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Essay / Research Paper Abstract
This 5 page paper discusses the devastating earthquake in Mexico City in 1985 from a geological perspective. Bibliography lists 4 sources.
Page Count:
5 pages (~225 words per page)
File: D0_HVmexquk.rtf
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of this paper is to discuss the prevalence of earthquakes in the region, the type of damage done and the geological reasons for it and the geology of the region
in general. Background Material Because it sits on three tectonic plates, Mexico is "one of the most seismologically active regions on earth" (Merrill and Mir?, 1996). The majority of the
Mexican landmass sits atop the North American plate, which is moving toward the west (Merrill and Mir?, 1996). Off southern Mexico, the floor of the Pacific Ocean is moving northeast,
riding on the Cocos plate (Merrill and Mir?, 1996). The ocean floor material is heavier than that of the landmass, with the result that when the plates collide, the ocean
floor is "forced under the landmass, creating the deep Middle American trench that lies off Mexicos southern coast" (Merrill and Mir?, 1996). The process is called subduction, and it results
in frequent earthquakes near the southern Mexican coast (Merrill and Mir?, 1996). In addition, subduction causes the rocks of the ocean floor to melt and the molten rock is "forced
up through weaknesses in the surface rock, creating the volcanoes in the Cordillera Neovolc?nica across central Mexico" (Merrill and Mir?, 1996). The Basin is bounded by the Sierra Nevada on
the east, the Sierra de las Cruces on the west and the Sierra Chichinautzin to the south" (Aquifer, 1995). The Sierra Chichinautzin is a fairly recent chain, formed by eruption
approximately 600,000 years ago; when these mountains rose they "blocked what was primarily a southerly drainage and effectively closed the basin" (Aquifer, 1995). Description Mexico City is located in the
Basin of Mexico, a large depression located in the "central part of the Trans-Mexican Volcanic Belt" (Description of the Mexico City aquifer and its exploitation, 1995 - hereafter "Aquifer, 1995").
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