In the Rising Storm comic, it is revealed that Shockwave crashlanding on Earth is what caused the Tunguska event. Tunguska event is minimum 3 megaton, maximum 30 megaton (according to a 2019 paper).
According to the writer, Tunguska event was apparently in Shockwave's production bio, so it's not something he randomly came up with.
Canonicity of this comic:
TLK only invalidated the 2007 movie prequel comic and the Ghosts of Yesterday novel. The condradiction is that in the comic and novel, Bumblebee arrives on Earth in 2003, while in TLK, he was already on Earth during WW2.
Nothing prevents other comics from being fully canon. In fact, Bumblebee movie Prequel comic implies that Rising Storm is still canon by featuring Shockwave's assistant Astrotrain, who even namedrops Shockwave in the Bee prequel comic. This comic does not fit the Bumblebee movie but it does fit the Bayverse timeline, and Bumblebee movie is a different continuity to the Bayverse to begin with.