Interseismic strain build-up on the submarine North Anatolian Fault offshore Istanbul

Lange, Dietrich, Kopp, Heidrun, Royer, Jean-Yves, Henry, Pierre, Çakir, Ziyadin, Petersen, Florian, Sakic, Pierre, Ballu, Valerie, Bialas, Jörg, Özeren, Mehmet Sinan, Ergintav, Semih and Géli, Louis (2019) Interseismic strain build-up on the submarine North Anatolian Fault offshore Istanbul Nature Communications, 10 (Article number 3006). DOI 10.1038/s41467-019-11016-z.

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Supplementary data:

Abstract

Using offshore geodetic observations, we show that a segment of the North Anatolian Fault in
the central Sea of Marmara is locked and therefore accumulating strain. The strain accumulation
along this fault segment was previously extrapolated from onshore observations or
inferred from the absence of seismicity, but both methods could not distinguish between fully
locked or fully creeping fault behavior. A network of acoustic transponders measured crustal
deformation with mm-precision on the seafloor for 2.5 years and did not detect any significant
fault displacement. Absence of deformation together with sparse seismicity monitored
by ocean bottom seismometers indicates complete fault locking to at least 3 km depth
and presumably into the crystalline basement. The slip-deficit of at least 4m since the last
known rupture in 1766 is equivalent to an earthquake of magnitude 7.1 to 7.4 in the Sea of
Marmara offshore metropolitan Istanbul.

Document Type: Article
Additional Information: Data availability The geodetic data that support the findings of this study can be downloaded through the data repository PANGEA [G-stations, data https://doi.org/10.1594/PANGAEA.900275] and through SEANOE [F-stations, data https://doi.org/10.17882/59750]. The phase picks from the onshore seismological data is from KOERI (downloaded 15 June 2018). OBS data can be requested from the corresponding author.
Research affiliation: IFREMER
GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1038/s41467-019-11016-z
ISSN: 2041-1723
Related URLs:
Projects: MAREGAMI, Tübitak
Date Deposited: 09 Jul 2019 06:09
Last Modified: 10 Jul 2019 09:58
URI: http://eprints.uni-kiel.de/id/eprint/47140

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