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PS Suspension Logging Test (Shear Wave Velocity) |
PS Suspension Logging is a recently developed method for measurement of shear wave velocities, shear modulus, Poissons Ratio and Youngs Modulus in boreholes as it has become an imperative requirement to grasp precise knowledge of the underground, especially, the vibration characteristics of the ground as they are an important fundamental data for designing earthquake-proof structures.
In this method, the probe in which the seismic source and the geophone are incorporated in a series serves to exert pressure on the borehole wall via the borehole water; furthermore this innovative system functions to measure the propagation velocities of P wave and S wave by detecting the behavior of the borehole water through the geophone of floating type.
AHAM uses the OYO P-S Suspension Logger. The advantage of the PS Suspension logging as compared to the Up-hole and Down-hole systems is that, since both the source and the receiver are within the borehole itself, hence making this system least sensitive as possible to traffic vibration and other noise sources.
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