Seismic Beacon-A New Instrument for Detection of Changes in Rock Massif

0584937 - ÚSMH 2025 RIV CH eng J - Journal Article
Lukešová, Renata - Málek, Jiří
Seismic Beacon-A New Instrument for Detection of Changes in Rock Massif.
Sensors. Roč. 24, č. 1 (2024), č. článku 234. E-ISSN 1424-8220
R&D Projects: GA TA ČR(CZ) TP01010055
Institutional support: RVO:67985891
Keywords : seismic beacon * nonlinear phenomena * harmonic seismic wave
OECD category: Geology
Impact factor: 3.9, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/s24010234

The seismic beacon is a new instrument that allows for the measurement of changes in a rock massif with high sensitivity. It is based on effects, which affect the propagation of harmonic seismic waves generated continuously with stable and precise frequency and amplitude. These seismic waves are registered by a system of seismic stations. The amplitude of the seismic signal is very small, and it is normally hidden in a seismic noise. Special techniques are applied to increase the signal-to-noise ratio. In 2020, the first prototype of the seismic beacon was constructed in a laboratory, and field tests were performed in 2022 and 2023. During the tests, the changes in spectral amplitude and phase of seismic waves were detected, which is interpreted as the changes in material properties. These measurements testified the basic functionality of the device. The seismic beacon has been developed primarily for the detection of critical stress before an earthquake, which is manifested by non-linear effects such as higher harmonics generation. In addition, it could be used, for example, in the detection of magma movements, groundwater level changes, changes in hydrocarbon saturation in rocks during the extraction of oil and natural gas, or the penetration of gases and liquids into the earth's crust.
Permanent Link: https://hdl.handle.net/11104/0352766