According to the thread it's by Japanese artist Hiroshi Nagai, probably used without permission.
Impender Beach by Hiroshi Nagai... His works appear digitally duplicated everywhere, based on my DDG search results.
I offically surrender my fantasy of a secret Antifa agent within DHS. I also note abashedly that, with this new context, the picture doesn't portray a tsunami, but only a nice set of gnarly pipelines. Cowabunga!