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Science 1 September 2000:
Vol. 289. no. 5484, pp. 1519 - 1524
DOI: 10.1126/science.289.5484.1519
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Research Articles

Coseismic and Postseismic Fault Slip for the 17 August 1999, M = 7.5, Izmit, Turkey Earthquake

R. E. Reilinger,1*dagger S. Ergintav,2dagger R. Bürgmann,3dagger S. McClusky,1 O. Lenk,4 A. Barka,5 O. Gurkan,6 L. Hearn,1 K. L. Feigl,7 R. Cakmak,2 B. Aktug,4 H. Ozener,6 M. N. Töksoz1

We use Global Positioning System (GPS) observations and elastic half-space models to estimate the distribution of coseismic and postseismic slip along the Izmit earthquake rupture. Our results indicate that large coseismic slip (reaching 5.7 meters) is confined to the upper 10 kilometers of the crust, correlates with structurally distinct fault segments, and is relatively low near the hypocenter. Continued surface deformation during the first 75 days after the earthquake indicates an aseismic fault slip of as much as 0.43 meters on and below the coseismic rupture. These observations are consistent with a transition from unstable (episodic large earthquakes) to stable (fault creep) sliding at the base of the seismogenic zone.

1 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, E34, 42 Carleton Street, Cambridge, MA 02142, USA.
2 TUBITAK, Marmara Research Center, Earth Science Research Institute, Gebze 41470, Turkey.
3 Department of Earth and Planetary Science, 301 McCone Hall, University of California, Berkeley, Berkeley, CA 94720, USA.
4 General Command of Mapping, Cebece, Ankara, Turkey.
5 Istanbul Technical University, Eurasia Earth Science Institute, Ayazaga, Istanbul, Turkey.
6 Kandilli Observatory, Bogazici University, Istanbul, Turkey.
7 Department of Terrestrial and Planetary Dynamics (UMR 5562) Centre National de Recherche Scientifique, 14 ave. E. Belin 31400 Toulouse, France.
*   To whom correspondence should be addressed. E-mail: reilinge{at}erl.mit.edu

dagger    These authors contributed equally to the work.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)