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The Earth Impact Database is the authoritative source for information on confirmed impact structures or craters on Earth. It was initiated in 1955 by the Dominion Observatory, Ottawa, under the direction of Dr. Carlyle S. Beals. It is now maintained as a not-for-profit source of information at the Planetary and Space Science Centre at the University of New Brunswick, Canada.〔(【引用サイトリンク】 publisher = University of New Brunswick )〕 The database currently (as of 2015) lists 188 confirmed impact sites.〔 Other comprehensive lists are wider in scope by including more than just confirmed sites, such as probable, possible, suspected and rejected/discredited impact sites on their lists. These are used for screening and tracking study of possible impact sites. The reason to retain rejected sites on such a list is because they may be, and often are, reported again. Sites will appear first in these lists while under study and may "graduate" to UNB's Earth Impact Database after confirmation and collection of enough information about the site to satisfy the database's strict entry criteria. * Impact Database (formerly Suspected Earth Impact Sites (SEIS)), Impact Field Studies Group (IFSG)〔 〕 * Catalogue of the Earth's Impact structures, Siberian Center for Global Catastrophes ==References== 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「Earth Impact Database」の詳細全文を読む スポンサード リンク
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