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COUPLAGE SOL‐GEOPHONE*
- Source: Geophysical Prospecting, Volume 18, Issue 2, Apr 1970, p. 300 - 319
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- 27 Apr 2006
Abstract
The seismometer‐ground system is represented by a damped oscillatory system. Relatively simple approximation formulas are derived to express the coupling between ground and seismometer. These expressions are applicable in seismic exploration. The coupling is that of a mass, suspended by a spring, to the surface that the ground would have in absence of the seismometer. It results in a low‐pass filtering of the ground motion, which is due to the presence of the seismometer. This effect is expressed in a unit‐impulse response. It appears that, over a sufficiently homogeneous ground and for low frequencies, one has a true coupling between ground and seismometer. To obtain a sufficiently large pass‐band, a low seismometer housing‐mass together with a not too small housing radius are necessary.