$10.00 Nice essay you can revise with types of plate margins and references
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- Posted on Aug 31, 2008 at 7:20:53PM
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Preview: ... there are four types of seismic zones. The first follows the line of midocean ridges. Activity is low, and it occurs at very shallow depths. The point is that the lithosphere is very thin and weak at these boundaries, so the strain cannot build up enough to cause large earthquakes. Associated with this type of seismicity is the volcanic activity along the axis of the ridges (for example, Iceland, Azores, Tristan da Cunha). <br>The second type of earthquake associated with plate tectonics is the shallow-focus event unaccompanied by volcanic activity. The San Andreas fault is a good example of this, so is the Anatolian fault in Northern Turkey. In these faults, two mature plates are scraping by one another. The friction between the plates can be so great that very large strains can build up before they are periodically relieved by large earthquakes. Nevertheless, activity does not always occur along the entire length of the fault during any one earthquake. For instance, the 1906 San Francisco event was caused by breakage only along the northern end of the San Andreas fault. <br>The third type of earthquake is related to the collision of oceanic and continental plates. One plate is thrust or subducted under the other plate so that a deep ocean trench is produced. In the Philippines, ocean trenches are associated with curved volcanic island arcs on the landward plate, for example the Java trench. Along the Peru - Chile trench, the Nazca plate is being subducted under the South American plate which responds by crumpling to form the Andes. This type of earthquake can be shallow, intermediate, or deep, according to its location on the downgoing lithospheric slab. Such inclined planes of earthquakes are know as Benioff zones. <br>The fourth type of seismic zone occurs along the boundaries of continental plates. Typical of this is the broad swath of seismicity from Burma to the Mediterranean, crossing the Himalayas, Iran, Turkey, to Gilbraltar. Within this zone, shallow earthquakes are associated with high mou ...
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$15.00 Earthquakes and Plates
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- Posted on Aug 31, 2008 at 9:26:45PM
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Preview: ... lled conservative because plates are neither added to nor destroyed at their margins. The plates slide past each other laterally (Fowler, 1990). One prime example of a transform fault boundary is that of the San Andreas Fault in California. The myth that someday California will fall into the Pacific Ocean is impossible because the Pacific plate is sliding north relative to the North American Plate. The only change we could see is that the land to the west of the fault will keep creeping to the north.<br>Earthquakes generally occur at the plate margins and boundaries because of the differential movement along the plates. The movement of the plates against each other is not smooth. Stress builds up along the boundary resulting in strain or deformation of the plates. Finally the strain builds to a point that cannot be continued and the rocks slip past each other, the stored strain energy is released, resulting in the propagation of seismic waves from the point of the slip (Bolt, 2003).<br><br><br>Earthquake Motion<br>When the Earth begins to quake, there are several things happening at once. Seismic waves begin propagating out fro ...
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Earthquakes and plates.doc (35K) (Preview)
$9.00 Earthquakes"
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- Posted on Sep 11, 2008 at 8:22:59PM
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Preview: ... as a pliable ball of molten rock. The outer layer is what we refer to as the crust. The crust is very thin when compared to the other layers of the Earth. For example, think of the outer layer of an orange as it relates to the interior of the orange. This example relates closely to what the Earth looks like when we examine the crust. The crust and other layers floats upon the mantle core. The crust of the earth is made up of multiple pieces. Each of these giant pieces is called a tectonic plate. <br>What are the events that cause the Earth to quake and shake? The movement of the continental crust as two tectonic plates collide causes one of the plates to sub-duct under the other causing lots and lots of tension. In the process of these plates pushing against one another, the rigid faces of the plates rub until a piece of one of them breaks off causing the plate to suddenly move and create what is known as an earthquake. The plates then snap back together. This is known as the elastic rebound theory. There are other reasons for earthquakes besides one plate sub-ducting under another. There are also fault planes were you could have plates sliding against each other and mid-plate earthquakes. (Britannica, 2008)<br> Where do these earthquakes happen? Most earthquakes occur along the edges of the continental and oceanic plates. Fifty p ...
The full tutorial is about 1078 words long .
