Explaining Earthquakes : QUEST
Seismologist then found that the Richter magnitude and other magnitudes related just to maximum motions of different parts of the seismic wave did not adequately measure the size of very large earthquakes. How did they know that it was an earthquake? What did they feel? What did they hear? Have students make a list of questions they have about earthquakes
The mid-century hero of Plate Tectonics was Harry Hess, whose magnetometer data collected near the midocean ridges revealed mirror-image stripes of reversing magnetic orientation imprinted on oceanic crust as it was extruded from the spreading centers and moved away from them. So Plate Tectonics indeed holds that there was convergence of continents around the Pacific, but asserts that the convergences occurred at different times
Fresh lava glows red hot to white hot as it flows.Why does lava take a long time to cool down?Lava cools slowly because lava is a poor conductor of heat. Mount Fuji is now a popular tourist location with a large number of climbers actively scaling the mountain top.What is a tsunami? A tsunami is a large ocean wave usually caused by an underwater earthquake or a volcanic explosion
Plate Tectonics - examples, body, process, Earth, type, form, energy, surface
5 abbeyJan 25, 2008 @ 6:06 amhi! this is great! i love it, almost as much as i love science in general there should be loads more sites like this one! :D 6 Elo CMar 14, 2008 @ 2:02 amthis isn't really a comment but more of a question... but isn't the pacific plate an oceanic plate? i'm confused about the san andreas fault:( 7 hhMar 16, 2008 @ 2:02 amsince the earth plate is moving,is the earth expanding? 8 riqahMar 20, 2008 @ 8:20 pmi soooooooo like agree with all of the above..
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Plate Tectonics
He proposed that prior to about 200 million years ago all of the continents formed one large land mass that he called Pangea (see figures on pages 56 to 59 in your text). For each of the following types of plate boundary, describe exactly what is present and what happens at the boundary: (a) divergent boundary, (b) convergent boundary, (c) transform boundary
Reading Quiz Resources Did you know? Did you know that earthquakes and volcanic eruptions do not happen in random places? Both are concentrated along the boundaries of tectonic plates and provide evidence for the theory of plate tectonics. Ironically, however, the question that incited ridicule for Wegener continues to launch heated debate today: What ultimately drives plate motion? Plates are constantly shifting and rearranging themselves in response to each other
Earthquakes - average, low, world, daily, high, days, Why earthquakes occur, Measuring an earthquake, Understanding earthquakeswhy they are always a surprise
This earthquake belt was responsible for 70,000 deaths in Peru in May 1970, and 65 deaths and one billion dollars of damage in California in February 1971. Magnitude expresses the amount of energy released by an earthquake as determined by measuring the amplitudes produced on standardized recording instruments
(Worse yet, subducting plates would obstruct mantle circulation.) Could one cell circulate under each plate? A large plate, such as the Pacific plate, would need to have a much larger cell width than a plate one-thousandth as large. Most experts will admit that the geodynamo theory has many problems, and many experimental efforts have not been able to produce a realistic dynamo.107 60
What Causes Earthquakes?
Of late, there have been many natural disasters that can be associated with earthquakes, such as the Tsunami that hit the shores of India and Southeast Asia in 2004, and caused total annihilation. According to expert studies, this has an effect on the surrounding crustal portions, leading to earthquakes, especially if structural weaknesses like faults and dikes are present in the lithology
What we have in mind is, ideally, to have dozens of these, up and down the coastline, so that all of the low-lying communities with tsunami hazards have these to protect their people. NARRATOR: The last lethal quake on the San Andreas fault system was the 1994 Northridge earthquake, which killed over 60 people and caused 20 billion dollars of damage
Plate boundaries
Subduction also is the cause of the volcanic activity in places like Japan: as the downgoing slab goes deeper beneath the overriding plate, it becomes hotter and hotter because of its proximity to the mantle. Convergent boundaries also explain why crust older than the Cretaceous cannot be found in any ocean basin-- it has already been destroyed by the process of subduction
Earth Floor: Plate Tectonics
The theory states that Earth's outermost layer, the lithosphere, is broken into 7 large, rigid pieces called plates: the African, North American, South American, Eurasian, Australian, Antarctic, and Pacific plates. The plates are all moving in different directions and at different speeds (from 2 cm to 10 cm per year--about the speed at which your fingernails grow) in relationship to each other
Geologists believe that, if spreading continues, the three plates that meet at the edge of the present-day African continent will separate completely, allowing the Indian Ocean to flood the area and making the easternmost corner of Africa (the Horn of Africa) a large island. Picture two giant conveyor belts, facing each other but slowly moving in opposite directions as they transport newly formed oceanic crust away from the ridge crest
Hawaiian-type eruptions are rarely life threatening because the lava advances slowly enough to allow safe evacuation of people, but large lava flows can cause considerable economic loss by destroying property and agricultural lands. Mid-plate earthquakes -- those occurring in the interiors of plates -- are much less frequent than those along plate boundaries and more difficult to explain
Where do most earthquakes occur in the world
Slightly more than one week later, a more intense quake shook the Grand Canyon hard enough to wake campers and rattle nearby houses.On January 16, 1950, an earthquake centered in Apache County tore cracks in the ground throughout the tiny town of Ganado, Arizona. Do you prefer playing a variety of characters or would you rather play a single character for multiple seasons? View Full Interview Margaret Wright 68 Contributions Updated Answer In Earthquakes Where do the most earthquakes occur explain your answer? Most earthquakes occur along fault lines, caused by plate tectonics
Where Do Earthquakes Happen?
This time, the 'footwall' is on the 'downthrown' side of the fault, moving downwards, and the 'hanging wall' is on the 'upthrown' side of the fault, moving upwards
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