堪培拉essay代写:危险是喷发

2018-01-17 20:48

由于火山（取决于类型）而发生的主要和最明显的危险是喷发。对于火山来说，如夏威夷的基拉韦厄（Kilauea）火山喷发由于压力较低而不那么危险，熔岩倾向于喷发而不是其他材料。这些类型火山喷发的主要危险是熔岩本身，在某些情况下可能达到广泛区域，并破坏大部分路径。美国华盛顿类似圣海伦火山的火山有极其危险的爆发（也称为Vesuvian火山喷发），其本身涉及许多不同的危险。 “大量含灰的气体剧烈排放，形成高于火山的花椰菜形云”（Tilling，1985）。 （Myers＆Brantley，1995）的一篇报道描述了喷发的爆炸效应，例如：“爆发性爆发使巨大的爆炸物和坚固的岩石碎片（tephra）轰击到空气中，最大的碎片（炸弹）到通风口附近的地面，通常在2英里之内，最小的岩石碎片（灰）继续上升到空气中，形成一个巨大的，滚滚向前的爆炸柱......喷发柱子的尺寸可以很大，迅速增长，达到12在火山之上不到30分钟的时间，一旦在空中，火山灰和天然气形成一个喷发云... ...大火山喷发云可以从火山的下风向行进数百英里，造成失败的巨大地区。
堪培拉essay代写:危险是喷发
The main and most obvious hazard that occurs due to a volcano (depending on the type) is the eruption. For volcanoes such as Kilauea in Hawaii the effusive eruption is less dangerous due to the lower pressure and lava tends to be erupted rather than other materials. The main hazard from these types of eruptions is the lava itself, which can reach widespread areas in some cases and destroys most things in its path. Volcanoes similar to Mount St. Helens in Washington, USA have extremely dangerous explosive eruptions (also known as Vesuvian eruptions) which involve many different hazards in themselves. "Massive quantities of ash-laden gas are violently discharged to form a cauliflower-shaped cloud high above the volcano" (Tilling, 1985). A report by (Myers & Brantley, 1995) describes the effects of the blast from an eruption such as this: "An explosive eruption blastsmolten and solid rock fragments (tephra)into the air with tremendous force. The largest fragments (bombs) fall back to the ground near the vent, usually within 2 miles. The smallest rock fragments (ash) continue rising into the air, forming a huge, billowingeruption column. ... Eruption columns can be enormous in size and grow rapidly, reaching more than 12 miles above a volcano in less than 30 minutes. Once in the air, the volcanic ash and gas form an eruption cloud. ... Large eruption clouds can travel hundreds of miles downwind from a volcano, resulting inash fallover enormous areas"

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