Konca, A. Ozgun and Leprince, Sébastien and Avouac , Jean-Philippe and Helmberger, Don V. (2010) Rupture Process of the 1999 M_w 7.1 Duzce Earthquake from Joint Analysis of SPOT, GPS, InSAR, Strong-Motion, and Teleseismic Data: A Supershear Rupture with Variable Rupture Velocity. Bulletin of the Seismological Society of America, 100 (1). pp. 267-288. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20100225-110542388
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We analyze the rupture process of the 1999 M_w 7.1 Duzce earthquake using seismological, remote sensing, and geodetic data. Ground deformation measured 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 M_w 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 probably 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.
|Additional Information:||© 2010 Seismological Society of America. This study was supported in part by National Science Foundation (NSF) grant EAR 0636097 and by the Gordon and Betty Moore Foundation. This is Caltech Tectonic Observatory contribution no. 100. We would like to thank Stefano Pucci, Michel Bouchon, Gulum Birgoren, Ziyaeddin Cakir, Roland Bürgmann, and Rolando Armijo for providing the data. We also would like to thank Ares Rosakis, Nadia Lapusta, and Jean Paul Ampuero for useful discussions. This manuscript has benefited from helpful suggestions from our reviewers, David Wald and one anonymous reviewer, and editor Roland Bürgmann. Online Material: Tables of best-fitting dip angles and rupture velocities, and figures showing mutual consistency of derived displacements fields, additional slip and rise-time models, and teleseismic waveform fit.|
|Group:||Caltech Tectonics Observatory|
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|Official Citation:||Konca, A. Ozgun, Leprince, Sebastien, Avouac, Jean-Philippe, Helmberger, Don V. 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 Bulletin of the Seismological Society of America 2010 100: 267-288|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||05 Mar 2010 22:41|
|Last Modified:||26 Dec 2012 11:48|
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