two converging plates is known as a destructive plate margin‚ as it is responsible for more violent seismic activity‚ volcanoes and high mountain ranges. Destructive Plate Margins Destructive plate margins can either result in collision zones or subduction zones. When a plate of oceanic lithosphere comes into contact with a continental plate the oceanic plate is subducted beneath the continental plate due to the higher density of the oceanic crust. This can sometimes form what is known as a volcanic
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|31-Oct-11 |Sea floor spreading rates + Mantle Plumes | | |07-Nov-11 |Subduction zone tectonics – structure + seismology. | | |14-Nov-11 |Subduction related magmatism‚ metamorphism. | | |21-Nov-11 |Continental Collision zones – Himalayan geology
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36450 people. At 1.30pm on the same day the waves hit Pothuvil‚ Panama‚ Hambantota‚ Galle in southeastern coastal towns of Sri Lanka . The mountain is located in unique area at transition between frontal subduction of Indian-Australian plate and Eurasia plate to the south of Java and oblique subduction to the west of Sumatra. The recent Tsunami originated by the undersea earthquake on the northern tip of this fault line has again hit Sri Lanka. It is incorrect to say that Sri Lanka is free from natural
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long mountain chain running the length of the Pacific plate of South America‚ are caused by subduction of the earth’s crust. Subduction is caused when two continents collide resulting in rock formation. El Mirador‚ one of the most famous peaks‚ is a mountain in that chain. It contains elements found in all molten rock such as basalt and lava. Scientist are convinced that El Mirador is a product of the subduction process. 7. In their never-ending quest to seek more efficient killing methods‚ scientists
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the graph below: 9. According to the figure above‚ which of the following types of plate boundaries produce the deepest earthquakes? A) transform fault boundary B) divergent boundary C) continental collision boundary D) subduction zone boundary E) all the
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Geological of the western interior during the Mesozoic Era Abstract The Mesozoic Era “the middle life” is the second major Era that lies between the Paleozoic Era and the Cenozoic Era. Geologist believe that this Era took place from 248 to 65 million years ago. The earth during this time was different from what we know today. The shape of the earth and life during this time period has changed dramatically. Starting with an overview of the Mesozoic Era and its subdivisions periods I will focus
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the mantle when the two different types of plate converge at a destructive plate boundary. As shown in the diagram above‚ the denser oceanic crust of the Pacific Plate is forced underneath the continental Eurasian Plate at an angle to form a subduction zone with an associated deep sea trench. As the oceanic lithosphere descends‚ the pressure relaeased can also cause major earthquakes. These earthquakes can happen on land or under the ocean; Tsunamis (such as Krakatoa 1883) caused by submarine
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Plate Tectonics Ever since the beginning on time‚ Humans believed the ground is solid and immobile. But this is not true whatsoever. The Earth is every-changing and continually in motion. The stability of the Earth is not at all what we think it is. Thinking about the rotational axis of the Earth‚ and possibly of what the Earth may become at a certain point in time‚ has a great influence on understanding all aspects of living things‚ either in the past‚ present‚ or future. The study of Plate
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A example of a regular volcanic eruption caused by a ‘Hawaiian’ Volcano is Kīlauea which has been continuously erupting since January 1983‚ and has causes no loss of life. Looking at the proprieties of the magma explains why eruptions along subduction plate boundaries product more ‘hazardous’ eruptions‚ and this is one of the reasons that a volcano becomes more hazards because the more viscous a material is the more pressure build up will occur within the volcano‚ causing more explosive eruptions
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SEDIMENTARY BASINS - AN INTRODUCTION Definition of a sedimentary basin: A sedimentary basin is an area in which sediments have accumulated during a particular time period at a significantly greater rate and to a significantly greater thickness than surrounding areas. (Compare with physiographic basin - a depression in the surface of the land or sea-floor that may or may not be infilled with sediments). Sedimentary basins of one type or another today cover about 70% of the Earth’s surface and contain
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