$10.00 Earthquakes
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- Posted on Sep 16, 2008 at 3:32:51PM
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Preview: ... not necessarily have to happen at plate boundaries, although those are the most likely sites. Earthquakes can happen in the middle of a plate where there is a fault. Probably the most famous one was the New Madrid earthquake which occurred in the early 1800's with an estimated magnitude 8. The major faults with a high amount of activity are plate related, but faults occur in many places for other reasons - for example, as mountains erode, they get lighter and the plains collecting the silt get heavier - at some point a weak line is going to shift and an earthquake will be felt. The huge layers of ice from the ice aged glaciers depressed the earth under them and many areas are still doing strain relief now that the ice is gone.<br>Page Three<br><br> Plate tectonics is a relatively new science. We are learning that the surface of the earth is made up of floating plates that move around against each other. Most of the volcanoes and earthquakes in the world happen along the boundaries between these plates. In fact that is how we know about them. If a person would make a map of where all the major earthquakes have happened over the last 50 years, it basically draws the outlines of the plates. The frequency of Earthquakes is determined by the stress and strain along fault planes of which occur at plate boundaries and usually anywhere there are rocks. The occurrence of an earthquake is determined by the maximum stress at a given point along the fault plane. Some parts of the fault plane potentially are weaker than others.<br> There are an abundance of things we can do to minimize the damage caused by earthquakes, and the more we l ...
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Earthquakes.doc (37K) (Preview)
$8.50 Earth's Plates and Their Motion- Paper
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- Posted on Sep 27, 2008 at 07:14:59PM
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Preview: ... of a transform fault boundary is that of the San Andreas Fault in California. The myth that someday California will fall into the Pacific Ocean is impossible because the Pacific plate is sliding north relative to the North American Plate. The only change we could see is that the land to the west of the fault will keep creeping to the north.<br><br>Earthquakes generally occur at the plate margins and boundaries because of the differential movement along the plates. The movement of the plates against each other is not smooth. Stress builds up along the boundary resulting in strain or deformation of the plates. Finally the strain builds to a point that cannot be continued and the rocks slip past each other, the stored strain energy is released, resulting in the propagation of seismic waves from the point of the slip.<br><br><br>Earthquake Motion<br><br><br>When the Earth begins to quake, there are several things happening at once. Seismic waves begin propagating out from the center or focal point of the earthquake. Some of the waves only travel along or near the surface of the Earth while others travel through the body of the Earth. The waves slow down or speed up depending on the material that they are p ...
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Earth's Plates and Their Motion.doc (34K) (Preview)
$15.00 Earthquakes
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- Posted on Sep 28, 2008 at 11:26:59PM
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Preview: ... ved that grade otherwise I wou ...
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$12.00 Received 100/100 points on the assignment
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- Posted on Jan 21, 2009 at 9:17:36PM
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Preview: ... man named Charles Richter. This scale is based on record heights, or amplitudes of seismic waves recorded on a seismograph. The Richter magnitude scale is based on a logarithmic scale (base 10). What that means is that for each whole number you go up, the amplitude of the ground motion recorded by a seismograph goes up by ten times. Most of the earthquakes that occur each year are a magnitude of 2.5 or less and are too small to be felt by most people. The Richter scale can also be used to detect earthquakes in the negatives as well as earthquakes 10.0 and higher. The Movement magnitude scale is also used to measure earthquakes. The Movement magnitude scale measures the strength of the earthquake based on the rupture size, rock properties, and amount of displacement on the fault service.<br>Earthquakes can happen anywhere but are most common along tectonic plate boundaries. Wherever the tectonic plates that make u ...
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SCI245 Week 3 - Earthquakes.doc (33K) (Preview)
$15.00 here is what you are looking for A+ answers NEW NOT yet sold
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- Posted on Jul 18, 2009 at 8:53:43PM
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Preview: ... ou are looki ...
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SCI 245 Earthquakes.doc (31K) (Preview)
$6.99 Complete Answer, APA formatted, Almost 1,200 words! A+
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- Posted on Jul 20, 2009 at 2:57:11PM
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Preview: ... se see t ...
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