This is just a taste of what will be at the Second Trumpet. Note all coastal cities will be wiped out by the meteor induced tsunami (Rev. 8:8). This event will take place before the Mark of the Beast is instituted (Rev. 13).
Note that the Seal and Trumpet Judgments (Rev. 6-9) take place before the reign of the Anti-Christ at the last 42 months of the 7 year tribulation period (Rev. 13).
The Kingdom of Heaven is at hand!