A tomographic image of the shallow crustal structure in the Eastern Marmara

Karabulut H., OZALAYBEY S., Taymaz T., AKTAR M., SELVI O., KOCAOGLU A.

GEOPHYSICAL RESEARCH LETTERS, vol.30, no.24, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 24
  • Publication Date: 2003
  • Doi Number: 10.1029/2003gl018074
  • Journal Name: GEOPHYSICAL RESEARCH LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Istanbul Technical University Affiliated: No

Abstract

We present a 2-D tomographic seismic velocity image in eastern Marmara region along a N-S trending 120-km long seismic refraction profile, which traverses the northern branches of North Anatolian Fault (NAF) and tectonically active Cinarcik Basin, in the Sea of Marmara. The 2-D velocity model, which is constrained down to upper crustal depth of 7 km, shows significant heterogeneities in the upper crust displayed by well-constrained velocity anomalies. The seismicity observed following the 17 August, 1999 Izmit earthquake concentrates in three distinct zones and takes place near the inferred low velocity zones and below high velocity anomalies obtained from tomographic inversion. This correlation is interpreted as a result of intensely sheared zones of deformation imposed by strike-slip motion of the northern branches of the North Anatolian Fault.