Hi Selene.
The wave thing has been discussed on various threads.
I'll look around and see what I come up with.
I didn't see any specific FR threads in my search; however
there is enough info presented here for your perusal.
GOOGLE Search Term: "Collapsing Volcano"
http://www.google.com/search?q=%22Collapsing+Volcano%22&hl=en&lr=&ie=UTF-8&filter=0
GOOGLE Search Term: "Benfield Greig Hazard Research Centre"
http://www.google.com/search?q=Benfield+Greig+Hazard+Research+Centre%22+%0D%0A&hl=en&lr=&ie=UTF-8&filter=0
GOOGLE Search Term: "Dr. Simon Day"
http://www.google.com/search?q=%22Dr.+Simon+Day%22&hl=en&lr=&ie=UTF-8&filter=0