Plate Tectonics Press Release Public Education on Earthquake Preparedness By Krystle Wilson March 28, 2014 Los Angeles, CA – Earthquakes occurs frequently in Los Angeles and its surrounding areas in California. I would like to take some time today to discuss earthquake preparedness and discuss descriptions of hazards associated with earthquakes in Los Angeles. I will also discuss the origin and causes of earthquakes, relation to the shifting plates to the natural process of mountain
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position within the world and in relation to tectonic plate boundaries. For example you have highly destructive and explosive volcanoes often found along destructive plate boundaries because of increased pressure within the subduction zone. You also find volcanoes along constructive plate boundaries where the plates are moving apart and this is creating new lands and volcanoes as molten lava builds up. Also there are volcanic eruptions from hot spots within plates where there is a large amount of heat flow
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Introduction Plate tectonics is the main process that produces volcanoes, at subduction, convergent, and divergent zones. Yet, we see volcanic activity without the plate tectonics. “Hotspots” are found around the world. Many people who hear of the term hotspots, think of volcanoes and then the association of Hawaii, since it is a very common known hotspot. The Glossary of Geology (1987) defines “hotspots” as “a volcanic center, 100 to 200 km across and persistent for at least a few tens of millions
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P-wave velocity and increase in density -Keep in mind: Moho Drifting Continents and Spreading Seas Plate Tectonics: Unifying theory of geology developed in 1960’s, outer layer of Earth’s crust (lithosphere, lito = rock)consists of separate plates that move around. Explains locations of: earthquakes, volcanoes, mountain belts Antonio Snider-Pelleginer: says its all together (the plate) Alfred Wegener(1880-1930): first proposed the Hypothesis of Continetal drift: The Origin of the Continents
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Abstract Large igneous provinces are conspicuous features of late Phanerozoic geology, and include continental flood basalts, rifted continental margin volcanic sequences and oceanic plateaus. Many large igneous provinces can be associated with mantle plumes. Where plumes ascend beneath spreading ridges, their energy is transformed into a large melt volume, producing over-thickened plateau crust. Comparing the timing of mass extinctions with the formation age of large igneous provinces reveals a
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rocks into three major groups: igneous rock, sedimentary rock, and metamorphic rock Chapter 3 What happens to each Plate Boundaries? What geologic process? (Earthquake, volcano, Tsunami) Divergent plate boundary: Lithospheric plates move apart, subject to tensional stress. Many volcanic activity and earthquakes occurs at divergent plate boundaries. Convergent Plate Boundaries: Plates are moving toward each other, subjecting the rocks in the collision zone to compressive stress Transform Boundaries:
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PHSC107 L16-Rock deformation Detailed need to know What you need to know – get more detail on these areas from textbooks / readings – as detailed on moodle page. Crustal deformation – a process acting on the lithosphere. Driven by plate tectonics. Orogenesis –(mountain building – Oro = mountain) – large scale bending, breaking, stretching etc. Application of stress to rock • Change in shape = deformation strain. Brittle or plastic failure. • Creates joints, folds, faults, foliation
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Name Instructor Course Geography (and other Earth Sciences) 1. Which barrier island has moved more Assateague or Fenwick?: A) Assateague 2. Judging from this, which way is long shore drift in this area, north-to-south or south-to-north? A) south to North 3. Approximately how many feet (there are 5,280 feet in 1 mile) has the north end of Assateague Island moved during the past 70 years? C) About 2640 feet(0.5mile) 4. What's the rate of movement, in feet per year? A) About 40 feet per year
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struck offshore of Japan, along a subduction zone where two of Earth's tectonic plates collide. In a subduction zone, one plate slides beneath another into the mantle, the hotter layer beneath the crust. The great plates stick and slip, causing earthquakes. East of Japan, the Pacific plate dives beneath the overriding Eurasian plate. The temblor completely released centuries of built up stress between the two tectonic plates, a recent study found. The earthquake started on a Friday at 2:46 p.m.
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man visiting the island was a German soldier named Christopher Schweitzer (pg.46). According to his account, the sailors were collecting lightweight rocks, (pumice Stones) from the ocean in buckets (pg. 49) 2. The first rigorous mention of plate tectonics was published in the British journal Nature by J. Tuzo Wilson (pg. 99). 3. Captain Hollmann described the clod as follows: “we saw from the island a white cumulus cloud, rising fast. It rose almost vertically until, after about half an hour
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