Gas and seismicity within the Istanbul seismic gap.

Geli, L., Henry, P., Grall, C., Tary, J.-B., Lomax, A., Batsi, E., Riboulot, V., Cros, E., Gürbüz, C., Işık, S. E., Sengör, A. M. C., Le Pichon, X., Ruffine, L., Dupré, S., Thomas, Y., Kalafat, D., Bayrakci, G., Coutellier, Q., Regnier, T., Westbrook, G., Saritas, H., Çifçi, G., Çağatay, M. N., Özeren, M. S., Görür, N., Tryon, M., Bohnhoff, M., Gasperini, L., Klingelhoefer, F., Scalabrin, C., Augustin, J.-M., Embriaco, D., Marinaro, G., Frugoni, F., Monna, S., Etiope, G., Favali, P. and Bécel, A. (2018) Gas and seismicity within the Istanbul seismic gap. Open Access Scientific Reports, 8 (Article number 6819). DOI 10.1038/s41598-018-23536-7.

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Abstract

Understanding micro-seismicity is a critical question for earthquake hazard assessment. Since the devastating earthquakes of Izmit and Duzce in 1999, the seismicity along the submerged section of North Anatolian Fault within the Sea of Marmara (comprising the “Istanbul seismic gap”) has been extensively studied in order to infer its mechanical behaviour (creeping vs locked). So far, the seismicity has been interpreted only in terms of being tectonic-driven, although the Main Marmara Fault (MMF) is known to strike across multiple hydrocarbon gas sources. Here, we show that a large number of the aftershocks that followed the M 5.1 earthquake of July, 25th 2011 in the western Sea of Marmara, occurred within a zone of gas overpressuring in the 1.5–5 km depth range, from where pressurized gas is expected to migrate along the MMF, up to the surface sediment layers. Hence, gas-related processes should also be considered for a complete interpretation of the micro-seismicity (~M < 3) within the Istanbul offshore domain.

Document Type: Article
Keywords: Gas, seismicity, Istanbul
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41598-018-23536-7
ISSN: 2045-2322
Projects: FLOWS
Date Deposited: 28 May 2018 14:01
Last Modified: 17 Jan 2019 13:35
URI: http://oceanrep.geomar.de/id/eprint/43159

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