Crosshole Shear Wave Hammer

The crossshole shearwave hammer system is a seismic source used to generate vertically polarized shear waves inside a borehole. Shear wave velocities are used to determine dynamic elastic moduli of undisturbed rock strata and soils, and are used for a range of civil engineering applications.
A hydraulic hand pump on the surface allows locking plates to be extended, clamping the hammer system to the borehole walls. This locks the source body in situ allowing the hammer to strike the fixed anvil, and thus generate shear waves. A trigger switch positioned on the hammer is used for triggering the seismograph.

Crosshole Hammer WD7501 Spec.

Diameter:  
Diameter with packer: 
Diameter with locking plate
fully extended: 
Diameter with packer and
Locking plate fully extended
Striker length: 
Stationary body length
between impact points:                    
Striker travel distance:                   
Active weight (striker):                     
Total hammer weight:                      
Maximum Hydraulic pressure:  
Locking plate surface area:
Hydraulic hose length: 
Wire rope length:  
Wire breaking strain:
Trigger cable length: 

75mm
87.5mm
102mm

114.5mm
1300mm

315mm
385mm
5.1Kg
15.3Kg
1000psi (70 bar)
11200 mm²
50m (extendable)
100m
580Kgf
100m