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No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6 months of seafloor acoustic ranging ArchiMer
Sakic, P.; Piete, Helene; Ballu, V.; Royer, J. -y.; Kopp, H.; Lange, D.; Petersen, F.; Ozeren, M. S.; Ergintav, S.; Geli, Louis; Henry, P.; Deschamps, Anne.
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...
Tipo: Text Palavras-chave: Seafloor geodesy; North Anatolian Fault; Marmara Sea; Acoustic ranging.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00344/45513/45067.pdf
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A Multi-Observation Least-Squares Inversion for GNSS-Acoustic Seafloor Positioning ArchiMer
Sakic, Pierre; Ballu, Valerie; Royer, Jean-yves.
Monitoring deformation on the seafloor is a major challenge for modern geodesy and a key to better understanding tectonic processes and assess related hazards. The extension of the geodetic networks offshore can be achieved by combining satellite positioning (GNSS) of a surface platform with acoustic ranging to seafloor transponders. This approach is called GNSS-Acoustic (GNSS-A). The scope of this work is to provide a tool to identify and quantify key points in the error budget of such experiment. For this purpose, we present a least-squares inversion method to determine the absolute position of a seafloor transponder array. Assuming the surface platform is accurately positioned by GNSS, the main observables are the two-way travel time in water between...
Tipo: Text Palavras-chave: Seafloor geodesy; Offshore geodesy; Absolute seafloor positioning; GNSS-Acoustic; Simulations; Least-squares inversion; Acoustic two-way-travel times; Depth differences; Baseline lengths.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00659/77080/78401.pdf
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