The Mount Pinatubo Eruption

The Mount Pinatubo Eruption In June 1991, the second-largest volcanic eruption of the twentieth century* took place on the island of Luzon in the Philippines, a mere 90 kilometers (55 miles) northwest of the capital city Manila. Up to 800 people were killed and 100,000 became homeless following the Mount Pinatubo eruption, which climaxed with nine hours of the  eruption on June 15, 1991. On June 15, millions of tons of sulfur dioxide were discharged into the atmosphere, resulting in a decrease in the temperature worldwide over the next few years. The Luzon Arc Mount Pinatubo is part of a chain of composite volcanoes along the Luzon arc on the west coast of the island (area map). The arc of volcanoes is due to the subduction of the Manila trench to the west. The volcano experienced major eruptions approximately 500, 3000, and 5500 years ago. The events of the 1991 Mount Pinatubo eruption began in July 1990, when a magnitude 7.8 earthquake occurred 100 kilometers (62 miles) northeast of the Pinatubo region, determined to be a result of the reawakening of Mount Pinatubo. Before the Eruption In mid-March 1991, villagers around Mount Pinatubo began feeling earthquakes and vulcanologists began to study the mountain. (Approximately 30,000 people lived on the flanks of the volcano prior to the disaster.) On April 2, small explosions from vents dusted local villages with ash. The first evacuations of 5,000 people were ordered later that month. Earthquakes and explosions continued. On June 5, a Level 3 alert was issued for two weeks due to the possibility of a major eruption. The extrusion of a lava dome on June 7 led to the issuance of a Level 5 alert on June 9, indicating an eruption in progress. An evacuation area 20 kilometers (12.4 miles) away from the volcano was established and 25,000 people were evacuated. The following day (June 10), Clark Air Base, a U.S. military installation near the volcano, was evacuated. The 18,000 personnel and their families were transported to Subic Bay Naval Station and most were returned to the United States. On June 12, the danger radius was extended to 30 kilometers (18.6 miles) from the volcano resulting in the total evacuation of 58,000 people. The Eruption On June 15, the eruption of Mount Pinatubo began at 1:42 p.m. local time. The eruption lasted for nine hours and caused numerous large earthquakes due to the collapse of the summit of Mount Pinatubo and the creation of a caldera. The caldera reduced the peak from 1745 meters (5725 feet) to 1485 meters (4872 feet) high is 2.5 kilometers (1.5 miles) in diameter. Unfortunately, at the time of the eruption Tropical Storm Yunya was passing 75 km (47 miles) to the northeast of Mount Pinatubo, causing a large amount of rainfall in the region. The ash that was ejected from the volcano mixed with the water vapor in the air to cause a rainfall of tephra that fell across almost the entire island of Luzon. The greatest thickness of ash deposited 33 centimeters (13 inches) approximately 10.5 km (6.5 mi) southwest of the volcano. There was 10 cm of ash covering an area of 2000 square kilometers (772 square miles). Most of the 200 to 800 people (accounts vary) who died during the eruption died due to the weight of the ash collapsing roofs and killing two occupants. Had Tropical Storm Yunya not been nearby, the death toll from the volcano would have been much lower. In addition to the ash, Mount Pinatubo ejected between 15 and 30 million tons of sulfur dioxide gas. Sulfur dioxide in the atmosphere mixes with water and oxygen in the atmosphere to become sulfuric acid, which in turn triggers ozone depletion. Over 90% of the material released from the volcano was ejected during the nine-hour eruption of June 15. The eruption plume of Mount Pinatubos various gasses and ash reached high into the atmosphere within two hours of the eruption, attaining an altitude of 34 km (21 miles) high and over 400 km (250 miles) wide. This eruption was the largest disturbance of the stratosphere since the eruption of Krakatau in 1883 (but ten times larger than Mount St. Helens in 1980). The aerosol cloud spread around the earth in two weeks and covered the planet within a year. During 1992 and 1993, the Ozone hole over Antarctica reached an unprecedented size. The cloud over the earth reduced global temperatures. In 1992 and 1993, the average temperature in the Northern Hemisphere was reduced 0.5 to 0.6 °C and the entire planet was cooled 0.4 to 0.5 °C. The maximum reduction in global temperature occurred in August 1992 with a reduction of 0.73 °C. The eruption is believed to have influenced such events as 1993 floods along the Mississippi River and the drought in the Sahel region of Africa. The United States experienced its third coldest and third wettest summer in 77 years during 1992. The Aftermath Overall, the cooling effects of the Mount Pinatubo eruption were greater than those of the El Nià ±o that was taking place at the time or of the greenhouse gas warming of the planet. Remarkable sunrises and sunsets were visible around the globe in the years following the Mount Pinatubo eruption. The human impacts of the disaster are staggering. In addition to the up to 800 people who lost their lives, there was almost one-half of a billion dollars in property and economic damage. The economy of central Luzon was horribly disrupted. In 1991, the volcano destroyed 4,979 homes and damaged another 70,257. The following year 3,281 homes were destroyed and 3,137 were damaged. Damage following the Mount Pinatubo eruption was usually caused by lahars - rain-induced torrents of volcanic debris that killed people and animals and buried homes in the months after the eruption. Additionally, another Mount Pinatubo eruption in August 1992 killed 72 people. The United States military never returned to Clark Air Base, turning over the damaged base to the Philippine government on November 26, 1991. Today, the region continues to rebuild and recover from the disaster.

Paper Proposal Research

Paper Proposal Research Paper Proposal Research Paper Proposal Research: Think before Writing Writing of a paper proposal is the first step you should take before getting down to your paper project. You may wonder whether it is really necessary to write this paper proposal. Yes, it is! But it should be noticed that many students do not understand why they have to write any additional papers except their assignment paper. So, lets explain you the issue. Actually, you support your prospective paper project by writing a paper proposal. You should convince your audience that the topic your have chosen is actual. Besides, you should prove that it is not studied completely; that is why your investigation is worth making. Thus, you see that the success of your paper project depends on a paper proposal considerably. That is why you should think over your paper proposal well and make a kind of paper proposal research. That means that you should think over what points you will highlight in your paper proposal and in what way you will put them. Paper Proposal Research Writing Steps Speaking about the paper proposal research one can point out the following steps you should take to write a convincing paper proposal: Topic. It is obvious that any paper proposal research should begin with studying of the topic you are going to write your paper project on. What kind of study should it be? You should answer the following questions:What are the matter points of the topic? Is the chosen topic actual? Who investigated it before? Of course, you should also provide the background information in your paper proposal. So, you should study informational materials on the topic properly. Literature. You should review informational sources that your paper will be based on. State works of researchers who investigated the issue. This part of your paper proposal research should prove that, firstly, your project has the solid basis and, secondly, you have already studied some information on the topic. Research question. What ex actly are you going to study? You should determine a point of the topic that is the most interesting for you and state it in your paper proposal. Methodology. In what way are you going to make your investigation? You should determine what methods you will apply in your study. Forecasts. How can you catch the interest of your audience? Of course, by making some predictions. So, what results of your study do you expect? Giving some forecasts at the end of your paper proposal will make it intriguing. Paper Proposal Research: Get Help! Thus, these are the main steps of the paper proposal research that will help you write a good paper proposal. If you have any difficulties with your paper project proposal writing, you may look for help in any paper project proposal sample placed in the Internet or contact us! We guarantee you professional help!