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The rupture process during the 1999 Duzce, Turkey, earthquake from joint inversion of teleseismic and strong-motion data



The rupture process during the 1999 Duzce, Turkey, earthquake from joint inversion of teleseismic and strong-motion data



Tectonophysics 391(1-4): 315-324



Teleseismic and strong-motion data are inverted to determine the rupture process during the November 1999 Duzce earthquake in NW Turkey. The fault geometry, rise time and rupture velocity are determined from the aftershock distribution and preliminary inversions of the teleseismic data. Joint inversion of the teleseismic and strong-motion data is then carried out for the slip distribution. We obtain the strike 264 degrees , dip 64 degrees , rake -172 degrees , seismic moment 5.0X10 (super 19) N m (M (sub w) 7.1), and average stress drop 7 MPa. This earthquake was characterized by bilateral fault rupture and asymmetric slip distribution. Two asperities (areas of large slip) are identified, the eastern one being 1.5 times larger than the western one. The derived slip distribution is consistent with the aftershock distribution, surface rupture and damage. The point of rupture initiation in this Duzce earthquake coincided with the eastern tip of the aftershock distribution of the August 1999 Izmit earthquake.

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Accession: 020438216

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DOI: 10.1016/j.tecto.2004.07.019


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