Abstract
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.
Highlights
The continental North Anatolian Fault Zone (NAFZ) spans some 1200 km, from eastern Anatolia to the northern Aegean Sea (e.g., Barka, 1992; Sengör et al, 2005; Bohnhoff et al, 2016a)
The recently implemented Geophysical Observatory at the North Anatolian Fault (GONAF) in northwestern Turkey aims at monitoring the eastern portion of the NAFZ below the Sea of Marmara
This section of the North Anatolian Fault is currently overdue for a M>7 earthquake and runs underwater at less than 20 km from the 15-million-person population center of Istanbul
Summary
The continental North Anatolian Fault Zone (NAFZ) spans some 1200 km, from eastern Anatolia to the northern Aegean Sea (e.g., Barka, 1992; Sengör et al, 2005; Bohnhoff et al, 2016a). The major event occurred in Erzincan, eastern Anatolia, in 1939, and was followed by a systematic westward propagation of earthquakes (Stein et al, 1997; Sengör et al, 2005) This sequence ended with the M7.4 ̇Izmit and M7.1 Düzce earthquakes in 1999, just east of the Sea of Marmara (Tibi et al, 2001; Barka et al, 2002; Bohnhoff et al, 2016b). We document our achievements in earthquake detection, waveform quality improvement, and detection of strain by using the downhole seismic arrays and strainmeters
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