Gas emissions and active tectonics within the submerged section of the North Anatolian Fault zone in the Sea of Marmara
|Author(s)||Geli Louis1, Henry P2, Zitter T2, Dupre Stephanie1, Tryon M3, Cagatay M4, de Lepinay B5, Le Pichon X2, Sengor A4, Gorur N4, Natalin B4, Ucarkus G4, Oezeren S4, Volker D6, Gasperini L7, Burnard P8, Bourlange S8|
|Affiliation(s)||1 : IFREMER, Dept Marine Geosci, F-29280 Plouzane, France.
2 : Chaire Geodynam Coll France, CEREGE, F-13545 Aix En Provence 04, France.
3 : Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA.
4 : Istanbul Tech Univ, Fac Mines, Dept Geol, TR-34469 Istanbul, Turkey.
5 : Univ Nice Sophia Antipolis, F-06560 Valbonne, France.
6 : IFM GEOMAR, D-24148 Kiel, Germany.
7 : CNR, ISMAR, I-40129 Bologna, Italy.
8 : CRPG, F-54501 Vandoeuvre Les Nancy, France.
|Source||Earth and Planetary Science Letters (0012-821X) (Elsevier), 2008-09 , Vol. 274 , N. 1-2 , P. 34-39|
|WOS© Times Cited||86|
|Keyword(s)||North Anatolian Fault, Marmara Sea, Gas emission, Fluids, Seismicity|
|Abstract||The submerged section of the North Anatolian fault within the Marmara Sea was investigated using acoustic techniques and submersible dives. Most gas emissions in the water column were found near the surface expression of known active faults. Gas emissions are unevenly distributed. The linear fault segment crossing the Central High and forming a seismic gap - as it has not ruptured since 1766, based on historical seismicity [Ambraseys, N.N., and Jackson, J.A., (2000), Seismicity of the Sea of Marmara (Turkey) since 1500, Geophys. J. Int., 141, (3), F1-F6. (doi:10.1046/j.1365-246x.2000.00137.x: Ambraseys, N., (2002), The seismic activity of the Marmara Region over the last 2000 years, Bull. Seism. Soc. Am., 92, 1-18; Parson, T., (2004), Recalculated probability of M >= 7 earthquakes beneath the Sea of Marmara, Turkey,J. Geophys. Res., 109, B05304, doi: 10.1029/2003JB002667: Pondard, N., Armijo, R., King, G.C.P., Meyer, B., Flerit, F, (2007), Fault interactions in the Sea of Marmara pull-apart (North Anatolian Fault): earthquake clustering and propagating earthquake sequences, Geophys. J. hit., 171, 1185-1197, doi: 10;1111/j.1365-246X.2007.03580.x] -, exhibits relatively less gas emissions than the adjacent segments. In the eastern Sea of Marmara, active gas emissions are also found above a buried transtensional fault zone [Carton, H., Singh, S.C., Hirn, A., Bazin, S., de Voogd, B., Vigner, A., Ricolleau, A., Cetin, S., Ocakoglu, N., Karakoc, F. and Sevilgen, V., (2007), Seismic imaging of the three-dimensional architecture of the Cmarcik Basin along the North Anatolian Fault,J. Geophys. Res., 180, B06101, doi:10.1029/2006JB004548; Okay, A.I., Kashlar-Ozcan, A., Imren, C., Boztepe-Guney, A., Demirbag, E., and Kuscu, I., (2000). Active faults and evolving strike-slip basins in the Sea of Marmara, northwest Turkey: a multichannel seismic reflection study, Tectonophysics, 321,189-218], which displayed micro-seismic activity after the 1999 events [Ozalabey, S., Ergin, M., Aktar, M., Tapirdamaz, C., Bicmen, F., Yoruk, A., (2002), The 1999 Izmit Earthquake Sequence in Turkey: seismological and tectonic aspects, Bull. Seism. Soc. Am., 92,376-386; Karabulut, H., Bouin, M.P., Bouchon, M., Dietrich, M., Cornou, C., Aktar, M., (2002), The seismicity in the Eastern Marmara Sea after the 17 August 1999 Izmit earthquake, Bull. Seismol. Soc. Am., 92, 387-393]. Remarkably, this zone of gas emission extends westward all along the southern edge of Cinarcik basin, well beyond the zone where 1999 aftershocks were observed. The long term monitoring of gas seeps could hence be highly valuable for the understanding of the evolution of the fluid-fault coupling processes during the earthquake cycle within the Marmara Sea.|