Tunguska2008 recognition

A fir born before the Tunguska catastrophe.

Up to the Tunguska event, the growth rings of this fir increase regularly in all the directions giving rise to a nearly circular pattern. From the Tunguska catastrophe, we observe an accelerated growth and an asymmetry with a greater enhancement of the rings in the direction of their leaning. This phenomenom was studied in papers [1], [2] and [3] (Russian).

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