PUMA
Istituto di Scienze Marine     
Geli L., Henry P., Zitter T., Dupre S., Tryon M., Cagatay M. N., de Lepinay B. M., Le Pichon X., Sengor A. M. C., Gorur N., Natalin B., Ucarkus G., Oezeren S., Volker D., Gasperini L., Burnard P., Bourlange S. Gas emissions and active tectonics within the submerged section of the North Anatolian Fault zone in the Sea of Marmara. In: Earth and Planetary Science Letters, vol. 274 pp. 34 - 39. Elsevier Science Bv, 2008.
 
 
Abstract
(English)
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, 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, which displayed micro-seismic activity after the 1999 events. 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.
DOI: 10.1016/j.epsl.2008.06.047
Subject seismicity
fluids
gas emission
Marmara Sea
North Anatolian Fault


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