Hawaiian eruptions usually start by the formation of a crack in the ground from which a curtain of incandescent magma or several closely spaced magma fountains appear.
12.
The lava flows are more viscous, and therefore shorter and thicker, than the corresponding Hawaiian eruptions; it may or may not be accompanied by production of pyroclastic rock.
13.
Fissure venting is common in Hawaii; most Hawaiian eruptions begin with a so-called " wall of fire " along a major fissure line before centralizing to a small number of points.
14.
Also unlike other eruptive types, Hawaiian eruptions often occur at decentralized fissure vents, beginning with large " curtains of fire " that quickly die down and concentrate at specific locations on the volcano's rift zones.
15.
Any future eruption is likely to affect low flying air traffic only, since eruptions would likely be in the form of Hawaiian eruption-lava fountains that create small cinder cones and lava flows rather than voluminous ash clouds.
16.
Hawaiian eruptions often begin as a line of vent eruptions along a fissure vent, a so-called " curtain of fire . " These die down as the lava begins to concentrate at a few of the vents.
17.
K + lauea erupted in 1823 and 1832, but the first major eruption since the 1790 event occurred in 1840, when its eastern rift zone became the site a large, effusive Hawaiian eruption over of its length, unusually long even for a rift eruption.
18.
Flows from Hawaiian eruptions can be divided into two types by their structural characteristics : phoehoe lava which is relatively smooth and flows with a ropey texture, and aa flows which are denser, more viscous ( and thus slower moving ) and blockier ( see and ).
19.
Although Hawaiian eruptions are named after the volcanoes of Hawaii, they are not necessarily restricted to them; the largest lava fountain ever recorded formed on the island of Izu Lshima ( on Mount Mihara ) in 1986, a gusher that was more than twice as high as the mountain itself ( which stands at ).
20.
Hawaiian eruptions may occur along fissure vents, such as during the eruption of Mauna Loa Volcano in 1950, or at a central vent, such as during the 1959 eruption in K + lauea Iki Crater, which created a lava fountain 580 meters ( 1, 900 ft ) high and formed a 38-meter cone named Puu Puai.