Details

Autor(en) / Beteiligte

• Sakic, P
• Piete, H
• Ballu, V
• Royer, J-Y
• Kopp, H
• Lange, D
• Petersen, F
• Ozeren, M S
• Ergintav, S
• Geli, L
• Henry, P
• Deschamps, A

Titel

No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6months of seafloor acoustic ranging

Ist Teil von

• Geophysical research letters, 2016-07, Vol.43 (13), p.6817-6825

Ort / Verlag

Washington: John Wiley & Sons, Inc

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• The submarine Istanbul-Silivri fault segment, within 15km of Istanbul, is the only portion of the North Anatolian Fault that has not ruptured in the last 250years. 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 6month observation period. Forward modeling shows that the data better fit a locked state or a very moderate surface creep--less than 6mm/yr compared to a far-field slip rate of over 20mm/yr--suggesting that the fault segment is currently accumulating stress.