The Seismic Vibrator is one of dozens of tools I've come across in Expeditions, but unlike the others, it took me a while to learn how to use it properly. If you're still learning the ropes, here's how to use the Seismic Vibrator in Expeditions: A Mudrunner Game.
Expeditions A Mudrunner Game – A Little Shake – Use the Seismic Vibrator
The Seismic Vibrator serves no purpose outside of missions that task you with conducting seismic surveys in a designated area. There are five missions in total that require you to drive a truck equipped with a Seismic Vibrator. Each mission requires you to scour the map for the designated spot to activate the seismic vibration.
Related: Best Trucks in Expeditions A MudRunner Game
The only way to find the seismic vibration area is to follow the distance indicator in the upper right corner of the screen (see image). The number of meters will start to decrease as you move towards the area, which means you are playing a truck version of the popular hot and cold game.