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| 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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| Royer, J. -y.; Chateau, R.; Dziak, R. P.; Bohnenstiehl, D. R.. |
| This paper presents the results from the Deflo-hydroacoustic experiment in the Southern Indian Ocean using three autonomous underwater hydrophones, complemented by two permanent hydroacoustic stations. The array monitored for 14 months, from November 2006 to December 2007, a 3000 x 3000 km wide area, encompassing large segments of the three Indian spreading ridges that meet at the Indian Triple Junction. A catalogue of 11 105 acoustic events is derived from the recorded data, of which 55 per cent are located from three hydrophones, 38 per cent from 4, 6 per cent from five and less than 1 per cent by six hydrophones. From a comparison with land-based seismic catalogues, the smallest detected earthquakes are m(b) 2.6 in size, the range of recorded magnitudes... |
| Tipo: Text |
Palavras-chave: Hydrogeophysics; Acoustic properties; Mid-ocean ridge processes; Indian Ocean. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00351/46249/46101.pdf |
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