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[ettore]

Grizzled,
I learned some years ago of a case involving a pretty large freighter at sea, which litteraly exploded at the surface of a smaller pond than the Altlantic, the Mediterranean sea, where such event should be clearer, once registered by sismographers. All sismic datas around the date and location of the explosion were carefully screened. But nothing would tell any difference betwenn that explosion - or impact, in case of an a/c crash - and usual sismic activity. It got lost in the "background noise", so to say.