Re: [meteorite-list] Fireball questions

[GeoZay]

>> If  a fireball explode and create a sonic(shock) wave observed in seismic stations;  if the same fireball create thump rumble or thump deflagrations; can we suppose find a meteorite on the ground?<< I once pursued in California a very loud sonic producing fireball with Caltech who monitored the various seismic stations. I was told that these kind of sounds were somehow filtered out so they wouldn't show up on the seismigraphs.   >>At wich altitude a normal bolide can explode, or produce a  audible sonic boom?<< To produce a sonic boom, the meteoroid would have to be at least 30 miles above the earth. George Zay

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