Look at this terrifying landslide tsunami video!
The speed and violence of this landslide tsunami is stunning!

I have absolutely no idea as to the setting or reason for this quite amazing landslide tsunami! But it is just mind-blowing!
Could it be a control blast that has deliberately destabilised a very large section of slope behind? Or just the terrifying force of nature swallowing a portion of the ground?
In any cases, the slope slide is generating the tsunami and the complex water movement thereafter. Destructive but awesome!