Tsunamigenic earthquakes in the Chios-Çesme strait, Aegean Sea


Altıok Y., ALPAR Ş. B. , Özer N. , Gazioğlu C.

General Assambly of the European Geosciences Union, Austria, 1 - 04 April 2005

  • Publication Type: Conference Paper / Full Text
  • Country: Austria

Abstract

Some historical earthquakes occurred in and around Turkey have resulted in tsunamis.
Most risk-prone areas in the eastern central Aegean Sea are the Izmir Bay, Karaburun
peninsula and Chios Island. The level of seismic activity and tsunami potential
is influenced by the presence of normal faults around the region. There have been
about 40 moderate-size earthquakes from 496 BC to 1949 AD. Among these earthquakes,
20.03.1389, 13.11.1856, 19.01.1866, 03.04.1881 and 23.07.1949 events produced
tsunamis. The Chios-Cesme earthquake (1881, Mw 6.5) took place to the south
of the Cesme strait while the Chios-Karaburun earthquake (1949, Mw 6.7) occurred
to its north. Both events created tsunamis that resulted in destruction along the coasts
of Chios Island and Cesme. In both cases, abnormal sea level changes were observed
following the aftershocks. These events are found to be associated with slumps and
landslides along the steep shores of the Chios Island and the Karaburun Peninsula.
Seafloor slope, slope direction, and roughness as defined by the curvature of contours,
can aid the identification of potential slides more likely to produce tsunamis.