T-Rex is a tri-axial hydraulic mobile shaker. It can generate large dynamic forces in any of three directions (vertical, horizontal in-line, and horizontal cross-line), where the shaking direction can be changed with a simple push of a button by the operator. The shaking system, mounted on an off-road, all-wheel-drive vehicle, can produce a maximum force output of around 267 kN in the vertical direction, and around 134 kN in each horizontal direction, respectively.
Liquidator is a unique, custom-built shaker designed specifically for low-frequency operation. The shaker can generate a maximum force output of approximately 89 kN down to a frequency of 1.3 Hz. In a new modified configuration where the entire off-road mobile platform is lifted off the ground and oscillates in the vertical mode, Liquidator can generate maximum forces of 89 kN down to a frequency of 0.7 Hz. This modification provides unique capabilities that can facilitate deeper (1 km or more) active-source subsurface imaging.
Thumper is built on a street-legal truck and has a moderate force output, making it ideal for testing in urban areas. The maximum force output of Thumper in the vertical or horizontal directions is about 27 kN. With around two hours of work in the field, Thumper’s shaking direction can be changed at the test site.