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Scientific Drilling The open-access ICDP and IODP journal

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Sci. Dril., 22, 19-28, 2017
https://doi.org/10.5194/sd-22-19-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Progress report
31 May 2017
GONAF – the borehole Geophysical Observatory at the North Anatolian Fault in the eastern Sea of Marmara
Marco Bohnhoff1,2, Georg Dresen1, Ulubey Ceken3, Filiz Tuba Kadirioglu3, Recai Feyiz Kartal3, Tugbay Kilic3, Murat Nurlu3, Kenan Yanik3, Digdem Acarel1, Fatih Bulut1, Hisao Ito4, Wade Johnson5, Peter Eric Malin1, and Dave Mencin5 1GFZ German Research Centre for Geosciences, Section 4.2 “Geomechanics and Rheology”, Potsdam, 14473, Germany
2Free University Berlin, Department of Earth Sciences, Berlin, 12249, Germany
3AFAD Disaster and Emergency Management Presidency, Earthquake Department Ankara, 06510, Turkey
4Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, 236-0001, Japan
5UNAVCO, Boulder, Colorado 80301, USA
Abstract. The Marmara section of the North Anatolian Fault Zone (NAFZ) runs under water and is located less than 20 km from the 15-million-person population center of Istanbul in its eastern portion. Based on historical seismicity data, recurrence times forecast an impending magnitude M>7 earthquake for this region. The permanent GONAF (Geophysical Observatory at the North Anatolian Fault) has been installed around this section to help capture the seismic and strain activity preceding, during, and after such an anticipated event.

Citation: Bohnhoff, M., Dresen, G., Ceken, U., Kadirioglu, F. T., Kartal, R. F., Kilic, T., Nurlu, M., Yanik, K., Acarel, D., Bulut, F., Ito, H., Johnson, W., Malin, P. E., and Mencin, D.: GONAF – the borehole Geophysical Observatory at the North Anatolian Fault in the eastern Sea of Marmara, Sci. Dril., 22, 19-28, https://doi.org/10.5194/sd-22-19-2017, 2017.
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GONAF (Geophysical Observatory at the North Anatolian Fault) has been installed around the eastern Sea of Marmara section where a M>7 earthquake is pending to capture the seismic and strain activity preceding, during, and after such an anticipated event. GONAF is currently comprised of seven 300 m deep vertical seismic profiling stations and four collocated 100 m deep borehole strain meters. GONAF is the first ICDP-driven project with a primary focus on long-term fault-zone monitoring.
GONAF (Geophysical Observatory at the North Anatolian Fault) has been installed around the...
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