Title text:
Some lava around the piercing site is normal, but keep an eye out for spreading earthquakes and eruptive activity that might indicate rifting.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3145/
Why not?
It's mostly a big desert so no land of great value is lost. And it has to be on land, doing this in the ocean would be impractical and crazy!