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physics behind volcanoes
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1.0 Topic Definition
Volcanic Eruption, which means the sudden occurrence of a violent discharge of steam and volcanic material, is one of the catastrophes in human history. It can devastate enormous areas, as well as people. The eruption of the Vesuvius in AD 79 buried the cities of Herculaneum, Pompeii and Stabiae with ashes and mud. (Oracle think quest) The majority of ancient volcanoes, like Mt. Vesuvius in Italy and Mt. Tambora in Indonesia are all dormant volcanoes now. However, Mt. Etna, which have been erupting for millions of years, still remaining active now. (Sicily Life) From 4 May 2011 to 6 May, it erupted and emitted enormous lava - molten rock - and ashes - chemical composition and abrasive of the particles from a volcanic eruption - into the air. For the sake of it is one of the most active volcanoes in the world, acquire the basic information about volcano and Mt. Etna is essential.
2.0 History
The eruption history of Etna started since 1500 BC. (Mount Etna- Italy) Its eruption history experienced different eruption styles, including violent explosions and voluminous lava flows. (Jessica Ball) Flank eruptions of Mount Etna occur every six years on average resulting from dikes form the central conduit intersecting the surface. (Revise Mapping of Lava Flows on Mt. Etna, Sicily) One of the most violet eruptions was in 1852. Mt. Etna produce more than 2 billion cubic feet of lava and over three square miles have been covered. The longest eruption began in 1979 which lasted for 13 years. (Mount Etna Volcano)
The eruptions of Mount Etna undergo fluctuations in time. The fluctuations represent stages of cycle on a scale of decades and centuries. (Behncke, B., Neri, M., 2003) Since the eruption in 1865, with fo...
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Mount Etna volcano tour and Sicily tours [Online] Available at: http://www.mountetna.net/ [Accessed 25 August 2011]
Mt Etna Volcano – John Seach (2011) [Online] Available at: http://www.volcanolive.com/etna.html [Accessed 25 August 2011]
Mount Etna erupting on 11 January (2011) [Online] Available at: http://esamultimedia.esa.int/docs/EarthObservation/GMES_newsletter_n1_etna.pdf [Accessed 1 September 2011]
Zehner., C. (2011) Monitoring Volcanic Ash from Space [Online] Available at: http://earth.eo.esa.int/workshops/Volcano/files/STM_280_ash101124.pdf [Accessed 1 September 2011]
Volcanic Eruption (2011) [Online] Available at: http://library.thinkquest.org/17457/volcanoes/erupt.php [Accessed 9 September 2011]
Prediction of Danger (2011) Available at: http://library.thinkquest.org/17457/volcanoes/erupt.php [Accessed 9 September 2011]
MILLER, C. D. POTENTIAL HAZARDS FROM FUTURE ERUPTIONS IN THE VICINITY OF MOUNT SHASTAVOLCANO, NORTHERN CALIFORNIA. N.p.: US Government Printing Office, 1980. Print.
On May 18th, 1980, one of the most prominent volcanic eruptions in US History took place in the state of Washington. Mount St. Helens had been dormant for almost 100 years before March 15th. On this day, two months before the eruption several small earthquakes shook the earth. This indicated a magma buildup below the surface, and the first minor event that would lead to one of the greatest eruptions the US has ever known. Following the first set of earthquakes, “Steam explosions blasted a 60- to 75-m (200- to 250-ft) wide crater through the volcano 's summit ice cap and covered the snow-clad southeast sector with dark ash. Within a week the crater had grown to about 400 m (1,300 ft) in diameter and two giant crack systems crossed the entire summit area. Eruptions occurred on average from
In March 18, 1880 Mount St. Helens there was a catastrophic eruption that caused a huge volume of ash; the ash plume would be over central Colorado within 16 hours. After years of dedicated monitoring (knowing where to volcano is, unlike an earthquake not knowing exactly where this geological even is exactly) there was been increasing accuracy in forecasting eruptions.
On May 22, 1915, an explosive eruption at Lassen Peak devastated nearby areas and rained volcanic ash farther 200 miles to the east! This explosion was the most powerful in a series of eruptions from 1914 through 1917. ...
These differences are in the makeup of the volcano, the impact on society, and the eruption itself. Mount Saint Helens, used to be a wonder of the world, but now a damage site of what happened on May 18, 1980. Mauna Loa is a tourist destination and one of the most active dispensers of lava and magma in the world. As shown, these volcanoes can’t be more different. Yet, each volcano has been a culprit to destruction, and have similarities within themselves. This report has expressed many similarities and differences and brought facts and knowledge to the historical eruptions by these impressive and ancient structures of
Volcanoes are one of the most disastrous yet captivating geological land forms on earth. Many volcanic eruptions are catastrophic, but not all volcanic eruptions are as brutal. The two case studies I have chosen to compare and contrast are the 1980 Mount St. Helens eruption with the eruption of Hawaii’s Kilauea volcano which is still active today.
