Gas and seismicity within the Istanbul seismic gap

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

doi:10.1038/s41598-018-23536-7

Gas and seismicity within the Istanbul seismic gap

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

^*Corresponding author for this work

Eurasia Institute of Earth Sciences

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

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, 25^th 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.

Original language	English
Article number	6819
Journal	Scientific Reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-23536-7
Publication status	Published - 1 Dec 2018

Bibliographical note

Publisher Copyright:
© 2018 The Author(s).

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Géli, L., Henry, P., Grall, C., Tary, J. B., Lomax, A., Batsi, E., Riboulot, V., Cros, E., Gürbüz, C., Işlk, S. E., Sengör, A. M. C., Le Pichon, X., Ruffine, L., Dupré, S., Thomas, Y., Kalafat, D., Bayrakci, G., Coutellier, Q., Regnier, T., ... Bécel, A. (2018). Gas and seismicity within the Istanbul seismic gap. Scientific Reports, 8(1), Article 6819. https://doi.org/10.1038/s41598-018-23536-7

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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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Géli, L, Henry, P, Grall, C, Tary, JB, Lomax, A, Batsi, E, Riboulot, V, Cros, E, Gürbüz, C, Işlk, SE, Sengör, AMC, Le Pichon, X, Ruffine, L, Dupré, S, Thomas, Y, Kalafat, D, Bayrakci, G, Coutellier, Q, Regnier, T, Westbrook, G, Saritas, H, Çifçi, G, Çaǧatay, MN, Özeren, MS, Görür, N, Tryon, M, Bohnhoff, M, Gasperini, L, Klingelhoefer, F, Scalabrin, C, Augustin, JM, Embriaco, D, Marinaro, G, Frugoni, F, Monna, S, Etiope, G, Favali, P & Bécel, A 2018, 'Gas and seismicity within the Istanbul seismic gap', Scientific Reports, vol. 8, no. 1, 6819. https://doi.org/10.1038/s41598-018-23536-7

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AU - Géli, L.

AU - Henry, P.

AU - Grall, C.

AU - Tary, J. B.

AU - Lomax, A.

AU - Batsi, E.

AU - Riboulot, V.

AU - Cros, E.

AU - Gürbüz, C.

AU - Işlk, S. E.

AU - Sengör, A. M.C.

AU - Le Pichon, X.

AU - Ruffine, L.

AU - Dupré, S.

AU - Thomas, Y.

AU - Kalafat, D.

AU - Bayrakci, G.

AU - Coutellier, Q.

AU - Regnier, T.

AU - Westbrook, G.

AU - Saritas, H.

AU - Çifçi, G.

AU - Çaǧatay, M. N.

AU - Özeren, M. S.

AU - Görür, N.

AU - Tryon, M.

AU - Bohnhoff, M.

AU - Gasperini, L.

AU - Klingelhoefer, F.

AU - Scalabrin, C.

AU - Augustin, J. M.

AU - Embriaco, D.

AU - Marinaro, G.

AU - Frugoni, F.

AU - Monna, S.

AU - Etiope, G.

AU - Favali, P.

AU - Bécel, A.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - 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.

AB - 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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VL - 8

JO - Scientific Reports

JF - Scientific Reports

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ER -

Gas and seismicity within the Istanbul seismic gap

Abstract

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