TY - JOUR T1 - No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6 months of seafloor acoustic ranging A1 - Sakic,P. A1 - Piete,Helene A1 - Ballu,V. A1 - Royer,J. -Y. A1 - Kopp,H. A1 - Lange,D. A1 - Petersen,F. A1 - Ozeren,M. S. A1 - Ergintav,S. A1 - Geli,Louis A1 - Henry,P. A1 - Deschamps,Anne AD - Univ La Rochelle, Lab Littoral Environm & Soc, La Rochelle, France. AD - CNRS, La Rochelle, France. AD - Univ Brest, Lab Geosci Ocean, Plouzane, France. AD - CNRS, Plouzane, France. AD - GEOMAR Helmholtz Zentrum Ozeanforsch, Dynam Ozeanbodens FB4, Kiel, Germany. AD - Istanbul Tech Univ, Eurasian Inst Earth Sci, Istanbul, Turkey. AD - Bogazici Univ, Kandilli Observ, Istanbul, Turkey. AD - Bogazici Univ, Earthquake Res Inst, Dept Geodesy, Istanbul, Turkey. AD - Inst Carnot EDROME, Lab Aleas Geol & Dynam Sedimentaire, UR Geosci Marines, IFREMER, Plouzane, France. AD - Aix Marseille Univ, CEREGE, CNRS, IRD, Aix En Provence, France. AD - Coll France, Aix En Provence, France. UR - https://archimer.ifremer.fr/doc/00344/45513/ DO - 10.1002/2016GL069600 KW - seafloor geodesy KW - North Anatolian Fault KW - Marmara Sea KW - acoustic ranging N2 - The submarine Istanbul-Silivri fault segment, within 15 km of Istanbul, is the only portion of the North Anatolian Fault that has not ruptured in the last 250 years. We report first results of a seafloor acoustic ranging experiment to quantify current horizontal deformation along this segment and assess whether the segment is creeping aseismically or accumulating stress to be released in a future event. Ten transponders were installed to monitor length variations along 15 baselines. A joint least squares inversion for across-fault baseline changes, accounting for sound speed drift at each transponder, precludes fault displacement rates larger than a few millimeters per year during the 6 month observation period. Forward modeling shows that the data better fit a locked state or a very moderate surface creep—less than 6 mm/yr compared to a far-field slip rate of over 20 mm/yr—suggesting that the fault segment is currently accumulating stress. Y1 - 2016/07 PB - Amer Geophysical Union JF - Geophysical Research Letters SN - 0094-8276 VL - 43 IS - 13 SP - 6817 EP - 6825 ID - 45513 ER -