GeologyRocks

I've always been intrigued by the Tunguska event. Thanks for posting this

I thought the whole thing about Tunguska (as the website actually says) was that it was an airburst about 8km up and there was no impactor of any significant size. If there was a crater why wasn't it found at the time of the initial photos showing all the flattened trees?

The impact crater paper doesn't deny an airburst occured, but just says a small part of the body survived to create a small crater. As for finding the crater in the initial expeditions- the first of these was 13 years after the event, so it may be that the crater (if that is what it is) had been made significantly less conspicuous by water erosion etc. I'm not sure who is right- I guess it will have to wait til the 'object' found by the seismic profiling has been directly sampled before we'll know for sure.