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


Sakic P., PIETE H., BALLU V., ROYER J. -. , KOPP H., LANGE D., ...Daha Fazla

GEOPHYSICAL RESEARCH LETTERS, cilt.43, ss.6817-6825, 2016 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 43 Konu: 13
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1002/2016gl069600
  • Dergi Adı: GEOPHYSICAL RESEARCH LETTERS
  • Sayfa Sayıları: ss.6817-6825

Özet

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 creepless than 6mm/yr compared to a far-field slip rate of over 20mm/yrsuggesting that the fault segment is currently accumulating stress.