GEOL105_8

GEOL105_8 - Volcanoes are capable of causing lots of...

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Unformatted text preview: Volcanoes are capable of causing lots of damage, physically and financially. Example major Chilean exposion last year, and another one this year, that caused great disturbance in terms of ash causing delays in flights, etc. when basaltic lava starts flowing, there is no stopping it. the slide above shows a house where the lava flow reached. It is called a fire sail. Unexpected but very dangerous. Eastern Oregon. Some indication of lava flows occur over large areas plateued basalts. Plateau (flood) basalts, NE Oregon This eruption might have been explosive enough that the lava flowed a long distance from the eruption. The volume is so great that it keeps flowing. The diversity of volcanic hazards They are probably related to mantle plumes large volumes of lava. Formed in a very short period of time and exploded also within a very short period of time causes the danger. Summary of loss of life related to volcanic hazards. (map). Last 500 years 7-8 major eruptions that have caused major loss of life. Eruptions can be catastrophic. Many of them die indirectly floods or debris, famine major cause of death occurred mostly in 1815 when volcano in Indonesia erupted so much ash that there was a summer without sun. so people could not grow enough food to survive. Tsunami volcanic generated sea wave also cause deaths. Most deaths from pyroclastic flows. Volcanoes are not occurring more frequently than they always have. But there is now rapid news, so more aware of it. so not the speed of volcanic activity that is an influential factor. One of the problems is that humans are expanding in population, in areas where we live. So now people moving out to urban areas to countryside. Vesuvius the grey part is urban areas. So now Vesuvius is surrounded by urban areas. The volcano in the middle has the potential (last erupted 1944), if it erupted quickly, evacuation would be impossible, to kill hundreds of 1000s of people. An eruption of Rainier could pose sever danger, property loss to people around it. now we are more aware of volcanoes. Volcanic ash Explosive release of gases and lava which produces microscopic pieces of glass- quickly cooled lava The most symmetrical and dangerous volcanoes in the world. Basaltic ash, actually gas but basaltic in composition larger particles settling down on the surface, smaller ones carry on forward towards other regions. Lava flows The lava flow we experience most are lava flows coming out basaltic volcanoes. Magmatism at earths surface Lava flow highly fluid, burnt the forest. Mauna Loa - Flows going a long way from the shield volcano, in some cases 30- 40 km away. Pyroclastic flows...
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GEOL105_8 - Volcanoes are capable of causing lots of...

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