Tectonic impact on the Lake Sevan environment (Armenia) |
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| Authors: | A Karakhanian P Tozalakyan J C Grillot H Philip D Melkonyan P Paronyan S Arakelyan |
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| Institution: | (1) "Georisk" Scientific Research Company (Armenia), 24a Baghramyan, Yerevan, Armenia, AM;(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: +33-467143031, FR;(3) State Engineering University of Armenia, 105 Terian str., Yerevan, 375009, Armenia, AM;(4) Institute of Biotechnology, 14 Gurdjian Str., 375056, Yerevan, Armenia, AM |
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| 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.
Received: 2 November 1999 · Accepted: 27 January 2000 |
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| Keywords: | Active faults Lake Sevan environment Methane emission Pull-apart basin |
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