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Barmin, A.
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- PublicationOpen AccessVolcanic Eruptions:Cyclicity during Lava Dome Growth(2008-07-04)
; ; ; ; ;Melnik, O.; Institute of Mechanics, Moscow State University, ;Sparks, R. S. J.; Earth Science Department, University of Bristol, ;Costa, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Barmin, A.; Institute of Mechanics, Moscow State University,; ; ; 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.179 393