Now the aliens can go back to making the ground move.
Nothing's been booming or shaking in Clintonville for a few weeks, so seismometers and sound sensors were being pulled out of the ground and packed up Monday.
A swarm of minor earthquakes that besieged the city in late March, rattling windows and disrupting sleep, grabbed international headlines and spawned rumors about what could be causing the unusual vibrations and accompanying loud noises. But no aliens, underground mines or secret tunnels were found.
Several residents at public meetings blamed pranksters blowing up fireworks in city sewers while others questioned if unusually warm weather was to blame.
"We're confident they were earthquakes," City Administrator Lisa Kuss said Monday.