000007582 001__ 7582
000007582 005__ 20250417114134.0
000007582 0247_ $$2DOI$$a10.26443/seismica.v4i1.1408
000007582 037__ $$aSCART-2025-0132
000007582 100__ $$aDiaz, J.
000007582 245__ $$aMonitoring Time Variations in Seismic Noise Amplitude at Permanent Seismic Networks
000007582 260__ $$c2025
000007582 520__ $$aThe quality control process usually followed at broad-band seismic networks includes the calculation of the power spectral density and their probability density functions. These results do not make possible a quick estimation of temporal variations that can result from non-continuous sources of noise, meteorologic phenomena, etc. We propose the use of the SeismoRMS package, originally developed to analyze the seismic amplitude variations associated with the COVID19 lockdown, to monitor the time evolution of seismic noise sources in a permanent network, using as a case example the dataset collected during 2023 by the CA network in NE Iberia. Frequencies above 1 Hz show remarkable differences between the stations, despite sharing similar installation settings. Most of the sites show day/night and working day/weekend variations, suggesting a relevant contribution of anthropic sources, but the amplitude of such variations differs strongly among the sites. Our study allows us to identify specific sources of noise affecting some sites during short and regular time periods, an aspect that needs to be taken into account when evaluating the overall quality of each site. We conclude that a systematic analysis of the amplitude variations at different frequency bands can be a tool of interest for the management of a broad-band seismic network.
000007582 594__ $$aNO
000007582 6531_ $$aseismic noise
000007582 6531_ $$anetworks
000007582 6531_ $$aanthropogenic
000007582 700__ $$aJara, J.-A.
000007582 700__ $$aSánchez-Pastor, P.
000007582 700__ $$aFrontera, T.
000007582 700__ $$aSeivane, H.
000007582 700__ $$aJorde, S.
000007582 700__ $$aLecocq, T.
000007582 773__ $$pSeismica$$v4$$y2025
000007582 8560_ $$fthomas.lecocq@ksb-orb.be
000007582 8564_ $$s453644$$uhttps://publi2-as.oma.be/record/7582/files/Screenshot 2025-04-17 113943.png$$yGraphical representations of the time variations of the power of the seismic acceleration amplitude for the 1.0-10.0Hz frequency band at station CCAS. Power amplitudes are expressed in dB, relative to 1 m2/s4/Hz. (a) RMS of the poweramplitude calculated every 30 minutes (blue line), averaged daily (red line) and averaged weekly (orange line). (b) Power amplitude variation averaged for each day of the week and represented as a function of the hour of the day. (c) Power amplitude variation, represented using a color palette, as a function of the hour of the day. (d) Idem, but represented in a circular graph.
000007582 8564_ $$s12055$$uhttps://publi2-as.oma.be/record/7582/files/Screenshot 2025-04-17 113943.gif?subformat=icon$$xicon$$yGraphical representations of the time variations of the power of the seismic acceleration amplitude for the 1.0-10.0Hz frequency band at station CCAS. Power amplitudes are expressed in dB, relative to 1 m2/s4/Hz. (a) RMS of the poweramplitude calculated every 30 minutes (blue line), averaged daily (red line) and averaged weekly (orange line). (b) Power amplitude variation averaged for each day of the week and represented as a function of the hour of the day. (c) Power amplitude variation, represented using a color palette, as a function of the hour of the day. (d) Idem, but represented in a circular graph.
000007582 8564_ $$s9472$$uhttps://publi2-as.oma.be/record/7582/files/Screenshot 2025-04-17 113943.jpg?subformat=icon-180$$xicon-180$$yGraphical representations of the time variations of the power of the seismic acceleration amplitude for the 1.0-10.0Hz frequency band at station CCAS. Power amplitudes are expressed in dB, relative to 1 m2/s4/Hz. (a) RMS of the poweramplitude calculated every 30 minutes (blue line), averaged daily (red line) and averaged weekly (orange line). (b) Power amplitude variation averaged for each day of the week and represented as a function of the hour of the day. (c) Power amplitude variation, represented using a color palette, as a function of the hour of the day. (d) Idem, but represented in a circular graph.
000007582 905__ $$apublished in
000007582 980__ $$aREFERD