A sensitive electronic instrument that detects and records vibrations and seismic waves in the earth, used in geological and geophysical research.
From Greek 'geo-' (earth) and 'phone' (sound, vibration). This instrument name emerged in mid-20th century during the development of modern seismology and oil exploration technology.
Geophones are so sensitive they detect atomic bomb tests thousands of miles away—entire networks of them circle the globe as part of the Comprehensive Nuclear Test Ban Treaty, making them literal peacekeeping instruments.
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