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A Helmholtz resonator buried in the ground as a source of seismic waves and low-frequency sound in the atmosphere

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Abstract

The procedure is given for calculating the total power of low-frequency sound and seismic waves produced by a Helmholtz resonator in the form of an air-filled spherical cavity buried in the ground and supplied with a hole through which it is connected with the atmosphere. The sound is generated by air oscillations in the resonator’s neck section that is open to the atmosphere, while the compression and shear elastic waves are generated in the bulk of the ground by cyclic pressure fluctuations that act on the spherical walls of the cavity. Calculations show that the coincidence of the resonance frequencies (within approximately ten to hundred hertz), at which both the sound radiation to the atmosphere and the elastic seismic radiation in the form of longitudinal and transverse bulk waves are maximum, can occur only when the resonator is placed in a loose ground characterized by reduced elastic characteristics. In these conditions, the power of transverse waves exceeds the sound power by a factor of two and the power of longitudinal waves is smaller than the sound power by a factor of several tens.

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Authors and Affiliations

  1. Institute of Applied Physics, Russian Academy of Sciences, ul. Ul’yanova 46, Nizhni Novgorod, 603950, Russia

    Yu. M. Zaslavskii

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  1. Yu. M. Zaslavskii
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__________

Translated from Akusticheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 49, No. 5, 2003, pp. 626–631.

Original Russian Text Copyright © 2003 by Zaslavski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\).

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Zaslavskii, Y.M. A Helmholtz resonator buried in the ground as a source of seismic waves and low-frequency sound in the atmosphere. Acoust. Phys. 49, 529–534 (2003). https://doi.org/10.1134/1.1608976

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  • DOI: https://doi.org/10.1134/1.1608976

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