Doing more research, I found the answer to my earlier question of, "What happens with / to the floating pumice?".
Pumice is light weight, often with pockets of gases trapped inside; "gas inclusions". It could float around a looong time.
The photos in the links that you provided show the result in island bays, and on the beaches.
This is still so amazing!
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More Possible Photo Titles:
From the President of the UN: “Now, who is testing bombs in the South Pacific?" Whom ever it was blew a hole in the floor!
From one sailing mate to another: "Honey, are you SURE you remembered to unplug the toaster?