One more puzzle of the Tunguska catastrophe?

@article{Kasatkina2007OneMP,
  title={One more puzzle of the Tunguska catastrophe?},
  author={Elena A. Kasatkina and Oleg I. Shumilov},
  journal={JETP Letters},
  year={2007},
  volume={85},
  pages={216-219}
}
Using the results of the dendrochronological analysis (68 tree-ring chronologies), it has been shown that the increase in the annual growth of trees after the Tunguska bolide explosion on June 30, 1908, is observed at a large distance (more than 1500 km) from the explosion site (61° N, 102° E) and covers a huge area of about 2 × 106 km2 (60°–75° N, 80°–110° E). The anomalous growth of the trees was previously reported only for the direct-destruction area (about 2000 km2). A similar result was… 
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