The European Arctic: A Laboratory for Seismoacoustic Studies

Gibbons, Steven J.; Асминг, В. Э.; Eliasson, L.; Fedorov, Andrei G.; Fyen, Jan; Kero, Johan; Kozlovskaya, Elena; Kværna, Tormod; Liszka, Ludwik; Näsholm, Sven Peter

doi:10.31223/osf.io/ypzv3

Cited by 4 publications

(5 citation statements)

References 33 publications

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“…Acoustic signals from the event were observed at two infrasound array stations in the region: at the 10-element microbarometer array IS37 at latitude 69.0741°, longitude 18.6076°close to Bardufoss, Norway, and at the SDK 3element microphone array at latitude 67.4206°, longitude 26.3902°, close to Sodankylä, Finland (for array geometries and further information on the infrasound station networks, see Gibbons et al (2015)). Filtered signal recordings and array signal processing output are displayed in Figure 15 for the IS37 station and in Figure 16 for the SDK station.…”

Section: Infrasound Observationsmentioning

confidence: 99%

Multi-instrument observations of the Pajala fireball: Origin, characteristics, and atmospheric implications

Vierinen

Aslaksen

Chau

et al. 2022

Front. Astron. Space Sci.

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Meteor observations provide information about Solar System constituents and their influx onto Earth, their interaction processes in the atmosphere, as well as the neutral dynamics of the upper atmosphere. This study presents optical, radar, and infrasound measurements of a daytime fireball that occurred on 4 December 2020 at 13:30 UTC over Northeast Sweden. The fireball was recorded with two video cameras, allowing a trajectory determination to be made. The orbital parameters are compatible with the Northern Taurid meteor shower. The dynamic mass estimate based on the optical trajectory was found to be 0.6–1.7 kg, but this estimate can greatly vary from the true entry mass significantly due to the assumptions made. The meteor trail plasma was observed with an ionosonde as a sporadic E-like ionogram trace that lasted for 30 min. Infrasound emissions were detected at two sites, having propagation times consistent with a source location at an altitude of 80–90 km. Two VHF specular meteor radars observed a 6 minute long non-specular range spread trail echo as well as a faint head echo. Combined interferometric range-Doppler analysis of the meteor trail echoes at the two radars, allowed estimation of the mesospheric horizontal wind altitude profile, as well as tracking of the gradual deformation of the trail over time due to a prevailing neutral wind shear. This combined analysis indicates that the radar measurements of long-lived non-specular range-spread meteor trails produced by larger meteoroids can be used to measure the meteor radiant by observing the line traveled by the meteor. Furthermore, a multistatic meteor radar observation of these types of events can be used to estimate mesospheric neutral wind altitude profiles.

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Section: Infrasound Observationsmentioning

confidence: 99%

Multi-instrument observations of the Pajala fireball: Origin, characteristics, and atmospheric implications

Vierinen

Aslaksen

Chau

et al. 2022

Front. Astron. Space Sci.

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“…Operating for several decades, this network has recorded signatures from a large number of explosions resulting from mining activity and controlled explosions of obsolete military equipment (Gibbons and Ringdal, 2010). Gibbons et al (2015) provides a thorough description of the array station network and describes event detection and characterization of seismo-acoustic events. Repetitive ground truth explosive events of anthropogenic origin have been registered in a database covering nearly 16000 explosions from 1987 up to present.…”

Section: A Ground Truth Eventsmentioning

confidence: 99%

“…An f -k analysis is performed on cross-correlations traces formed between all sensor trace pairs (Brown et al, 2002;Gibbons et al, 2015). The wavefront parameters (backazimuth and trace velocity) are determined from the slowness space coordinate where the average crosscorrelation value between all sensor traces has its maximum.…”

Section: Infrasound Data Processingmentioning

confidence: 99%

Estimating tropospheric and stratospheric winds using infrasound from explosions

Blixt

Näsholm

Gibbons

et al. 2019

The Journal of the Acoustical Society of America

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The receiver-to-source backazimuth of atmospheric infrasound signals is biased when cross-winds are present along the propagation path. Infrasound from 598 surface explosions from over 30 years in northern Finland is measured with high spatial resolution on an array 178 km almost due North. The array is situated in the classical shadow-zone distance from the explosions. However, strong infrasound is almost always observed, which is most plausibly due to partial reflections from stratospheric altitudes. The most probable propagation paths are subject to both tropospheric and stratospheric cross-winds, and our wave-propagation modelling yields good correspondence between the observed backazimuth deviation and cross-winds from the ERA-Interim reanalysis product.We demonstrate that atmospheric cross-winds can be estimated directly from infrasound data using propagation time and backazimuth deviation observations. We find these cross-wind estimates to be in good agreement with the ERA-Interim reanalysis.

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“…In addition, national seismoacoustic monitoring systems have been developed in central Europe over several decades to fill a gap in the global IMS network 38 . Nowadays, the detection and location capabilities of combined networks offer a unique opportunity to investigate methods for discriminating between natural and artificial acoustic sources, as well as to better understand seismoacoustic coupling mechanisms at the Earth’s interface 39 , 40 .…”

Section: Resultsmentioning

confidence: 99%

Using dense seismo-acoustic network to provide timely warning of the 2019 paroxysmal Stromboli eruptions

Pichon

Pilger

Ceranna

et al. 2021

Sci Rep

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Stromboli Volcano is well known for its persistent explosive activity. On July 3rd and August 28th 2019, two paroxysmal explosions occurred, generating an eruptive column that quickly rose up to 5 km above sea level. Both events were detected by advanced local monitoring networks operated by Istituto Nazionale di Geofisica e Vulcanologia (INGV) and Laboratorio di Geofisica Sperimentale of the University of Firenze (LGS-UNIFI). Signals were also recorded by the Italian national seismic network at a range of hundreds of kilometres and by infrasonic arrays up to distances of 3700 km. Using state-of-the-art propagation modeling, we identify the various seismic and infrasound phases that are used for precise timing of the eruptions. We highlight the advantage of dense regional seismo-acoustic networks to enhance volcanic signal detection in poorly monitored regions, to provide timely warning of eruptions and reliable source amplitude estimate to Volcanic Ash Advisory Centres (VAAC).

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The European Arctic: A Laboratory for Seismoacoustic Studies

Cited by 4 publications

References 33 publications

Multi-instrument observations of the Pajala fireball: Origin, characteristics, and atmospheric implications

Multi-instrument observations of the Pajala fireball: Origin, characteristics, and atmospheric implications

Estimating tropospheric and stratospheric winds using infrasound from explosions

Using dense seismo-acoustic network to provide timely warning of the 2019 paroxysmal Stromboli eruptions

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