The ejecta from the eruption moved over land and through the air: the ash that fired out of the volcano was blown as far east as Nebraska in a huge, dark cloud of plinian ash. A nuee ardente billowed over the rim of the volcano and spread lava to the south, east and north, forming a volcanic outcrop now called the Bishop Tuff. Today, an expanding resurgent dome in the center of the depression indicates current magmatic activity beneath the caldera, and earthquake swarms in the last 25 years could also be linked to subsurface magma movement. Clearly, the Long Valley caldera is not dormant, so understanding the eruption that formed the caldera and surrounding features is essential to assessing the region's current and, more importantly, possible future activity.
Mt. St. Helens is famously for its eruption on May 18, 1980, although the mountain had previous eruptions with four different stages and the stages often had similarities including the devastating one in 1980; in addition, the 1980 eruption presented serious havoc that led to a long road of recovery. The first stage known as the Ape Canyon Stage and according to the U.S. Geological survey it was ignited from series of small eruptions that created the birth of the mountain; during this phase these eruptions possibly formed domes and pyroclastic flows. Mt. St. Helens in the Cougar stage formulated lava domes and flows just like the Ape Canyon stage including eruptions that escalated enormous volumes of ash along with pyroclastic flows; furthermore
The new studies have showed that the last eruption the volcano has had was around 60,000 years ago and by studying the ejected microscopic rock indicates that the volcano has entered into a new phase of volcanic movement.
On the morning of June 6th, 1912, the ground of the southern Alaskan peninsula began to shake with extreme force. This force, when later analyzed turned out to be the most powerful volcanic eruption of the 20th century. This newly formed caldera volcano later known, as Novarupta, literally translated as “new eruption”, is located in Katmai National Park and Reserve on the Alaskan Aleutian Range (Pidwirny and Jones 2009). Novarupta’s eruption caused immediate impacts to the native Alaskan climate as well as impacts to earth’s global climate overall. Volcanoes can leave enormous impacts locally to geography and ecosystems, but because of Novarupta’s status as the strongest volcanic eruption in Alaska’s recorded history, Novarupta left local as well as global impacts on earth’s climate. The Novarupta volcano eruption negatively impacted global climate by expelling a wide aerosol/dust veil of volcanic ash that decreased global temperature significantly, releasing oxides into the atmosphere, and triggering numerous earthquakes after the initial eruption.
The volcano of Mount Etna has been on this earth for about 500,000 years and is still currently active. This volcano is located on the east side of Sicily, Italy and stands 10,900 feet tall with a base circumference of 93 miles; it also still has a series of eruptions dating back to 2001. Mount Etna is considered a stratovolcano which means it’s built on top of many layers of lava and ash made from previous eruptions. What makes this volcano so unique is that it has many eruption styles ranging from extreme violent ones to regular lava just flowing from the mouth of it. About “25% Sicily 's population lives on Mount Etna 's slopes.” Etna stands tall above Catania which is a city on the island of Sicily. This stratovolcano plays a major influence in Sicily because “it is the main source of income for the island, both from agriculture (due to its rich volcanic soil) and tourism.” Mount Etna is truly a great sight to see and is cool because it
Volcanoes have always been a mysterious wonder of the world. Volcanoes have shaped the landscape and the very ground that we all live on. People have written stories of their disastrous eruptions, and painted their marvelous shapes on canvas. The essay will outline some of the more famous volcanoes and how they have impacted are history. Mount Vesuvius that destroy the great city of Pompeii, Krakatoa they spewed deadly ash on small village town, and Mount St. Helen, the only volcano in my own country to every erupt during my own time period.
Stories about volcanoes are captivating. Myths come in different versions, but all of them are capable of capturing yours, and everybody’s imagination.
Mount Vesuvius is a strato-volcano consisting of a volcanic cone (Gran Cono) that was built within a summit caldera (Mount Somma). The Somma-Vesuvius complex has formed over the last 25,000 years by means of a sequence of eruptions of variable explosiveness, ranging from the quiet lava outpourings that characterized much of the latest activity (for example from 1881 to 1899 and from 1926 to 1930) to the explosive Plinian eruptions, including the one that destroyed Pompeii and killed thousands of people in 79 A.D. At least seven Plinian eruptions have been identified in