|
Wilkes Land crater is an informal term that may apply to two separate cases of conjectured giant impact craters hidden beneath the ice cap of Wilkes Land, East Antarctica. These are separated below under the heading Wilkes Land anomaly and Wilkes Land mascon (mass concentration), based on terms used in their principal published reference sources. ==Wilkes Land anomaly== A giant impact crater beneath the Wilkes Land ice sheet was first proposed by R. A. Schmidt in 1962 on the basis of the seismic and gravity discovery of the feature made by the U.S. Victoria Land Traverse in 1959–60 (VLT), and the data provided to Schmidt by J. G. Weihaupt, geophysicist of the VLT (Geophysical Studies in Victoria Land, Antarctica, Report No. 1, Geophysical and Polar Research Center, University of Wisconsin, 1–123).〔 〕 Schmidt further considered the possibility that it might be the elusive source of tektites from the Australasian strewnfield. The hypothesis was detailed in a paper by J. G. Weihaupt in 1976.〔 〕 Evidence cited included a large negative gravity anomaly coincident with a subglacial topographic depression across and having a minimum depth of . The claims were challenged by C. R. Bentley in 1979.〔 〕 On the basis of a 2010 paper by J. G. Weihaupt et al.,〔 〕 Bentley's challenge was proven to be incorrect, and the Earth Impact Database (Rajmon 2011) has now reclassified the Wilkes Land Anomaly from a "possible impact crater" to a "probable impact crater" on the basis of Weihaupt et al.'s paper. Several other potential impact crater sites have now been proposed by other investigators in the Ross Sea, West Antarctica, and the Weddell Sea. 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「Wilkes Land crater」の詳細全文を読む スポンサード リンク
|