Application of Propagation Modeling to Verify and Discriminate Ground-Truth Infrasound Signals at Regional Distances
Open Access
- 1 January 2013
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in InfraMatics
- Vol. 02 (04), 39-55
- https://doi.org/10.4236/inframatics.2013.24004
Abstract
An infrasound field campaign was performed in 2011/2012 utilizing single infrasound sensors along the great circle path between a known ground-truth source (Ariane 5 engine test facility, Lampoldshausen, Germany) and a regional receiver (German infrasound array IS26, Bavarian Forest) covering a distance of rough 320 km in total. The gathered recordings provide new insights in the infrasonic wave propagation at regional and near-source distances by comparing measured signals with modeling results within this study. Ray-tracing and parabolic equation approaches are utilized to model infrasound propagation from the ground-truth source to the line profile sensors and explain the obtained detections and non-detections. Modeling and observation results are compared by estimating their amplitude, quantifying amplitude deviations and also considering observed and calculated travel times and celerities. Modeling results show a significant influence of small-scale atmospheric variations in effective sound speed profiles on the propagation pattern, which results in varying tropospheric and stratospheric ducting behavior. A large number of gravity wave profiles are tested to investigate the influences of atmospheric dynamics on the infrasound wave field and improve the modeling results. The modeling is furthermore applied to a case of two potential, contemporaneous and closely spaced infrasound sources. Propagation modeling is used here to resolve the source ambiguity between a ground-based and a higher altitude source giving a strong preference to the latter with respect to the observed infrasonic signatures. The good agreement between modeling and observation results within this study successfully shows the benefit of applying infrasound propagation modeling to the validation of infrasound measurements, verification of ducting behavior and discrimination of infrasound sources.Keywords
This publication has 27 references indexed in Scilit:
- The 2013 Russian fireball largest ever detected by CTBTO infrasound sensorsGeophysical Research Letters, 2013
- A study of infrasonic anisotropy and multipathing in the atmosphere using seismic networksPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2013
- Remote Infrasound Monitoring of Mount Etna: Observed and Predicted Network Detection CapabilityInfraMatics, 2013
- Infrasound: Connecting the Solid Earth, Oceans, and AtmosphereAnnual Review of Earth and Planetary Sciences, 2012
- Topographic effects on infrasound propagationThe Journal of the Acoustical Society of America, 2012
- Long-range acoustic observations of the Eyjafjallajökull eruption, Iceland, April-May 2010Geophysical Research Letters, 2011
- Infrasound Propagation in the "Zone of Silence"Seismological Research Letters, 2010
- Infrasound from tropospheric sources: Impact on mesopause temperature?Journal of Atmospheric and Solar-Terrestrial Physics, 2009
- Seismo-acoustic analysis of the Buncefield oil depot explosion in the UK, 2005 December 11Geophysical Journal International, 2008
- NRLMSISE‐00 empirical model of the atmosphere: Statistical comparisons and scientific issuesJournal of Geophysical Research, 2002