Articles | Volume 8, issue 6
Clim. Past, 8, 2069–2078, 2012

Special issue: Past environmental and climatic stress during modern human's...

Clim. Past, 8, 2069–2078, 2012
Research article
20 Dec 2012
Research article | 20 Dec 2012

Possible earthquake trigger for 6th century mass wasting deposit at Lake Ohrid (Macedonia/Albania)

B. Wagner1, A. Francke1, R. Sulpizio2, G. Zanchetta3, K. Lindhorst4, S. Krastel4,5, H. Vogel1, J. Rethemeyer1, G. Daut6, A. Grazhdani7, B. Lushaj7, and S. Trajanovski8 B. Wagner et al.
  • 1Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, 50674 Cologne, Germany
  • 2Dipartimento di Scienze della Terra e Geoambientali, University of Bari, Italy
  • 3Dipartimento di Scienze della Terra, University of Pisa, Italy
  • 4Helmholtz Centre for Ocean Research, GEOMAR, Kiel, Germany
  • 5Institute of Geosciences, University of Kiel, Germany
  • 6Institute of Geography, University of Jena, Germany
  • 7Institute of Geosciences & Energy, Water & Environment, Polytechnic University of Tirana, Albania
  • 8Hydrobiological Institute Ohrid, 6000 Ohrid, Macedonia

Abstract. Lake Ohrid shared by the Republics of Albania and Macedonia is formed by a tectonically active graben within the south Balkans and suggested to be the oldest lake in Europe. Several studies have shown that the lake provides a valuable record of climatic and environmental changes and a distal tephrostratigraphic record of volcanic eruptions from Italy. Fault structures identified in seismic data demonstrate that sediments have also the potential to record tectonic activity in the region. Here, we provide an example of linking seismic and sedimentological information with tectonic activity and historical documents. Historical documents indicate that a major earthquake destroyed the city of Lychnidus (today: city of Ohrid) in the early 6th century AD. Multichannel seismic profiles, parametric sediment echosounder profiles, and a 10.08 m long sediment record from the western part of the lake indicate a 2 m thick mass wasting deposit, which is tentatively correlated with this earthquake. The mass wasting deposit is chronologically well constrained, as it directly overlays the AD 472/AD 512 tephra. Moreover, radiocarbon dates and cross correlation with other sediment sequences with similar geochemical characteristics of the Holocene indicate that the mass wasting event took place prior to the onset of the Medieval Warm Period, and is attributed it to one of the known earthquakes in the region in the early 6th century AD.

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