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Rupture process of the 1999 M (sub w) 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 and Don V. Helmberger
Rupture process of the 1999 M (sub 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 (February 2010) 100 (1): 267-288

Abstract

We analyze the rupture process of the 1999 M (sub 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 (sub 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.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 100
Serial Issue: 1
Title: Rupture process of the 1999 M (sub w) 7.1 Duzce earthquake from joint analysis of SPOT, GPS, InSar, strong-motion, and teleseismic data; a supershear rupture with variable rupture velocity
Affiliation: California Institute of Technology, Tectonics Observatory, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Pages: 267-288
Published: 201002
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 77
Accession Number: 2010-022491
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N40°30'00" - N40°45'00", E31°15'00" - E31°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201014
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