Alright, let's see what we've got here…
Ok, so I'm not going to do a line-by-line, mostly because I couldn't really find anything. I suggest going through this again with a comb on your own to make sure that you're fine, but all the writing and tone seemed to be in order.
Moving on to execution/concept, I like the base idea. However your execution suffers mostly from the fact that your incident log feels mostly like a rehash of the description, but in action. There are a few nice bits, but the majority of it does not feel like its anything new.
So I suggest you either revamp your incident log to add a new perspective to the anomaly (something that acts as a twist so this doesn't feel like its played so straight), or you remove details from your description and add then imply them with your incident log. Since I don't exactly have ideas for how to do the former, I'll give suggestions on how the execute the latter.
For example, you could leave it ambiguous exactly what the people on the island see once they get there. Just say that "All vehicles take on the appearance of some form of sea life" and then in the incident log you can imply the fact that they are all afraid of sharks in the water, as well as the mutilated nature of the medical personnel. So that way the reader is left with some mystery about the anomaly, and it amps up the WTFness of the article.
Hopefully that helps. Good luck!
