Articles | Volume 22
https://doi.org/10.5194/sd-22-19-2017
https://doi.org/10.5194/sd-22-19-2017
Progress report
 | 
31 May 2017
Progress report |  | 31 May 2017

GONAF – the borehole Geophysical Observatory at the North Anatolian Fault in the eastern Sea of Marmara

Marco Bohnhoff, Georg Dresen, Ulubey Ceken, Filiz Tuba Kadirioglu, Recai Feyiz Kartal, Tugbay Kilic, Murat Nurlu, Kenan Yanik, Digdem Acarel, Fatih Bulut, Hisao Ito, Wade Johnson, Peter Eric Malin, and Dave Mencin

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.

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Short summary
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.