Discussion
Match the method with what it detects.
1. Seismic refraction 2. Electrical resistivity 3. Gravity survey
P. Density contrasts such as cavities Q. Depth to layers of differing velocity R. Saturation and clay content
Answer: D
Correct answer: 1-Q, 2-R, 3-P
Each method senses a different physical property. Seismic refraction times the arrival of waves refracted along an interface, so it gives depth to layers of contrasting velocity. Resistivity responds to pore water and clay, so it maps saturation and clay content. Gravity responds to mass, so it finds density contrasts such as cavities.
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