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Deformation due to the 17 August 1999 Izmit, Turkey, earthquake measured from SPOT images

Michel, Rémi and Avouac, Jean-Philippe (2002) Deformation due to the 17 August 1999 Izmit, Turkey, earthquake measured from SPOT images. Journal of Geophysical Research B, 107 (B4). Art. No. 2062. ISSN 0148-0227. doi:10.1029/2000JB000102.

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The geometry of the ruptured areas and the coseismic slip distribution data are key to highlighting the behavior of seismic faults. This information is generally retrieved from field investigations and geodetic measurements or synthetic aperture radar (SAR) interferometry. Here we show that SPOT images can also be used to accurately map the fault zone and to determine the slip distribution by subpixel correlation of images acquired before and after an earthquake. The measured slip includes the contribution of possible distributed shear that might not be clearly expressed in surface ruptures and smoothes out possible along-strike variability due to near-surface fault complexities. We apply the technique to the M_s = 7.4, 1999, Izmit earthquake. Our results reveal a <100-m-wide and very linear fault zone that can be traced for 70 km from Gölcük to Akyazi, along which supershear rupture has been inferred. The obtained slip distribution compares well with the field measurements and is consistent with ground deformation measured at some distance from the fault zone using SAR images. Very little deformation was accommodated off the main fault plane. Maximum slip is observed near Sapanca lake at a small fault jog that has probably influenced rupture propagation.

Item Type:Article
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Avouac, Jean-Philippe0000-0002-3060-8442
Additional Information:© 2002 by the American Geophysical Union. Received 8 December 2000; revised 4 April 2001; accepted 31 August 2001; published 12 April 2002.
Group:Seismological Laboratory
Subject Keywords:earthquake, deformation, Izmit, offset
Issue or Number:B4
Record Number:CaltechAUTHORS:20120911-102105821
Persistent URL:
Official Citation:Michel, R., and J.-P. Avouac (2002), Deformation due to the 17 August 1999 Izmit, Turkey, earthquake measured from SPOT images, J. Geophys. Res., 107, 2062, doi:10.1029/2000JB000102
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33987
Deposited By: Tony Diaz
Deposited On:11 Sep 2012 20:31
Last Modified:09 Nov 2021 23:05

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