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Environmental Geology

, Volume 40, Issue 3, pp 279–288 | Cite as

Tectonic impact on the Lake Sevan environment (Armenia)

  • A. Karakhanian
  • P. Tozalakyan
  • J. C. Grillot
  • H. Philip
  • D. Melkonyan
  • P. Paronyan
  • S. Arakelyan
Research article

Abstract

 The geology of Lake Sevan is characterized by the structure of a pull-apart basin. Methane emission from the lake surface correlates with evidence of physical and chemical water properties, remote sensing, etc., and suggests its possible emission from active fault zones at the lake bottom, as well as emission of biogenic methane from the fermentation of bottom organic remains. Correlation with anomalies in the lake bottom geochemistry suggests a high permeability of active fault zones and suggests that geodynamic, seismic and geochemical activity across the fault zones during the buildup to the M=7.1 Spitak earthquake led to plankton depression, which resulted in a large number of fish dying in 1984, and ended with a seismic disaster in 1988.

Keywords Active faults Lake Sevan environment Methane emission Pull-apart basin 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • A. Karakhanian
    • 1
  • P. Tozalakyan
    • 1
  • J. C. Grillot
    • 2
  • H. Philip
    • 2
  • D. Melkonyan
    • 3
  • P. Paronyan
    • 4
  • S. Arakelyan
    • 1
  1. 1."Georisk" Scientific Research Company (Armenia), 24a Baghramyan, Yerevan, ArmeniaAM
  2. 2.Unities of Research "Hydrosciences" and "Tectonics", University of Montpellier, Place E. Bataillon, 34095 Montpellier Cédex 05, France e-mail: grillot@msem.univ-montp2.fr Tel.: +33-467143703 Fax: +33-467143031FR
  3. 3.State Engineering University of Armenia, 105 Terian str., Yerevan, 375009, ArmeniaAM
  4. 4.Institute of Biotechnology, 14 Gurdjian Str., 375056, Yerevan, ArmeniaAM

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