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Journal of the Geological Society

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Neotectonics of the Marmara Sea region of Turkey

British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, Scotland, UK

Seismological investigations in Western Anatolia, NW Turkey have identified linear patterns of earthquake epicentres outlining a wedge-shaped block in the area of the Marmara Sea. This block shows different seismic characteristics from the rest of Western Anatolia and appears to act as a separate tectonic unit. Earthquake fault-plane mechanisms show that the Marmara block is being rotated and sheared in order to accommodate the right-lateral motion of the north Anatolian Fault and the extensional tectonics of the southwestern Anatolia. Investigations of the behaviour of seismic shear-waves suggest that neotectonic stress aligns water-filled microcracks throughout the upper (brittle) 10–20 km of the crust and that in situ stress directions can be monitored by analysis of shear waves recorded on three-component instuments.

This article has been cited by other articles:

				Interseismic Strain Accumulation in the Marmara Sea Region Bulletin of the Seismological Society of America, February 1, 2002; 92(1): 216 - 229.