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Determination of the 30-year creep trend on the Ismetpaşa segment of the North Anatolian Fault using an old geodetic network

Abstract

The Ismetpaşa segment of the North Anatolian Fault was ruptured during both the 1944 (M w = 7.2) Gerede and 1951 (M w = 6.9) Kurşunlu earthquakes. The field studies carried out in the aftermath of these two major earthquakes showed that the Ismetpaşa segment had experienced a creep movement. To monitor the surface creep, a geodetic network with six control points was established on the segment. This network was observed three times—in 1972, 1982 and 1992. Based on our evaluations of those observations, the creep on the segment was geodetically determined to be 1.02 cm/year (1972–1982) and 0.93 cm/year (1982–1992) respectively. In 1999, the North Anatolian Fault experienced two major shocks—the M w = 7.4 Gölcük and M w = 7.2 Düzce earthquakes—both on the western part of the Ismetpaşa fault. Using the global positioning system, our surveying team observed the network one more time in 2002 to assess whether these earthquakes affected the creep of the Ismetpaşa segment, or not. The evaluation of the observations revealed a creep of 0.78 cm/year for the period 1992–2002. This result reveals that the creep of the segment has decreased in a linear fashion between 1972 and 2002 and that it had not been triggered by the Gölcük and Düzce earthquakes.

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Correspondence to H. S. Kutoglu.

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Kutoglu, H.S., Akcin, H. Determination of the 30-year creep trend on the Ismetpaşa segment of the North Anatolian Fault using an old geodetic network. Earth Planet Sp 58, 937–942 (2006). https://doi.org/10.1186/BF03352598

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Key words

  • Crustal movement
  • earthquake
  • geodetic networks
  • geodetic surveys