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Authors: Melnik, O.* 
Sparks, R. S. J.* 
Costa, A.* 
Barmin, A.* 
Title: Volcanic Eruptions:Cyclicity during Lava Dome Growth
Issue Date: 4-Jul-2008
Keywords: Volcanic Eruptions
During Lava
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous 
04. Solid Earth::04.08. Volcanology::04.08.04. Thermodynamics 
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
Abstract: We consider the process of slow extrusion of very viscous magma that forms lava domes. Dome-building eruptions are commonly associated with hazardous phenomena, in- cluding pyroclastic flows generated by dome collapses, explosive eruptions and volcanic blasts. These eruptions commonly display fairly regular alternations between pe- riods of high and low or no activity with time scales from hours to years. Usually hazardous phenomena are asso- ciated with periods of high magma discharge rate, thus, understanding the causes of pulsatory activity during ex- trusive eruptions is an important step towards forecasting volcanic behavior, especially the transition to explosive ac- tivity when magma discharge rate increases by a few orders of magnitude. In recent years the risks have increased be- cause the population density in the vicinity of many active volcanoes has increased.
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