The formation model of multi-ring basins based on the theory of impact tsunami

Astronomy and Astrophysics – Astronomy

Scientific paper

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Moon, Method: Analytical

Scientific paper

The tsunami model of the origin of multi-ring basins has been analysed with the theory of shallow water waves generated by an initial surface deformation, which is set as a parabolic crater. An approximate formula for calculating the ring radius has been derived. From the computed ring spacing of three multi-ring basins on the moon (Orientale, Moscoviense and Serenitatis South), it is shown that the tsunami model can only be applied to the area within the main ring (the IV ring), this agrees with the previous conclusion that the IV ring marks the end of fluidized region and the crater rim of the excavated basin. Besides this, by comparing the result of initial impulsive pressure disturbance with initial deformation disturbance under the condition of same fluidized depth, it seems that the time of multi-ring basins required to reach its present status in the case of initial deformation disturbance is shorter than the case of initial impulsive pressure disturbance, this time difference can be explained as the time required from the start of impact to the formation of a parabolic crater.

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