Geochemical indicators of possible ongoing volcanic unrest at Nisyros Island (Greece)

Details Geochemical indicators of possible ongoing volcanic unrest at Nisyros Island (Greece) Geochemical indicators of possible ongoing volcanic unrest at Nisyros Island (Greece)

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29p...6c&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 16, pp. 6-1, CiteID 1759, DOI 10.1029/2001GL014355

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8

Volcanology: Hydrothermal Systems (8135), Volcanology: Eruption Monitoring (7280), Geochemistry: General Or Miscellaneous

Scientific paper

Significant changes occurred in the chemistry of gases discharged from Nisyros fumaroles in the years, 1997-2001, following a strong seismic crisis. Increasing H2S/CO2 ratios and decreasing CH4/CO2 ratios are attributed to an increased contribution of magmatic fluids to the hydrothermal system. Some fumaroles showed concurrent increases in H2 and CO contents implying increases in temperature and pressure in the upper parts of the hydrothermal system. These changes reinforce the possibility of an increased hazard of hydrothermal eruptions at present with respect to the '90's. Moreover, both the present events and the historical hydrothermal eruptions may represent precursory signals of a new period of volcanic unrest at Nisyros.

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