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The Vichada Structure is a probable impact structure along the Vichada River in Colombia (Vichada Department), South America. It is most likely the largest impact structure in South America.〔Planetary Society Researcher Max Rocca Discovers Largest Impact Crater in South America, A Target Earth update by Amir Alexander, February 13, 2010 http://www.planetary.org/programs/projects/targetearth/20100213.html retrieved 27 February 2010〕 The structure was discovered in 2004 by Max Rocca, a geologist in Buenos Aires, by examining Landsat imagery. He is supported by a grant from the Planetary Society. The structure consists of a central flat depression surrounded by two concentric rings of hills of approximately 30 and 50 km diameter. The Vichada River anomalously flows around the outer ring of hills. An international team of scientists collected aerial gravity data over the 50 km wide structure and discovered a positive free-air anomaly at the center of the structure, supporting its interpretation as an impact structure.〔Hernandez, O., et al., 2009, Geophysical evidence for an impact crater in Vichada, northwestern South America, and its economic potential, Earth Sci. Res. J., Vol. 13, No. 2 (December 2009): 97-107〕 ==See also== *List of impact craters in South America *List of impact craters on Earth 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vichada Structure」の詳細全文を読む スポンサード リンク
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