"About 44 acres of coastline collapsed into the ocean this week..."
No big deal. When coastline collapses into the ocean, what are you left with? More coastline.
I dunno. How big is the island?
Not that I care (I didn't even care about the Tsunami) but it is actually reduced coastline. If you were to picture the island as a circle, a collapse of the coastline could only result in a circle with a smaller circumfernce. Unless somehow the collaps of the coastline left massive fjords like you see in Norway.
Actually, on an island, if enough coastline falls away, you are left with only ocean.