Articles | Volume 10, issue 12
Nat. Hazards Earth Syst. Sci., 10, 2653–2657, 2010
https://doi.org/10.5194/nhess-10-2653-2010
Nat. Hazards Earth Syst. Sci., 10, 2653–2657, 2010
https://doi.org/10.5194/nhess-10-2653-2010

  21 Dec 2010

21 Dec 2010

Relaxation on the Ismetpasa segment of the North Anatolian Fault after the Golcuk Mw = 7.4 and Duzce Mw = 7.2 shocks

H. S. Kutoglu1, H. Akcin1, O. Gundogdu2, K. S. Gormus1, and E. Koksal1 H. S. Kutoglu et al.
  • 1Zonguldak Karaelmas University, Department of Geodesy and Photogrammetry, Hazard Monitoring and Research Laboratory, 67100, Zonguldak, Turkey
  • 2Istanbul University, Department of Geophysics, Istanbul, Turkey

Abstract. The Ismetpasa segment of the North Anatolian Fault (NAF) is a rare place where aseismic fault slip (creep) has been observed. Its creep behaviour has been monitored using different observation methods since the 1950s. The findings obtained from the studies until 1990s showed that the creep rate exponentially decreased before the major shocks in 1999, Golcuk (Mw = 7.4) and Duzce (Mw = 7.2). After these shocks, three GPS periods observation in 2002, 2007 and 2008 were carried out on the geodetic network established around the segment. The evaluations of these observations showed that the creep behaviour relaxed after the major earthquakes. This result demonstrates that the creep behaviour of the Ismetpasa segment might be a warning before future major earthquakes.

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