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Postseismic Deformation near the zmit Earthquake (17 August 1999, M 7.5) Rupture Zone

The Scientific and Technical Research Council of Turkey (TÜBTAK)
MRC, Earth and Marine Sciences Research Institute
Gebze 41470
Turkey
semih.Ergintav{at}posta.mam.gov.tr
(E.S., R.Ç., A.B.)
Department of Earth and Planetary Science
301 McCone Hall
University of California, Berkeley
Berkeley, California 94720
(R.B.)
Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology
Cambridge, Massachusetts 02142
(S.M., R.E.R.)
General Command of Mapping
Cebeci
Ankara, Turkey
(O.L.)
Istanbul Technical University
Eurasia Earth Science Institute
Ayazaga
Istanbul, Turkey
(A.B.)
Kandilli Observatory and Earthquake Research Institute
Bogaziçi University
Istanbul, Turkey
(H.Ö.)

Manuscript received 22 September 2000.

We present and interpret the results of postseismic, Global Positioning System monitoring of the first 298 days following the 17 August 1999 zmit earthquake. Whereas the data suggest some spatial and temporal complexity in the postseismic motions, the overall pattern can be characterized by time-dependent relaxation functions and suggests exponential decay with an estimated 57-day relaxation time. The very rapid deformation during the first few weeks following the mainshock suggests rapid afterslip on and below the coseismic rupture segments. The exponential decay of the postseismic deformations through the end of the observation period suggests contributions from the lower crustal viscoelastic relaxation.

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