Abstract
The ability of the International Monitoring System (IMS) global infrasound network to detect atmospheric explosions and other events of interest depends strongly on station-specific ambient incoherent noise and clutter (real but unwanted infrasound waves, coherent on an infrasound array). Characterization of coherent infrasound is important for quantifying the recording environment at each station and for assessing the detection probability of specific signals of interest. We systematically characterize coherent infrasound recorded by the IMS network over 10 years on 41 stations over a broad frequency range (0.01–5 Hz). This multiyear processing emphasizes continuous signals such as mountain associated waves and microbaroms, as well as persistent transient signals such as repetitive volcanic, surf, thunder, or anthropogenic activity. We estimate the primary source regions of continuous coherent infrasound using a global cross-bearings approach. For most IMS arrays, the detection of persistent sources is controlled by the dynamics of the stratospheric wind circulation from daily to seasonal scales. Systematic and continuous characterization of multiyear array detections helps to refine knowledge of the source of ambient ocean noise and provides additional constraints on the dynamics of the middle atmosphere where data coverage is sparse.
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Acknowledgements
We thank the CTBTO and station operators for guaranteeing the high quality of the infrasound data. This work was performed during the course of the ARISE design study (http://arise-project.eu), funded under the H2020 Framework Programme of the European Union (grant 653980).
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Ceranna, L., Matoza, R., Hupe, P., Le Pichon, A., Landès, M. (2019). Systematic Array Processing of a Decade of Global IMS Infrasound Data. In: Le Pichon, A., Blanc, E., Hauchecorne, A. (eds) Infrasound Monitoring for Atmospheric Studies. Springer, Cham. https://doi.org/10.1007/978-3-319-75140-5_13
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