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Smets, P.S.M. (author), Weemstra, C. (author), Evers, L.G. (author)We report on the extraction of deep ocean travel time variations from time-lapse cross-correlations between a hydrophone station and a three-component broadband seismometer. The signals we cross-correlate in this study result from repeated activity by the Monowai seamount, one of the most active submarine volcanoes of the Tonga-Kermadec ridge...journal article 2022
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den Ouden, O.F.C. (author), Assink, Jelle D. (author), Smets, P.S.M. (author), Evers, L.G. (author)The ambient infrasonic noise field is complex due to the interference of spatially distributed infrasound sources. Microbaroms are one of the most dominant omnipresent infrasonic sources within this wavefield. These microbaroms are generated by nonlinear ocean surface wave interactions, and have a characteristic and continuous signature...journal article 2022
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Evers, L.G. (author), Smets, P.S.M. (author), Assink, J. D. (author), Shani-Kadmiel, Shahar (author), Kondo, K. (author), Sugiyama, S. (author)A period of 18 years of infrasonic recordings was analyzed from a microbarometer array (I18DK) in northwestern Greenland, near Qaanaaq. A huge number of infrasonic detections, over 700,000, have been made in I18DKs soundscape during the Arctic summers. Simultaneously identified were both calving events from marine-terminating glaciers and...journal article 2022
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Patrick, Samantha C. (author), Assink, Jelle D. (author), Basille, Mathieu (author), Clusella-Trullas, Susana (author), Clay, Thomas A. (author), den Ouden, O.F.C. (author), Joo, Rocío (author), Evers, L.G. (author), Smets, P.S.M. (author)Seabirds are amongst the most mobile of all animal species and spend large amounts of their lives at sea. They cross vast areas of ocean that appear superficially featureless, and our understanding of the mechanisms that they use for navigation remains incomplete, especially in terms of available cues. In particular, several large-scale...journal article 2021
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den Ouden, O.F.C. (author), Smets, P.S.M. (author), Assink, Jelle D. (author), Evers, L.G. (author)A method is introduced to reconstruct microbarom soundscapes in absolute values. The soundscapes are compared to remote infrasound recordings from infrasound array I23FR (Kerguelen Island) and in situ recordings by the INFRA-EAR, a biologger deployed near the Crozet Islands. The reconstruction method accounts for all-acoustic contributions,...journal article 2021
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Shani-Kadmiel, Shahar (author), Averbuch, G. (author), Smets, P.S.M. (author), Assink, Jelle (author), Evers, L.G. (author)In the days following the January 12, 2010 M<sub>w</sub> 7 Haiti earthquake the shaking intensity near the epicenter was overestimated and the spatial extent of the potentially damaging shaking was underestimated. This was due to the lack of seismometers in the near-source region at the time of the earthquake. Besides seismic waves,...journal article 2021
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Weemstra, C. (author), De Laat, Janneke I. (author), Verdel, Arie (author), Smets, P.S.M. (author)Instrumental timing and phase errors are a notorious problem in seismic data acquisition and processing. These can be frequency independent, for example due to clock drift, but may also be frequency dependent, for example due to imperfectly known instrument responses. A technique is presented that allows both types of errors to be recovered...journal article 2020
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Averbuch, G. (author), Waxler, Roger M. (author), Smets, P.S.M. (author), Evers, L.G. (author)In seismology, the depth of a near-surface source is hard to estimate in the absence of local stations. The depth-yield trade-off leads to significant uncertainties in the source's depth and strength estimations. Long-range infrasound propagation from an underwater or underground source is very sensitive to variations in the source's depth and...journal article 2020
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den Ouden, O.F.C. (author), Assink, Jelle D. (author), Smets, P.S.M. (author), Shani-Kadmiel, Shahar (author), Averbuch, G. (author), Evers, L.G. (author)The detection and characterization of signals of interest in the presence of (in)coherent ambient noise is central to the analysis of infrasound array data. Microbaroms have an extended source region and a dynamical character. From the perspective of an infrasound array, these coherent noise sources appear as interfering signals which...journal article 2020
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Averbuch, G. (author), Ben-Horin, Yochai (author), Smets, P.S.M. (author), Evers, L.G. (author)Measurements of seismo-acoustic events by collocated seismic and infrasound arrays allow for studying the two wavefields that were produced by the same event. However, some of the scientific and technical constraints on the building of the two technologies are different and may be contradicting. For the case of a new station, an optimal design...journal article 2019
