Tsunami and Physical Protection Measures Essay Example for Free

Tsunami and Physical Protection Measures Essay What is tsunami? A tsunami (plural: tsunamis or tsunami; from Japanese: æ ´ ¥Ã¦ ³ ¢, lit. harbor wave;[1] English pronunciation: /suË Ã‹Ë†nÉ‘Ë mi/ soo-nah-mee or/tsuË Ã‹Ë†nÉ‘Ë mi/ tsoo-nah-mee[2]) is a series of water waves caused by the displacement of a large volume of a body of water, typically an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions (including detonations of underwater nuclear devices), landslides, glacier calving, meteorite impacts and other disturbances above or below water all have the potential to generate a tsunami. [3] Tsunami waves do not resemble normal sea waves, because their wavelength is far longer. Rather than appearing as a breaking wave, a tsunami may instead initially resemble a rapidly rising tide, and for this reason they are often referred to as tidal waves. Tsunamis generally consist of a series of waves with periods ranging from minutes to hours, arriving in a so-called wave train.[4] Wave heights of tens of meters can be generated by large events. Although the impact of tsunamis is limited to coastal areas, their destructive power can be enormous and they can affect entire ocean basins; the 2004 Indian Ocean tsunami was among the deadliest natural disasters in human history with over 230,000 people killed in 14 countries bordering the Indian Ocean. The Greek historian Thucydides suggested in 426 BC that tsunamis were related to submarine earthquakes,[5][6] but the understanding of a tsunamis nature remained slim until the 20th century and much remains unknown. Major areas of current research include trying to determine why some large earthquakes do not generate tsunamis while other smaller ones do; trying to accurately forecast the passage of tsunamis across the oceans; and also to forecast how tsunami waves would interact with specific shorelines. Etymology (Literary meaning) Tsunamis are sometimes referred to as tidal waves. In recent years, this term has fallen out of favor, especially in the scientific community, because tsunamis actually have nothing to do with tides. The once-popular term derives from their most common appearance, which is that of an extraordinarily high tidal bore. Tsunami and tides both produce waves of water that move inland, but in the case of tsunami the inland movement of water is much greater and lasts for a longer period, giving the impression of an incredibly high tide. Although the meanings of tidal include resembling[8] or having the form or character of[9] the tides, and the term tsunami is no more accurate because tsunami are not limited to harbours, use of the term tidal waves discouraged by geologists and oceanographers. History Main article: Historic tsunami As early as 426 BC the Greek historian Thucydides inquired in his book History of the Peloponnesian War about the causes of tsunami, and was the first to argue that ocean earthquakes must be the cause.[5][6] The cause, in my opinion, of this phenomenon must be sought in the earthquake. At the point where its shock has been the most violent the sea is driven back, and suddenly recoiling with redoubled force, causes the inundation. Without an earthquake I do not see how such an accident could happen.[14] The Roman historian Ammianus Marcellinus (Res Gestae 26.10.15-19) described the typical sequence of a tsunami, including an incipient earthquake, the sudden retreat of the sea and a following gigantic wave, after the 365 AD tsunami devastated Alexandria.[15][16] While Japan may have the longest recorded history of tsunamis, the sheer destruction caused by the 2004 Indian Ocean earthquake and tsunami event mark it as the most devastating of its kind in modern times, killing around 230,0 00 people. The Sumatran region is not unused to tsunamis either, with earthquakes of varying magnitudes regularly occurring off the coast of the island.[17] Generation mechanisms The principal generation mechanism (or cause) of a tsunami is the displacement of a substantial volume of water or perturbation of the sea.[18] This displacement of water is usually attributed to either earthquakes, landslides, volcanic eruptions, glacier calvings or more rarely by meteorites and nuclear tests.[19][20] The waves formed in this way are then sustained by gravity. Tides do not play any part in the generation of tsunamis. Tsunami generated by seismicity Tsunami can be generated when the sea floor abruptly deforms and vertically displaces the overlying water. Tectonic earthquakes are a particular kind of earthquake that are associated with the Earths crustal deformation; when these earthquakes occur beneath the sea, the water above the deformed area is displaced from its equilibrium position.[21] More specifically, a tsunami can be generated when thrust faults associated with convergent or destructive plate boundaries move abruptly, resulting in water displacement, owing to the vertical component of movement involved. Movement on normal faults will also cause displacement of the seabed, but the size of the largest of such events is normally too small to give rise to a significant tsunami. The energy released produces tsunami waves. Tsunamis have a small amplitude (wave height) offshore, and a very long wavelength (often hundreds of kilometers long, whereas normal ocean waves have a wavelength of only 30 or 40 metres),[22] which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 millimetres (12 in) above the normal sea surface. They grow in height when they reach shallower water, in a wave shoaling process described below. A tsunami can occur in any tidal state and even at low tide can still inundate coastal areas. Tsunami generated by landslides In the 1950s, it was discovered that larger tsunamis than had previously been believed possible could be caused by giant landslides. Underwater landslides that generate tsunamis are calledsciorrucks.[23] These phenomena rapidly displace large water volumes, as energy from falling debris or expansion transfers to the water at a rate faster than the water can absorb. Their existence was confirmed in 1958, when a giant landslide in Lituya Bay, Alaska, caused the highest wave ever recorded, which had a height of 524 metres (over 1700 feet). The wave didnt travel far, as it struck land almost immediately. Two people fishing in the bay were killed, but another boat amazingly managed to ride the wave. Scientists named these waves megatsunami. Scientists discovered that extremely large landslides from volcanic island collapses can generate megatsunamis that can cross oceans. Meteotsunamis Some meteorological conditions, such as deep depressions that cause tropical cyclones, can generate a storm surge, called a meteotsunami, which can raise tides several metres above normal levels. The displacement comes from low atmospheric pressure within the centre of the depression. As these storm surges reach shore, they may resemble (though are not) tsunamis, inundating vast areas of land.[24]

