Tunguska was a thermal stress explosion of an asteroid or comet in the earth's atmosphere, most likely a comet as no ground debris could be found later. It is now believed that a nearby small lake is the impact crater for the remaining core after the explosion. It happened in 1908.
The blast effects (which is all the question as worded asks about) would be the same as the blast effects of a weight of TNT identical to the nuclear bomb's yield (by definition). However a nuclear bomb has additional effects that the TNT doesn't, but as this question only asked about blast effects, I won't visit them.
Yes the tsunami did trigger the nuclear blast because the water got into the nuclear reactor and buggered it up
no
yes, thousands
Blast, always blast.
Correct answer is blast effect
none
35km
A direct nuclear blast - nothing. However it is said that cockroaches would possibly survive radiation where other animals would be killed.
blast
Twinkies
Blast