Wednesday, August 4, 2010

[Geology2] How the Chile earthquake created miles of new, "uplifted" coastline



How the Chile earthquake created miles of new, "uplifted" coastline

Earlier this year, the 8.8 quake that hit Chile did more than level homes. It raised the ocean floor so much that undersea regions broke the surface of the water. Here are pictures of Chile's incredible new coastline.

Over the weekend, Science magazine published a report from a group of researchers in Chile, who measured the dramatic transformations in the Chilean landscape following the earthquake. The earth rose up so much along the southern coast of Chile that vast new land platforms were "uplifted," creating huge, lacy beaches covered in dying marine life.

According to Science:

[The] new study provides first-hand confirmation that the February earthquake ruptured a very long fault along the coast of Chile, but that its effects on coastal land varied; with a rise of land to a higher elevation in the South and an opposite sinking down of the Earth's surface in the North. The findings will help geologists and seismologists gain a deeper understanding of what triggers large earthquakes. In a Brevium, Marcelo Farías and researchers from Chile, France, and Germany report measurements from 33 sites related to the earthquake, all made within in a month of the rupture. The measurements reveal that uplift or and elevation of land occurred closer to the coast, while sinking occurred farther inward, toward land. This pattern is broadly similar to measurements made following many other great earthquakes, and is consistent with a fault slip that lies along a 500 km section of the Chilean coast that coincides with previous earthquakes in 1835 and 1928.

Read the full scientific paper via Science.

Images here at Source

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