As I read through Revelation, I’m struck by the amount of language that is full of echos from the OT (actually, it’s from the LXX, but that’s another post). One of these allusions is the idea of shaking the earth. You can also see this in the book of Hebrews. This is a reference back to Sinai and the giving of the Law to Moses in the midst of the Exodus. Just as the giving of the Law was a legal declaration of covenant with His people and judgment on all others, so too, the ministry of Christ is a declaration of covenant with His people and judgment on all others. It shakes the earth. One day Jesus will return and exact fully this judgment and fully implement His kingdom on the earth (which has already come & is continuing to come upon the earth). So, tell someone! Shake it up!