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<p>The ISCO infrasound array has been installed at the Conrad Observatory (Austria, ~ 50 km SSW Vienna) since January 2021. Among the signals detected (average peak-peak amplitude 0.01&#xa0;Pa), regularly recurring signals can be attributed to blasting in a limestone quarry located ~ 16 km away. The characteristic signal shape (max. spectral amplitudes 0.5–1.2&#xa0;Hz) and the availability of blasting data provided a basis for an in-depth analysis of these signals. The response of the atmosphere to the rock mass set in motion by blasting is considered to be the source of the signals. The kinematics of the blasted rock masses, in particular the change in volume during the ejection process, was derived from photogrammetric documentation of the deposits and numerical modeling of the ejection process for six blasts. Among four candidate monopole source functions the pulsating sphere source function in combination with a transfer function consistent with reverberation of long-wavelength sound allows excellent modeling of the signal shape. An analogy between the shape and acoustics of classical amphitheaters and the shape of the open-cast mine and its possible acoustic effectiveness is considered hypothetically to explain the generation of the reverberations. Peak-to-peak model amplitudes correlate well with total explosive charge (R<sup>2</sup> = 0.87), while observed infrasound amplitudes shows larger scatter versus total explosive charge (max. ~ 3000&#xa0;kg) over 50 blasts (R<sup>2</sup> = 0.37), reflecting source-strength variability and unmodeled atmospheric propagation. In order to support the separation of these two components the installation of an infrasound sensor within the quarry area is planned.</p>

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Analysis of Infrasound Signals Generated by Quarry Blasts

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月16日

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  • Ulrike Mitterbauer,
  • Ewald Brückl,
  • Peter Carniel,
  • Stefan Mertl

摘要

The ISCO infrasound array has been installed at the Conrad Observatory (Austria, ~ 50 km SSW Vienna) since January 2021. Among the signals detected (average peak-peak amplitude 0.01 Pa), regularly recurring signals can be attributed to blasting in a limestone quarry located ~ 16 km away. The characteristic signal shape (max. spectral amplitudes 0.5–1.2 Hz) and the availability of blasting data provided a basis for an in-depth analysis of these signals. The response of the atmosphere to the rock mass set in motion by blasting is considered to be the source of the signals. The kinematics of the blasted rock masses, in particular the change in volume during the ejection process, was derived from photogrammetric documentation of the deposits and numerical modeling of the ejection process for six blasts. Among four candidate monopole source functions the pulsating sphere source function in combination with a transfer function consistent with reverberation of long-wavelength sound allows excellent modeling of the signal shape. An analogy between the shape and acoustics of classical amphitheaters and the shape of the open-cast mine and its possible acoustic effectiveness is considered hypothetically to explain the generation of the reverberations. Peak-to-peak model amplitudes correlate well with total explosive charge (R2 = 0.87), while observed infrasound amplitudes shows larger scatter versus total explosive charge (max. ~ 3000 kg) over 50 blasts (R2 = 0.37), reflecting source-strength variability and unmodeled atmospheric propagation. In order to support the separation of these two components the installation of an infrasound sensor within the quarry area is planned.