Rupture process of the 1999 Mw 7.1 duzce earthquake from joint analysis of SPOT, GPS, InSAR, strong-motion, and teleseismic data: A supershear rupture with variable rupture velocity

A. Ozgun Konca, Sebastien Leprince, Jean Philippe Avouac, Don V. Helmberger

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

We analyze the rupture process of the 1999 Mw 7.1 Duzce earthquake using seismological, remote sensing, and geodetic data. Ground deformation mea-sured from the subpixel cross correlation of Satellite Pour l'Observation de la Terre (SPOT) images reveals a 55 km long fault trace and smooth surface-slip distribution peaking at 3.5-4 m. The westernmost segment overlaps for over 10 km with ruptures from the Mw 7.4 Izmit earthquake. The 15 km long easternmost segment, which cuts across mountainous topography, had not been reported previously. We determine a well-constrained source model using a four-segment fault geometry using constraints on surface fault slip and inverting Global Positioning System and Interferometric Synthetic Aperture Radar data along with strong-motion records. Our results show that some variability of the rupture velocity and an eastward supershear velocity are required to fit the strong-motion data. The rise time, up to 6 sec, correlates with cumulative slip, suggesting a sliding velocity of about 1 m/sec. The source model predicts teleseismic waveforms well, although early by 2 sec. This time shift is prob-ably due to the weak beginning of the earthquake that is not observable at teleseismic distances. Strong-motion records are relatively well predicted from a source model derived from the teleseismic data using the fault geometry derived from the satellite images. This study demonstrates the benefit of using accurate fault geometries to determine finite-fault source models.

Original languageEnglish
Pages (from-to)267-288
Number of pages22
JournalBulletin of the Seismological Society of America
Volume100
Issue number1
DOIs
Publication statusPublished - 1 Feb 2010

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