Gas and seismicity within the Istanbul seismic gap
|Author(s)||Geli Louis1, Henry P.2, Grall Celine2, 3, Tary Jean-Baptiste1, 4, Lomax A.5, Batsi Evangelia1, Riboulot Vincent1, Cros Estelle1, Gurbuz C.6, 7, Isik S. E.6, 7, Sengor A. M. C.8, Le Pichon X.2, Ruffine Livio1, Dupre Stephanie1, 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 Frauke1, Scalabrin Carla1, 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.)|
|WOS© Times Cited||12|
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.