthquake was preceded for 44 minutes by a phase of slow slip occurring at the base of the brittle crust. This slip accelerated slowly initially, and then rapidly accelerated in the 2 minutes preceding the earthquake. [ABSTRACT FROM AUTHOR]
Keywords : Nucleation seismology geology faults Izmit Turkey
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https://hal-insu.archives-ouvertes.fr/insu-00679411
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Submitted on : Thursday, March 15, 2012 - 3:43:55 PM
Last modification on : Monday, May 9, 2022 - 11:58:07 AM

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Michel Bouchon, Hayrullah Karabulut, Mustafa Aktar, Serdar Özalaybey, Jean Schmittbuhl, et al.. Extended Nucleation of the 1999 Mw 7.6 Izmit Earthquake. Science, American Association for the Advancement of Science (AAAS), 2011, 331 (6019), pp.877-880. ⟨10.1126/science.1197341⟩. ⟨insu-00679411⟩

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