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The 1930 Curuçá River event was a meteoric air burst that occurred on 13 August 1930 over the area of Curuçá River in Brazil.〔〔 ==Overview== The event received little attention until 1995, when British astronomer Mark E. Bailey found in the Vatican Library archives a 1931 issue of ''L'Osservatore Romano'', which contained a dispatch from the Franciscan monk Fedele d'Alviano. D'Alviano had visited the region five days after the event and interviewed people from the region; they told him they were frightened of what had happened. According to Bailey, the Curuçá event was one of the most important impact events of the 20th century. Investigation of the data from the event suggests the meteor may have been related to the Perseid meteor shower, which occurs every August, peaking on 12 August.〔 Inspired by Bailey's article and based on images from Landsat satellites, the Brazilian astrophysicist Ramiro de la Reza was able to identify a potential astrobleme—the remains of a meteorite impact crater—measuring 1 km in diameter, to the southeast of Argemiro.〔 The Brazilian government has not organized a qualified expedition to investigate the event. Only a religious missionary and a small TV-financed expedition have investigated the event. In the first week of June 1997, de la Reza led an expedition organized by Rede Globo and co-financed by ABC Television of Australia, to the region where the event occurred. The expected crater was found, but evidence is still lacking attesting that it came from a meteor impact in 1930. A record from the seismological observatory of San Calixto in La Paz indicated that the crater may have been created on the same date.〔 However, a Mexican group in 2011 contended that the crater and the seismic record may not be related to the event.〔 The initial mass of the meteor has been estimated at between 1,000 and 25,000 tons.〔 Estimates for the energy released have varied from 9 kilotons,〔 100 kilotons,〔 and 5 megatons,〔 though most estimates place the energy at below 1 megaton.〔〔〔 Regardless, the event was significantly smaller than the 10–15 megaton Tunguska event. 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「1930 Curuçá River event」の詳細全文を読む スポンサード リンク
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