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Seismic imaging of the 1999 Izmit (Turkey) Rupture inferred from the near‐fault recordings

Abstract : We use near-fault accelerograms to infer the space-time history of rupture on the fault during the Izmit earthquake. The records show that the ground displacement and velocity near the fault were surprisingly simple. Rupture propagated toward the west at a velocity of about 3 km/s, and toward the east at a remarkably high average velocity of 4.7 km/s over a distance of about 45 km before decelerating to about 3.1 km/s on the eastern segment. Slip on the fault is particularly large down to a depth of 20 km on the central portion of the fault where it reaches about 7 m. Slip is large also below 10 km on the eastern fault segment, and this may have contributed to the loading of shear stress on the Diizce fault. On the western fault segment, large slip seems confined to shallow depths. is located very close to ARC, and the ground velocities there display waveforms and amplitudes similar to those at ARC. The digital records at ARC are, however, of much better quality than the analog records at GBZ, and, for this reason, we shall use ARC as our modeling station. The other station that we did not use is YPT because records there are more complicated and have a longer duration than records at ARC and SKR, located further from the epicenter. This complexity suggests that at this station the records are more affected by the shallow crustal structure below the site or between the station and the fault.
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Michel Bouchon, Nafi Toksöz, Hayrullah Karabulut, Marie-Paule Bouin, Michel Dietrich, et al.. Seismic imaging of the 1999 Izmit (Turkey) Rupture inferred from the near‐fault recordings. Geophysical Research Letters, 2000, 27 (18), pp.3013-3016. ⟨10.1029/2000GL011761⟩. ⟨insu-02165141⟩



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