Ah, this brings back fond memories! This is a neat little video on vibroseis for natural gas exploration. We did it for earthquakes around the Toronto region, and all of it has been forgotten. You'll notice the vibrating plates directly on that crummy road? When we did one stretch of road, the road-bed settled under each plate, and left a distinct wobble when you drove over it. We had to resurface the road, and I suspect there will be some road damage here.