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| Titel |
Comparison of nonlinear infrasound propagation models with observations |
| VerfasserIn |
J. Lonzaga, R. Waxler, P. Blom, J. Assink |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069624
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| Zusammenfassung |
| An algorithm has been written to numerically solve the nonlinear transport equation for
infrasonic propagation in the atmosphere as previously derived by Robinson (Ph.D. Thesis,
Univ. of Texas, 1991) and Gaineville (Ph.D. Thesis, École Centrale de Lyon, 2008). This
algorithm is used to analyze data obtained from recent Tungurahua volcanic eruptions in
Ecuador and from Trident Missile rocket motor fuel elimination events in Utah and the recent
100 ton Sayrim (2011) experiment. Tropospheric, stratospheric, and thermospheric arrivals
are studied. The algorithm is used to estimate the amplitude of the source, dominant
frequency of the received signal, and the attenuation in the thermosphere. Tropospheric
arrivals show little nonlinear distortion. Stratospheric arrivals show nonlinear distortion for
sufficiently high amplitude signals. Thermospheric arrivals are stongly distorted. Analysis of
thermospheric arrivals indicates that the Sutherland-Bass model seems to overestimate
the attenuation in the thermosphere. It also shows that the dominant frequency of
the signal received decreases as the return heights of the signal increases in the
thermosphere. An overview of the results and copmparisons with data will be presented. |
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