The first notable eruption from Mount Cleveland was a Volcanic Explosivity Index ( VEI ) 3 Vulcanian eruption that occurred between June 10 and June 13, 1944.
12.
Mercalli described vulcanian eruptions as " . . . Explosions like cannon fire at irregular intervals . . . " Their explosive nature is due to increased silica content of the magma.
13.
The second eruption, which started on 19 October 1652, resulted in the formation of three Trachyte domes and involved explosive phases of Vulcanian eruptions, by the time the eruptions end on 26 October 1652.
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Landsat images taken during this time indicate that a lava lake may have existed in the central crater generating a plume of volcanic gases and, in September 1986, a vulcanian eruption that dropped ash in Salta, Argentina.
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The mechanics of a Pel�an eruption are very similar to that of a Vulcanian eruption, except that in Pel�an eruptions the volcano's structure is able to withstand more pressure, hence the eruption occurs as one large explosion rather than several smaller ones.