Essay --

Aliza Lichy Ms. Hoff American Government 1/15/2014 The Importance of a Strong Middle Class Having a strong middle class indicates that America’s democracy will be effervescent and its economy will be beneficial, which will lead to the notion of precisely what America is all about. The setback is that the weakness of America’s middle class not only harms those affected by it, but all other individuals living in the U.S as well. America’s incomes are deteriorating or weakening, while items necessary to live increase in cost, and the probabilities of falling behind are beginning to develop. It is important that the gap between the upper class and the lower class is condensed, this way a strong middle class will be emitted. The modern persona of middle class citizens in America derives from the post World War II era. In 1944, the GI Bill was created to provide returning veterans with money to cover college, business, and home mortgages. This money gave servicemen the opportunity to afford a home of their own for the first time ever resulting in the vast pr oliferation of residential construction. This was how American subdivision commenced (Suddath). The fault in the subdivision initiated when the strong gap between the upper class and the lower class formed due to income inequality, race and gender disparities, education, and technology. The American government is working to rejuvenate the middle class and shorten the gap between the upper and lower class. In 2012, Vice President Joe Biden stated, "America's middle class is hurting, it is our charge to get the middle class — the backbone of this country — up and running again" (â€Å"A Strong† n.d.). The revitalization of America’s middle class is possible. In order to do so, the costs ... ...ny other ways that income is received consistently. Race and gender disparities are also a cause of the gap. The â€Å"gender earnings gap† in America as well as the â€Å"Gender Wage Gap† are other names for the difference in a male and females income year round. This information is gathered and used by economists and federal agencies as part of the current population survey. In 2010 the median income of year round workers was $42,800 for men, compared to $34,700 for women. The ratio of money earned was 0.81, reaching a somewhat higher ratio than that of 2008. The female-to-male earnings ratio of 0.81 means that, in 2009, female FTYR workers earned 19% less than male FTYR workers. The determination of the difference in income does not include the experience, education, skill, qualification, and more of the males and females as long as its full time (â€Å"Income inequality†).

Recruitment Case Study Essay

_________ affect recruitment policies because firms often give preference to current employees in promotions, transfers, and other career-enhancing opportunities. Typically, the first step in an employee’s introduction to company policies, practices, and benefits is a (n) _________ program. Which of the following statements about an aging organization is true? The information least likely to be obtained in reference checks and recommendations is: The step following recruitment is ________, which is basically a rapid, rough selection process. The role of organizational culture in staffing is best applied if companies: When implementing recruitment activities, initial consideration should be given to a company’s __________, especially for filling jobs above the entry level. Promotion-from-within policies must ______________, coupled with a company philosophy that permits employees to consider available opportunities within the organization. Read more:  Recruitment Case Study Recruitment begins by specifying __________, which are the typical result of job analysis and workforce planning activities. Which of the following statements about a company using a passive nondiscrimination posture is true? A soft-quota system: Which of the following is a concerted effort by the organization to actively expand the pool of applicants so that no one is excluded because of past or  present discrimination? Which law gives students the legal right to see all letters of recommendation written about them and also permits release of information about a student only to people approved by the student at the time of the request? Which act requires third-party investigators to secure the applicant’s written consent prior to doing a background check? This type of management style is often associated with organizations in the embryonic stage.

