Gas and seismicity within the Istanbul seismic gap

Type Article
Date 2018-05
Language English
Author(s) Geli LouisORCID1, Henry P.2, Grall Celine2, 3, Tary Jean-Baptiste1, 4, Lomax A.5, Batsi Evangelia1, Riboulot VincentORCID1, Cros Estelle1, Gurbuz C.6, 7, Isik S. E.6, 7, Sengor A. M. C.8, Le Pichon X.2, Ruffine Livio1, Dupre StephanieORCID1, Thomas Yannick1, Kalafat D.6, 7, Bayrakci G.1, 9, Coutellier Q.1, Regnier Thibaut1, Westbrook Graham1, 10, Saritas H.11, 12, Cifci G.12, Cagatay M. N.8, Ozeren M. S.8, Gorur N.8, Tryon M.9, Bohnhoff M.13, 14, Gasperini L.15, Klingelhoefer FraukeORCID1, Scalabrin CarlaORCID1, Augustin Jean-Marie1, Embriaco D.16, Marinaro G.16, Frugoni F.16, Monna S.16, Etiope G.16, 17, Favali P.16, Becel A.3
Affiliation(s) 1 : IFREMER, Dept Ressources Phys & Ecosyst Fond Mer REM, F-29280 Plouzane, France.
2 : Aix Marseille Univ, CEREGE, CNRS, IRD,INRA,Coll France, Aix Marseille, France.
3 : Lamont Doherty Earth Observ, Palisades, NY USA.
4 : Univ Los Andes, Bogota, Colombia.
5 : ALomax Sci, F-06370 Mouans Sartoux, France.
6 : Bogazici Univ, Kandilli Observ, Istanbul, Turkey.
7 : Bogazici Univ, Earthquake Res Inst, Istanbul, Turkey.
8 : Istanbul Tech Univ, Istanbul, Turkey.
9 : Natl Oceanog Ctr, Ocean & Earth Sci, Southampton, Hants, England.
10 : Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England.
11 : MTA, Mineral Res & Explorat Gen Directorate, Ankara, Turkey.
12 : Dokuz Eyiul Univ, Inst Marine Sci & Technol, Izmir, Turkey.
13 : German Ctr Geosci GFZ, Helmholtz Ctr Potsdam, Sect Geomech & Rheol 4 2, D-14473 Potsdam, Germany.
14 : Free Univ Berlin, Dept Earth Sci, Malteser Str 74-100, D-12249 Berlin, Germany.
15 : ISMAR CNR, Inst Marine Sci, Bologna, Italy.
16 : INGV, Rome, Italy.
17 : Babes Bolyai Univ, Fac Environm Sci & Engn, Cluj Napoca, Romania.
Source Scientific Reports (2045-2322) (Nature Publishing Group), 2018-05 , Vol. 8 , N. 1 , P. 6819 (11p.)
DOI 10.1038/s41598-018-23536-7
WOS© Times Cited 7
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.

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Geli Louis, Henry P., Grall Celine, Tary Jean-Baptiste, Lomax A., Batsi Evangelia, Riboulot Vincent, Cros Estelle, Gurbuz C., Isik S. E., Sengor A. M. C., Le Pichon X., Ruffine Livio, Dupre Stephanie, Thomas Yannick, Kalafat D., Bayrakci G., Coutellier Q., Regnier Thibaut, Westbrook Graham, Saritas H., Cifci G., Cagatay M. N., Ozeren M. S., Gorur N., Tryon M., Bohnhoff M., Gasperini L., Klingelhoefer Frauke, Scalabrin Carla, Augustin Jean-Marie, Embriaco D., Marinaro G., Frugoni F., Monna S., Etiope G., Favali P., Becel A. (2018). Gas and seismicity within the Istanbul seismic gap. Scientific Reports, 8(1), 6819 (11p.). Publisher's official version : https://doi.org/10.1038/s41598-018-23536-7 , Open Access version : https://archimer.ifremer.fr/doc/00439/55072/