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Gas and seismicity within the Istanbul seismic gap

Gas and seismicity within the Istanbul seismic gap
Gas and seismicity within the Istanbul seismic gap
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.
2045-2322
Géli, L.
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Henry, P.
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Grall, C.
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Tary, J.-B.
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Lomax, A.
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Batsi, E.
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Riboulot, V.
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Cros, E.
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Gürbüz, C.
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Işık, S.E.
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Le Pichon, X.
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Ruffine, L.
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Dupré, S.
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Thomas, Y.
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Kalafat, D.
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Bayrakci, G.
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Coutellier, Q.
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Regnier, T.
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Westbrook, G.
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Saritas, H.
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Çifçi, G.
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Çağatay, M.N.
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Özeren, M.S.
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Görür, N.
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Tryon, M.
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Bohnhoff, M.
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Gasperini, L.
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Klingelhoefer, F.
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Scalabrin, C.
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Augustin, J.-M.
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Embriaco, D.
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Marinaro, G.
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Frugoni, F.
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Monna, S.
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Etiope, G.
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Favali, P.
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Géli, L.
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Henry, P.
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Lomax, A.
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Batsi, E.
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Riboulot, V.
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Cros, E.
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Gürbüz, C.
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Işık, S.E.
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Sengör, A.M.C.
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Ruffine, L.
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Dupré, S.
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Kalafat, D.
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Bayrakci, G.
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Coutellier, Q.
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Regnier, T.
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Westbrook, G.
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Saritas, H.
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Çifçi, G.
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Çağatay, M.N.
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Özeren, M.S.
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Görür, N.
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Tryon, M.
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Bohnhoff, M.
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Gasperini, L.
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Klingelhoefer, F.
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Scalabrin, C.
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Augustin, J.-M.
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Embriaco, D.
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Marinaro, G.
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Frugoni, F.
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Monna, S.
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Etiope, G.
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Favali, P.
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Bécel, A.
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Géli, 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. Scientific Reports, 8 (1), [6819]. (doi:10.1038/s41598-018-23536-7).

Record type: Article

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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Accepted/In Press date: 6 March 2018
e-pub ahead of print date: 1 May 2018
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Identifiers

Local EPrints ID: 420914
URI: http://eprints.soton.ac.uk/id/eprint/420914
DOI: doi:10.1038/s41598-018-23536-7
ISSN: 2045-2322
PURE UUID: eaaac992-aa33-4592-868f-da65238d06c5

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Date deposited: 18 May 2018 16:30
Last modified: 15 Mar 2024 19:55

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Contributors

Author: L. Géli
Author: P. Henry
Author: C. Grall
Author: J.-B. Tary
Author: A. Lomax
Author: E. Batsi
Author: V. Riboulot
Author: E. Cros
Author: C. Gürbüz
Author: S.E. Işık
Author: A.M.C. Sengör
Author: X. Le Pichon
Author: L. Ruffine
Author: S. Dupré
Author: Y. Thomas
Author: D. Kalafat
Author: G. Bayrakci
Author: Q. Coutellier
Author: T. Regnier
Author: G. Westbrook
Author: H. Saritas
Author: G. Çifçi
Author: M.N. Çağatay
Author: M.S. Özeren
Author: N. Görür
Author: M. Tryon
Author: M. Bohnhoff
Author: L. Gasperini
Author: F. Klingelhoefer
Author: C. Scalabrin
Author: J.-M. Augustin
Author: D. Embriaco
Author: G. Marinaro
Author: F. Frugoni
Author: S. Monna
Author: G. Etiope
Author: P. Favali
Author: A. Bécel

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