Seafloor Geodesy Revealed Partial Creep of the North Anatolian Fault Submerged in the Sea of Marmara

Ryusuke Yamamoto, Motoyuki Kido, Yusaku Ohta, Narumi Takahashi, Yojiro Yamamoto, Ali Pinar, Doğan Kalafat, Haluk Özener, Yoshiyuki Kaneda

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

In this study, the creep rate across the North Anatolian Fault was directly measured in the western Sea of Marmara using the seafloor acoustic ranging technique; the data reveal coupling conditions on the fault interface and stress accumulation with implications for regional seismic risk evaluation. Continuous measurements over a period of 3.5 years at a site in the Western High clearly indicate right-lateral displacement at a rate of 10.7 ± 4.7 mm/year (95% confidence level); approximately half of the regional block motion at this location is released by this steady motion. A simple model of three elastic layers—a partially creeping sedimentary layer (8 km) at the top with the observed rate, a locked (3 km) and fully creeping layer in the middle, and a bottom layer—assumed from seismicity, reasonably explains onshore Global Navigation Satellite System data for the surrounding region.

Original languageEnglish
Pages (from-to)1268-1275
Number of pages8
JournalGeophysical Research Letters
Volume46
Issue number3
DOIs
Publication statusPublished - 2019 Feb 16

Keywords

  • North Anatolian Fault
  • acoustic ranging
  • creep
  • sea of Marmara
  • seafloor geodesy

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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