Asperity along the North Anatolian Fault imaged by magnetotellurics at Düzce, Turkey

The magnetotelluric (MT) method has been applied to show resistivity variations in the vicinity of the epicenter of the 1999 Düzce earthquake ( M w = 7.2) where a large rupture velocity difference was seen between the western and eastern parts of the epicenter. MT data for frequencies ranging betwee...

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Published in:Earth, planets, and space planets, and space, 2009-01, Vol.61 (7), p.871-884
Main Authors: Kaya, Tulay, Tank, S. Bülent, Tunçer, M. Kemal, Rokoityansky, I. Igor, Tolak, Elif, Savchenko, Timur
Format: Article
Language:English
Subjects:
Cosmochemistry. Extraterrestrial geology
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Exact sciences and technology
Geology
Geophysics/Geodesy
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description The magnetotelluric (MT) method has been applied to show resistivity variations in the vicinity of the epicenter of the 1999 Düzce earthquake ( M w = 7.2) where a large rupture velocity difference was seen between the western and eastern parts of the epicenter. MT data for frequencies ranging between 320 and 0.0005 Hz were acquired along two parallel profiles to the west and the east of Düzce earthquake’s epicenter. Both profiles crossed the Düzce basin and the Düzce fault in the north and the North Anatolian Fault (NAF) in the south. MT data analysis shows almost two-dimensionality in the region, at the depth starting from 2–3 km beneath the surface. According to two-dimensional MT modeling, a higher resistive layer extends beneath the eastern side of Düzce earthquake epicenter, compared with the western side. This resistivity structure correlates well with the aftershock distribution of the Düzce earthquake.
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subjects Cosmochemistry. Extraterrestrial geology
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Exact sciences and technology
Geology
Geophysics/Geodesy
title Asperity along the North Anatolian Fault imaged by magnetotellurics at Düzce, Turkey
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