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chapter 13 earth systems volcanoes
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Volcanoes can be one of the most destructive forces on Earth. It is estimated that some 500 million people live near active volcanoes (Lutgens and Tarbuck, 2013). Of the Earth's known volcanoes, 70 can be expected to erupt each year with at least one large eruption each decade (Lutgens & Tarbuck, 2013). As populations continue to increase and more people are attracted to the beauty surrounding these areas, the immediate threat to humans from these sometimes sleeping giants grows. Due to this, the study of volcanoes and the service that volcanologists provide to the public by way of information and predictions on activity is immeasurable. Named for the Roman god Vulcan, volcanoes have both intrigued and frightened mankind for centuries. Human like footprints dating back 300,000 years have been found in the solidified lava of Roccamonfina volcano in Italy (Onion, 2013). These footprints, called the "Devil's Trail" appear to indicate that these ancestors were escaping an eruption. In Turkey, a 9,000 year old painting depicting a volcanic eruption was discovered in 1964 during an excavation of Catalhyuk (Oskin, B., 2012). Perhaps one of the most famous written accounts of a volcanic eruption was written in 79 A.D. when Pliny the Younger wrote of the eruption of Mount Vesuvius in Italy. His uncle, Pliny the Elder, a naturalist, was killed after the eruption while trying to help the residents of Pompeii. Today the type of eruption that Mount Vesuvius encountered all those centuries ago is referred to as "Plinian" and was used to describe both the 1980 eruption of Mt. St. Helens and the 1991 eruption Mt. Pinatubo. (Ball, J. n.d.). Volcanology or Vulcanology, as it is sometimes called, is the study of vo... ... middle of paper ... ...ry. Retrieved from http://hvo.wr.usgs.gov/volcanowatch/archive/2003/03_12_04.html What does a volcanologist do? (n.d.). Volcano World. Retrieved from http://volcano.oregonstate.edu/what-does-volcanologist-do Williams-Jones, G., Vigouroux-Caillibot, N., van Hinsberg, V., Williams-Jones, A. (2010). Applications of the MultiGAS Sensor to Geothermal Exploration and Monitoring: Comparison of Plume and Fumarole Gas Compositions at Kawah Ijen Volcano, Indonesia. The Smithsonian/NASA Astrophysics Data System. Retrieved from http://adsabs.harvard.edu/abs/2010AGUFM.V23D..02W Unzen, Japan. (1994). Volcano World. http://volcano.oregonstate.edu/vwdocs/volc_images/img_unzen2.html USGS Volcanic Activity-Alert-Notification System. (modified March 14, 2012). Volcano Hazards Program. Retrieved from http://volcanoes.usgs.gov/activity/alertsystem/index.php
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.
...e than 30 volcanoes that have erupted over the past 300,000 years in the Lassen Peak volcanic area.
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
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.
From modern examples and records we know that volcanic activity can set of a chai...
The eruption on Mount Saint Helens has a specific cause and comes with many effects. A multifold of people would say that the “mountain looked like the site of an atomic blast” (Bredeson 30). That is a very accurate depiction as it took great power to inflict as much damage as it did. The reason for this impressive amount of force is that when magma is built up with pressure and an earthquake hits, the pressure gets magnified and the volcano explodes (Lewis). This is exactly what happened inside Mount Saint Helens. Furthermore, it has been revealed that “The earthquake that triggered the explosion was a 5.2 on the Richter scale” (Gunn 559). The earthquake to the magma can be compared as a match to gasoline. Even though the earthquake was not huge, the scale of the eruption was much greater than that of the earthquake (Gunn 560). The earthquake was only the trigger that allowed for more devastating things to occur. Thirteen hundred feet of the volcano were lost in the explosion followed by landslides, mudslides, and lava flows...
Many people in Pompeii managed to escape while others did not escape before the eruption happened. A volcano named Mt.Vesuvius erupted in the city of Pompeii located in Naples,Italy. It was a non-active volcano that suddenly became active years later and erupted. Some of the pompeians escaped while others did not. About 20,000 people lived in Pompeii when the eruption happened. The eruption wiped out the whole city, leaving 15-30 feet of ash behind killing about 2,000 people who did not escape.(39 )
The morning of August 24, 79 AD started off like every other day in Pompeii, Italy. The streets were full of people trying to do their daily chores and jobs. Then, at 1 P.M., the people of Pompeii saw and heard the explosion of volcanic rock erupting from Mount Vesuvius, which was less than five miles away from Pompeii. By 1:30 P.M. the whole sky was blocked out by volcanic rock and ash. The eruption lasted 25 hours and killed over 2,000
Helen’s Latest eruption was May, 18 1980. Only 57 people died in the disaster while in Pompeii, more than 2000 people died. The reason why that pompeii had more people die, was because, First of all, they didn’t have the technology to tell them whether the volcano would erupt or not. Secondly, they didn’t know the volcano would erupt, because of earthquakes happening all the time. Finally they didn’t realize they needed to get out until it was too
Stories about volcanoes are captivating. Myths come in different versions, but all of them are capable of capturing yours, and everybody’s imagination.
Volcanoes are one of natures most interesting and dangerous phenomenons. The way volcanoes operate can be understood, on a basic level, by just some simple physics and chemistry, this paper will investigate and explain some of the basic physics that govern the behavior of volcanoes.
...composite volcano because it erupts both lava and ash. Dormant and Extinct Volcanoes If a volcano shows no signs of life for thousands of years it is thought to be extinct. If a volcano shows activity, even slight movement, it is dormant. Volcanoes that have violent eruptions between long periods of no activity are usually stratovolcanoes. Volcanoes that are inactive and not expected to erupt in the near future are called dormant volcanoes. Volcanoes that are never expected to erupt again are called extinct. All of the volcanoes in the Cascade Range where MSH is found are dormant volcanoes. Approximately 50 or so volcanoes erupt every year. The International Association of Volcanology defines active volcanoes as one that has erupted in historic times. Historic can mean 200 years in Hawaii or 3,000 years in the Mediterranean depending if there are historical records.
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