Source mechanism of the Bartin earthquake of September 3, 1968 in northwestern Turkey: Evidence for active thrust faulting at the southern Black Sea margin
Abstract
The Bartin earthquake of September 3, 1968 is the strongest instrumentally recorded earthquake to occur along the Black Sea margin in northwestern Turkey. The source mechanism of the Bartin earthquake, as determined in this study from long period P wave first motions and from the inversion of P and SH waves, indicates thrust faulting with a strike of 28°, dip of 38° and rake of 80°. The average (centroid) depth is 4 km and the seismic moment is 3.9 × 10 25dyncm. The Bartin earthquake provides the first evidence for active thrust faulting at the southern margin of the Black Sea. The Black Sea has probably evolved as a back-arc basin resulting from the northward subduction of Tethys. Seismicity, fault plane solutions, and other geophysical data suggest that at the present time the Black Sea is closing under north-south compression.
- Publication:
-
Tectonophysics
- Pub Date:
- February 1986
- DOI:
- 10.1016/0040-1951(86)90159-9
- Bibcode:
- 1986Tectp.122...73A