Ive been looking under the oceans surrounding the islands. There seems to be evidence of past break-offs where the chunks of island are still sitting at the bottom. If you study it long enough, you will start to begin to notice what look like break-offs and what look like lava rivers. The lava rivers must have formed before the oceans rose because lava doesn't make rivers underwater.

Then check out the link below, click the star then zoom into the island. Look underwater on the southern tip that has the crack. Looks like a piece of the tip that already broke off in the past just sitting there on the ocean floor! Then look on the west side underwater. Again more bits and pieces down at the bottom there too. Also evidence of what looks like landslides gouging ruts into the side of the volcano as lava peninsulas probably broke off / slid down.

[link to www.ign.es]

Also look at the island below La Palma, Fontera? Looks like an entire shelf broke off, and sits at the bottom.

For folks to make decisions, all they need to do is to look underwater. What can we expect? We need to watch the EQs and pray.