This case study illustrates how electrical resistivity profiling was used to map a subsurface gravel deposit and impermeable clay layer. The geophysical data gave the geologists the information needed to successfully plan new exploratory and extraction wells and aided in designing a cut-off wall.
Often young deep alluvium prevents trenches from reaching ruptured soils making determining a fault's location and activity difficult. Here we illustrate how high resolution seismic refraction was used to find a fault.
Finding a buried fault was critical to drilling a water well. Drilling on one side of the fault would create a useful well while drilling on the other would result in a dry hole. This case study illustrates how seismic refraction was used to locate the fault.
A small water district wanted to drill a new well in a river bank of a coastal stream. Prior to drilling, the district needed to determine if saltwater had intruded the river bank. This case study illustrates how a combination of resistivity and seismic techniques were used to map the extent of saltwater intrusion along the stream.
Prior to purchasing a small shopping mall, a land developer wanted to determine if the tanks of a former service station had been removed. This case study shows how magnetics and radar were used to locate six buried fuel storage tanks.
As part of a geophysical study of a groundwater basin for a proposed power plant in the California desert, downhole seismic data and multichannel analysis of surface waves (MASW) data were collected to help determine liquefaction potential. This example shows a comparison of the results from the two techniques.
At J R Associates we stand ready to apply our geophysical expertise to your particular requirements. Please contact us to discuss how our combination of techniques, knowledge and experience can provide you with a window on what's underground.