Hamlet theme of appearance vs. reality Essay - 896 Words

Shakespeare examines the theme of appearance and reality in his book-Hamlet. The dilemma of what is quot;realquot; is established at the very beginning of the play. Hamlet doesn’t know what to believe and devises a plan to find out. The old king Hamlet appears to be bitten by a snake, but in reality he was poisoned, the ghost appears as an apparition, but it’s actually real, and the play-with-in-a-play strongly depicts the theme of appearance vs. reality. nbsp;nbsp;nbsp;nbsp;nbsp;The dead King appears to have been bitten by a snake. In reality, he has been poisoned. Everyone believes that the king died from snakebite, but once Hamlet knows the truth he is unsettled by the revelation. When Hamlets dead father directs his son to,†¦show more content†¦70-80). This theme of appearance vs. reality will play an important part in the entire play. Another example of appearance vs. reality is the Ghost that appears as an apparition from the depths of hell, when actually he is the medium of reality, revealing the facts to Hamlet. The ghost tells Hamlet that his father was murdered, â€Å"Revenge his foul and most unnatural murder† (1.5. 25). Since Hamlet doubts the sincerity of the Ghosts revelation, he decides to put on the appearance of being mad to see if this is true, â€Å"I’ll wipe away all trivial records †¦and they commandment all alone shall live† (1.5. 99-102). Hamlets decision to simulate madness as a means of enacting his revenge is important. The news that Hamlet received about his father and his mother could drive anyone insane. As a result, the line between appearance and reality becomes notably distorted as the play progresses. Guildernstern says in Act 3 lines7-9, â€Å"But with a crafty madness keeps aloof when we would bring him on to some confession of this true state.† At tim es it also seems that Hamlets appearance of madness has become a reality, (3.1. 201-203) â€Å"You should not have believed me, for virtue cannot so inoculate our old stock but we shall relish of it. I loved you not.† Hamlet loved Ophelia so this is definitely not true, but during the course of the play, his madness seems so genuineShow MoreRelatedHamlet Theme of Appearance vs. Reality961 Words   |  4 PagesShakespeare examines the theme of appearance and reality in his book-Hamlet. The dilemma of what is real is established at the very beginning of the play. Hamlet doesnt know what to believe and devises a plan to find out. The old king Hamlet appears to be bitten by a snake, but in reality he was poisoned, the ghost appears as an apparition, but its actually real, and the play-with-in-a-play strongly depicts the theme of appearance vs. reality. The dead King appears to have been bittenRead MoreAPPEARANCE vs. REALITY IN THE PRINCE AND HAMLET1614 Words   |  7 Pages3. Reality and appearances, or if you prefer, being and acting, are important themes for both Machiavelli and Shakespeare. Why? How do their perspectives on this subject agree or differ? APPEARANCE vs. REALITY IN THE PRINCE AND HAMLET One of the most fundamental questions in philosophy is the appearance vs. reality. We find ourselves asking the question of what is genuinely real, and what is viewed merely as just an appearance, and not real? 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In many situations, honesty and sincerity appear to be present; however, in reality, dishonesty and deception are usually the character’s true intentions. Specifically, Rosencrantz and Guildenstern, Hamlet, and Claudius demonstrate the disconnect between appearance versus reality. Throughout the play, these charactersRead More Hamlet - Appearence Vs Reality Essay example830 Words   |  4 Pages Appearence vs Reality Possibly the best piece of writing ever done by William Shakespeare, Hamlet, is a classic example of a tragedy. In all tragedies the hero suffers, and usually dies at the end. Romeo and Juliet commit suicide, Brutus falls on his sword, and like them Hamlet dies by getting cut with a poison tipped sword. The theme that remains constant throughout the play is appearance versus reality. 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The theme of appearance versus reality surrounds Hamlet due to the fact that the characters portray themselves as one person on the outside, and one different on the inside. In the play, ClaudiusRead MoreEssay about Appearance vs. Reality in William Shakespeares Hamlet1007 Words   |  5 PagesAppearance vs. Reality in William Shakespeares Hamlet In Hamlet, one of Shakespeares greatest tragedies, there is a prevailing theme that is concurrent throughout the play. Throughout the play, all the characters appear to be one thing on the outside, yet on the inside they are completely different. The theme of appearance versus reality is prominent in Hamlet because of the fact that the characters portray themselves different from what they really are. In the playRead MoreEssay about Appearance vs. Reality in Shakespeares Hamlet497 Words   |  2 PagesAppearance vs. Reality in Shakespeares Hamlet In Hamlet deceiving illusions are frequently used to protect truth from being a destructive force. 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