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Vredefort隕石坑發生的時候有多深?



Vredefort Crater 是世界上最大的已知影響隕石坑之一。相對於原始地面高度,在塵埃剛剛沈降後,以及在任何侵蝕發生之前立即會有多深?

隕石坑直徑與初始深度之間是否存在一般關系?

轉載註明原文: Vredefort隕石坑發生的時候有多深?

一共有 1 個回答:

Therriault et al. (1993) suggest an initial diameter of 192-300km. Turtle & Piarazzo (1998) suggest a smaller initial diameter but make no estimates of the depth; they do, however, suggest an impactor of 10-14km diameter. Dietz (1961) describes the impact crater as "40km across and 16km deep" - i.e. does not take into account the extensive erosion that has occurred in this location. Grieve et al. (2008) also give no estimate of transient depth.

Numerical modelling of the impact diameter-crater depth relationship has been carried out: see e.g. Wünneman & Ivanov (2003), which also discusses crater morphology; meanwhile Turtle et al. (2003) suggest that for an impactor of 10km diameter the maximum transient crater depth will be 24km.

由於該地區2Ga的侵蝕歷史,似乎難以估計瞬變深度;因此,最好的選擇可能是呼籲,並假設Vredefort形成的影響服從與上文引用的作品中近期隕石坑人口模型相同的直徑 - 深度關系。