Chelyabinsk event a couple of years ago, hundreds of pieces from grams to half-a-ton were recovered from the holes they made in the snow.
conventional explosives comparison? Apart from a few fur-trappers and hunters, the actual event wasn't witnessed directly, and no dash-cams back then. It wasn't until after WWI, the Revolution and nearly 20 years that the first qualified scientists arrived in the region to take measurements and record eye-witness accounts. Actually, the Imperial government may well have sent people East in the immediate aftermath of the event, but any records of such an expedition went West in the turbulent times between 1917 and 1922.
Lack of data hasn't held back speculation about the cause: meteorite, asteroid, annihilating anti-matter, black hole, 'natural' H-bomb, erupting natural gas cloud, the Storm-god Ogdy. Perhaps the most down to earth speculation makes the calculation that if the object had been 4hrs and 47mins later in arriving at the turning Earth, it would have exploded directly over St Petersburg and then we'd really have some data to analyse.