Numerical simulations of crater formation indicate a marine target (~800-m water depth) impact of a ≥400-m asteroid, resulting in a train of large tsunami waves and the potential release of substantial quantities of greenhouse gases from shallow buried black shale deposits. These include an elevated rim above a terraced crater floor, a pronounced central uplift, and extensive subsurface deformation. ![]() Seismic reflection data from the Guinea Plateau, West Africa, reveal a ≥8.5-km-wide structure buried below ~300 to 400 m of Paleogene sediment with characteristics consistent with a complex impact crater. ![]() Evidence of marine target impacts, binary impact craters, or impact clusters are rare on Earth.
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