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Sambell, K.A.M. (author), Smets, P.S.M. (author), Simons, D.G. (author), Snellen, M. (author), Evers, L.G. (author)Continuous long-term sound sources are recorded at hydroacoustic station H03S, a threeelement hydrophone array south of Robinson Crusoe Island between 2014 April 23 and 2017 August 20. The origin of the signal between 3 and 20 Hz is investigated by using cross-correlation, array processing using plane wave beamforming and spectral analysis....journal article 2019
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Smink, M.M.E. (author), Assink, Jelle D. (author), Bosveld, Fred C. (author), Smets, P.S.M. (author), Evers, L.G. (author)The Royal Netherlands Meteorological Institute (KNMI) operates a three-dimensional microbarometer array at the Cabauw Experimental Site for Atmospheric Research observatory. The array consists of five microbarometers on a meteorological tower up to an altitude of 200 m. Ten ground-based microbarometers surround the tower with an array aperture...journal article 2019
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Evers, L.G. (author), Assink, J. D. (author), Smets, P.S.M. (author)Supersonic rockets generate low-frequency acoustic waves, that is, infrasound, during the launch and re-entry. Infrasound is routinely observed at infrasound arrays from the International Monitoring System, in place for the verification of the Comprehensive Nuclear-Test-Ban Treaty. Association and source identification are key elements of the...journal article 2018
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Averbuch, G. (author), Assink, Jelle D. (author), Smets, P.S.M. (author), Evers, L.G. (author)Low-frequency acoustic, i.e., infrasound, waves are measured by sparse arrays of microbarometers. Recorded data are processed by automatic detection algorithms based on array-processing techniques such as time-domain beam forming and f-k analysis. These algorithms use a signal-to-noise ratio (S/N) value as a detection criterion. In the case...journal article 2018
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Smets, P.S.M. (author)Infrasound is low-frequency inaudible sound (< 20Hz), used as a waveform verification technique for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). In this thesis, it is shown that infrasound can provide useful additional upper atmospheric observations in a region where data coverage is sparse; beyond the middle stratosphere direct...doctoral thesis 2018
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Shani-Kadmiel, Shahar (author), Assink, Jelle D. (author), Smets, P.S.M. (author), Evers, L.G. (author)In this study we analyze infrasound signals from three earthquakes in central Italy. The M<sub>w</sub> 6.0 Amatrice, M<sub>w</sub> 5.9 Visso, and M<sub>w</sub> 6.5 Norcia earthquakes generated significant epicentral ground motions that couple to the atmosphere and produce infrasonic waves. Epicentral seismic and infrasonic signals are...journal article 2018
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Blanc, E (author), Ceranna, L. (author), Hauchecorne, A (author), Charlton-Perez, A (author), Marchetti, E. (author), Evers, L.G. (author), Kvaerna, T (author), Lastovicka, J. (author), Eliasson, L. (author), Crosby, N. B. (author), Blanc-Benon, P. (author), le Pichon, A (author), Brachet, N (author), Pilger, C (author), Keckhut, P (author), Assink, J. D. (author), Smets, P.S.M. (author), Lee, C. F. (author), Kero, J. (author), Sindelarova, T. (author), Kämpfer, N. (author), Rüfenacht, R. (author), Farges, T. (author), Millet, C. (author), Näsholm, S. P. (author), Gibbons, S. J. (author), Espy, P. J. (author), Hibbins, R. E. (author), Heinrich, P (author), Ripepe, M (author), Khaykin, S. (author), Mze, N. (author), Chum, J. (author)This paper reviews recent progress toward understanding the dynamics of the middle atmosphere in the framework of the Atmospheric Dynamics Research InfraStructure in Europe (ARISE) initiative. The middle atmosphere, integrating the stratosphere and mesosphere, is a crucial region which influences tropospheric weather and climate. Enhancing...journal article 2018
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Smets, P.S.M. (author), Assink, J. D. (author), Le Pichon, A. (author), Evers, L.G. (author)Accurate prediction of Sudden Stratospheric Warming (SSW) events is important for the performance of numerical weather prediction due to significant stratosphere-Troposphere coupling. In this study, for the first time middle atmospheric numerical weather forecasts are evaluated using infrasound. A year of near-continuous infrasound from the...journal article 2016
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Assink, J. D. (author), Averbuch, G. (author), Smets, P.S.M. (author), Evers, L.G. (author)The underground nuclear tests by the Democratic People's Republic of Korea (DPRK) generated atmospheric infrasound both in 2013 and 2016. Clear detections were made in the Russian Federation (I45RU) and Japan (I30JP) in 2013 at stations from the International Monitoring System. Both tropospheric and stratospheric refractions arrived at the...journal article 2016
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Smets, P.S.M. (author), Evers, L.G. (author), Näsholm, S.P. (author), Gibbons, S.J. (author)This study demonstrates probabilistic infrasound propagation modeling using realistic perturbations. The ensembles of perturbed analyses, provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), include error variances of both model and assimilated observations. Ensemble spread profiles indicate a yearly mean effective sound...journal article 2015
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