Ten teams have been named semifinalists in the American-Made Geothermal Geophone Prize, each earning $75,000 in cash prizes and $75,000 in vouchers for technical assistance to advance technologies that will help deploy the renewable energy supplied by the heat of the Earth.
Geophones are tools that scientists use to detect underground acoustic vibrations or listen for seismic noise, which is useful in a variety of applications and increasingly in geothermal reservoir monitoring. However, traditional seismic monitoring tools cannot easily withstand the high temperatures, high rock strengths, and corrosive working fluids in many of our hottest geothermal wells.
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https://www.nrel.gov/news/program/2023/bring-on-the-seismic-noise.html