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Authors of
Prof. Dr. V.J. Dietrich
Institute for Mineralogy and Petrography
ETH Zürich

Prof. Dr. Lorenz Hurni
Institute of Cartography
ETH Zürich

The Final GEOWARN Product Early Warning System and Emergency Plan > Early Recognition of Reactivation of a Magmatic System > Reactivation of Volcanic Activity in the Kos-Yiali-Nisyros-Tilos Volcanic Field

Reactivation of Volcanic Activity in the Kos-Yiali-Nisyros-Tilos Volcanic Field

Reactivation of magmatic and volcanic activity in quiescent volcanic areas is signaled by an increase in geodynamic activity. This is expressed as earthquake activity followed by changes in chemical and isotopic compositions, and increased temperatures in hot springs and of gases and waters in fumarolic fields. In most cases, large tectonic earthquakes are potential eruption precursors and predate the onset of volcanic unrest in time scales of weeks and months .

These well-known phenomena have been reported at many dormant volcanoes in geotectonic environments similar to the volcanoes in the Kos-Yali-Nisyros-Tilos volcanic field since historical times, e.g. Santorini 3640 years BP, Vesuvius 79 AD, Columbos volcano north-east of Santorini 1650, Krakatao 1883, Mt. St. Helens 1980 and Pinatubo 1990.




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