An instrument that detects vibrations passing through the earth's crust, used in conjunction with seismography. The geophone, also referred to as a seismometer, converts seismic oscillations of the ground into electrical signals. The most common type consists of a coil and magnet: one fixed rigidly with respect to the ground and the other suspended from a fixed support by a spring. Relative motion between the coil and magnet produces a current in the coil. Vertical and horizontal ground motion can be measured. Exploration geophones operate in the 5-200 Hz range. They can be used on the surface or in special downhole packages. Downhole geophones must be “locked” to the borehole wall when recording. Downhole geophones are used in velocity check surveys and vertical seismic profiling.
terms:geophone
terms/geophone.txt · Last modified: 2023/11/22 08:41 by 127.0.0.1