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GPS Detection and Energy Estimation of the Ionospheric Wave caused by the July 13th, 2003 Explosion of the Soufriere Hills Volcano, Montserrat

Dautermann, Thomas und Calais, Eric und Mattioli, Glen (2008) GPS Detection and Energy Estimation of the Ionospheric Wave caused by the July 13th, 2003 Explosion of the Soufriere Hills Volcano, Montserrat. Journal of Geophysical Research, 114 (B02202), . American Geophysical Union. DOI: 10.1029/2008JB005722.

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Offizielle URL: http://www.agu.org/journals/jb/jb0902/2008JB005722/

Kurzfassung

Volcanic explosions or shallow earthquakes are known to trigger acoustic and gravity waves that propagate in the atmosphere at infrasonic speeds. At ionospheric heights, coupling between neutral particles and free electrons induces variations of electron density detectable with dual-frequency GPS measurements. Using GPS data collected in the Caribbean, we identified an ionospheric perturbation following a major volcanic explosion at the Soufriere Hills Volcano (Montserrat, Lesser Antilles) on July 13, 2003. Spectral analysis reveals peaks centered at 1 mHz and 4 mHz, similar to previous observations and consistent with theory, suggesting both gravity and acoustic wave components. We retrieve a horizontal velocity of ~24 m/s for the acoustic component, which, implies upward propagation at ~33°, consistent with ray tracing results. We model the acoustic wave using a N-wave pressure source at ground level combined with ray-tracing to propagate the neutral pressure wave; this accounts for the dispersive characteristics of the atmosphere while conserving total acoustic energy. Plasma velocity is derived from neutral velocity using a finite difference solution of the magneto-hydrodynamic momentum equation. The continuity equation for charge densities is used to compute corresponding electron density variations, which are then numerically integrated along satellite-to-receiver line-of-sights, simultaneously accounting for the satellite displacements. We minimize the misfit between observed and model waveforms to estimate a total acoustic energy release of 1.53 10<sup>10</sup>J for the primary explosion event at Soufriere Hills Volcano associated with the peak dome collapse. This method can be applied to any explosion of sufficient magnitude, provided GPS data are available at near to medium range from the source.

Dokumentart:Zeitschriftenbeitrag
Titel:GPS Detection and Energy Estimation of the Ionospheric Wave caused by the July 13th, 2003 Explosion of the Soufriere Hills Volcano, Montserrat
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Dautermann, ThomasNICHT SPEZIFIZIERT
Calais, EricPurdue University
Mattioli, GlenUniversity of Arkansas
Datum:14 Mai 2008
Erschienen in:Journal of Geophysical Research
Band:114
DOI :10.1029/2008JB005722
Seitenbereich:
Verlag:American Geophysical Union
Name der Reihe:Solid Earth
Status:veröffentlicht
Stichwörter:Ionosphere, Explosion, GPS, TEC, raytracing, magnetohydrodynamics, Volcanism
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W - keine Zuordnung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):W -- keine Zuordnung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation
Institut für Kommunikation und Navigation > Navigation
Hinterlegt von: Dr. Thomas Dautermann
Hinterlegt am:05 Feb 2009
Letzte Änderung:12 Dez 2013 20:31

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