S i n k h o l e D e t e c t i o n
Here are some methods that professionals use to detect sinkholes:
- Thermal- Probes are driven into the soil and they measure with thermal infrared waves. A place where a sinkhole may form has a different temperature than the rest of the ground.
- Electromagnetic- They send waves of electricity through the ground using DC currents and the resistance determines if the ground has the potential for a sinkhole to form.
- Resistivity- People inject a DC current through the ground by two electrodes and measure resulting voltage with two other electrodes.
- Seismic Refraction- Geophones are placed on the surface of the ground and seismic waves are produced and sent into the ground and it is reflected back to the geophones by hitting rock formations. This method measures the time it takes to bounce back up to the geophones. The time it takes to bounce back up is determined by the soil and rocks.