Types of Volcano
Based on the high and low degree of fragmentation and breadth, are also strong and weak high eruption columns of smoke, the volcano eruption is divided into several types:
a. Hawaiian type, namely the explosive eruption of basaltic magma at or near the basalt, generally in the form of bursts of lava, and lava flow often followed simultaneously, occurs in a gap or a simple crater
b. Strombolian type, similar to Hawaiian eruptions of lava bursts from a shallow magma, generally occurs at frequently active volcano on the edge of the continent or in the middle of the continent
c. Plinian type, is a very explosion eruption of magma of high viscosity or acid magma, magma composition is andesitic to riolitik. Pumice eruption material in bulk form
d. Type of Sub-Plinian, explosive eruption of magma acid / riolitik of strato volcano, eruption stage riolitik efusifnya produce lava dome. Subplinian eruptions can result in the formation of ignimbrite
e. Ultra Plinian type, highly explosive eruptions produce a precipitate pumice more common and widespread of the Plinian
f. Type Vulkanian, basaltic andesite eruptions magmatis with composition to dacite, generally throws bombs or volcanic blocks around the crater and is often accompanied by bomb-bread crust or surface cracks. Eruption material not only derived from the magma but mixed with the rock side of lytic
g. Type and Type Freatoplinian Surtseyan, both types are eruptions that occurred on the island of volcanoes, submarine volcanoes or volcanic crater lake. Surtseyan an eruption of basaltic magma interaction with the surface or subsurface water, eruptions called freatomagmatik. Freatoplinian happened with Surtseyan, but magma interacts with water with composision riolitik.
Forms and volcanic landscape, comprising: a cone shape, formed by pyroclastic deposits or lava, or both; shape of the dome, formed by lava in the crater of a breakthrough, formed like a dome; cinder cone, formed by cinder bedding material or skoria; maar, usually formed on foot slopes or major volcanic eruption phreatic or freatomagmatik; plateau, the plateau from by lava.
Volcano eruption is an event that occurs due to deposition of magma in the bowels of the earth is pushed out by high-pressure gas.
Magma is the incandescent liquid contained in the layer of earth with a very high temperature, which is estimated at more than 1,000 ° C. Liquid magma coming out of the earth is called lava. The temperature of lava which issued could reach (700-1200)° C. Volcanic eruptions that brought rock and ash can be sprayed as far as the radius of 18 km or more, while the lava could flood as far as 90 km radius