Synonyms
Feedback system; Inverse filtering; Negative impedance converter
Introduction
Until the advent of the broadband seismometer (Wielandt and Streckeisen 1982), electrodynamic geophones were used for picking up short-period (1 s and less) earth movement, and LP (long period) seismometers were used for anything with lower frequency than one second. Owing to their bulk and weight, LP seismometers are not practical for use in the field; they typically require a controlled observatory-type environment. Most types of geophones, on the other hand, are by their very nature field worthy, compact, and cheap. This is because they are mass-produced for use in seismic exploration where they are typically deployed in large numbers (hundreds or thousands). The downside is that their natural frequency is usually 4.5 Hz or more. Some geophones designed for scientific use have a natural frequency of 1 Hz, but this low-frequency limit comes at the expense of significant bulk and weight and an...
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References
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Stoll, D. (2015). Seismometer, Extended Response. In: Beer, M., Kougioumtzoglou, I.A., Patelli, E., Au, SK. (eds) Encyclopedia of Earthquake Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35344-4_174
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DOI: https://doi.org/10.1007/978-3-642-35344-4_174
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