EOSC 114 – Final Review Notes Get A’s or die trying. Jason Kim Unit 1: A Fragile System At least 3 earthquake recording stations are required to find the location of the earthquake epicenter. A single recording station can only calculate distance‚ but not direction; to cover all possibilities‚ a complete circle is drawn around that station. If only two earthquake recording stations are used‚ the circles will overlap at two points. Data from a third recording station will eliminate one of
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history is represented by volcanic and sedimentary strata of Oligocene age‚ ranging to Pleistocene coral limestone and alluvium. THE CARIBBEAN is a geologically complex region that displays a variety of plate boundary interactions including subduction in the Lesser Antilles and Central America‚ transcurrent (strike-slip) motions on the northern and southern boundaries‚ and sea floor spreading in the Cayman Trough. The central Caribbean is a lithospheric plate consisting mainly of an anomalously
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located on a destructive plate boundary | | |N. American Plate (continental crust) and Juan de Fuca plate (Pacific plate(oceanic crust) collided – a subduction zone | | |Pacific plate is sub ducted and pressure/heat causes rock to "melt" into magma | | |increased pressure caused Mt St Helens to erupt
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1. What are the relationships among Earth’s mantle‚ crust‚ astheno sphere‚ and lithosphere? The lithosphere is basically the strong outer shell of earth. It is roughly 100km thick depending on its age‚ and is broken into plates‚ known as the tectonic plates. Within the lithosphere is the crust as a portion of the upper mantle. The crust is the outer most portion of the earth and takes up less than 1% than the total volume of the earth. It is commonly compared to the skin of an apple‚ whereas
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------------------------------------------------- Erupted material Pāhoehoe lava flow on Hawaii. The picture shows overflows of a main lava channel. The Stromboli stratovolcano off the coast of Sicily has erupted continuously for thousands of years‚ giving rise to the termstrombolian eruption. Lava composition Another way of classifying volcanoes is by the composition of material erupted (lava)‚ since this affects the shape of the volcano. Lava can be broadly classified into 4 different
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deposits‚ called red beds‚ are characteristic of the continental margins in divergent boundaries. Describe the Characteristic features found at convergent plate margins. Convergent boundaries are boundaries at which crust is destroyed by the subduction of oceanic crust beneath continental crust or other oceanic crust. Convergent boundaries contain the broadest array of geologic activities. The movement of oceanic crust beneath another crustal plate results in heating of materials that are dragged
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Tsunami EENS 3050 Tulane University Natural Disasters Prof. Stephen A. Nelson Tsunami This page last updated on 02-Jul-2012 Up until December of 2004‚ the phenomena of tsunami was not on the minds of most of the world’s population. That changed on the morning of December 24‚ 2004 when an earthquake of moment magnitude 9.1 occurred along the oceanic trench off the coast of Sumatra in Indonesia. This large earthquake resulted in vertical displacement of the sea floor and generated a tsunami that
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The Geological and Biological Origins of New Zealand Introduction New Zealand has a unique landscape with many animals and plants that are native only to itself. The purpose of this essay is to discuss the geological history of the formation‚ as well as the biological origins‚ of New Zealand. It will also discuss how the major land-forming processes of volcanism‚ glaciation and tectonic plates have shaped the country and defined it’s native flora and fauna. Eighty-five million years ago the
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Formation of Volcanic Islands When people think of volcanoes‚ most would imagine a deadly explosion of liquid hot magma that ruthlessly obliterates anything in plain view. If volcanoes demolish everything in sight then how did life become what it is today? Volcanoes are not just a source of destruction and mayhem‚ long before civilization‚ while the earth was still being developed its apocalyptic surface consisted of nothing but molten rock and volcanic eruptions were a common occurrence; it was
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just 1cm a year. At a destructive plate margin‚ plates move towards each other. When an oceanic crust meets a continental crust‚ the denser oceanic crust is forced under the continental plate and melts due to friction and high pressure in the subduction zone. The pressure builds up and is released suddenly‚ creating earthquakes. Subsequently‚ the continental plate is crumpled by the pressure and fold mountains are formed. An example of a fold mountain is the Andes. When two oceanic plates converge
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