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Abstract

The feasibility of directly detecting near-surfaces cavities is challenging due to the complexity of nearsurface<br>materials and the limited resolution of seismic techniques.<br>Therefore, Shallow seismic survey has been applied for an area of limestone rocks includes subsurface<br>cavity at depth about 3 meters under the ground surface. seismic waves have been generated and<br>acquired with high resolution and good quality characteristics along profiles passing through the cavity<br>with 1 meter geophone spacing and multi-channels seismograph. During a comprehensive sequence of<br>data processing and using more sophisticated software for refraction tomography and multi-channel<br>analysis of surface waves (MASW ) , the cavity has detected at about 3 meters depth and about 30<br>meters of lateral extension has been clearly identified. Furthermore, the location of the cavity has been<br>confirmed successfully through the application of GPR surveying profiles along the inspected cave<br>position. The acquired GPR profiles are processed and filtered to minimize the noise effects. High<br>amplitude reflections are observed within the profile. These high amplitude reflections are good<br>indicator to the presence of cavity at a depth of 3 meters from the earth's surface with thickness of<br>about 8 meters and extend laterally for about 30 meters in the profile direction. It noticed that both of<br>lateral extension and depth to the top of the cavity have been identified through seismic and GPR data<br>interpretation. It is concluded that, the integration between two different near surface geophysical<br>techniques is powerful and helpful way in detecting not only the depth for the subsurface features but<br>also in determining their lateral dimensions.

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/content/papers/10.3997/2214-4609-pdb.248.001
2010-03-07
2024-03-29
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