Geophysics is a tool that is most often used to uncover Earth’s history. On a large scale geophysics tells us about the structure of the earth with its core, mantle, and crust or how tectonic plates move apart and come together. On a smaller scale, it can tell us about where ancient rivers used to flow, where the ground has cracked under stress, or where we can find energy and materials.
Geophysics is also a tool to uncover our recent human history. A profoundly sad truth has been emerging as ground penetrating radar (GPR), a geophysical tool, is being used to identify the unmarked graves of children who died in Canadian residential schools.
What is GPR?
GPR is a tool to locate shallow buried objects like wires and pipes or to find voids like graves or tunnels and trenches from WW1.
“The device includes a radar-transmitting antenna that sends the high-frequency waves into the ground that will bounce back to the receiver if they hit anything that is different from the medium of the soil.” – CBC
For more on GPR and its role in uncovering Canadian history, please visit the link below.
https://www.cbc.ca/news/canada/ground-radar-technology-residential-school-remains-1.6049776
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