| Titre | Dike model for the 2012 - 2013 Tolbachik eruption constrained by satellite radar interferometry observations |
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| Auteur | Lundgren, P; Kiryukhin, A; Milillo, P; Samsonov, S V |
| Source | Journal of Volcanology and Geothermal Research vol. 307, 2015 p. 79-88, https://doi.org/10.1016/j.jvolgeores.2015.05.011 |
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| Année | 2015 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20170204 |
| Éditeur | Elsevier BV |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.jvolgeores.2015.05.011 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Région | Kamchatka |
| Lat/Long OENS | -160.5500 -160.0833 55.9167 55.5500 |
| Sujets | volcans; études volcaniques; caractéristiques volcaniques; filons rocheux; fissures; sismicité; télédétection; établissement de modèles |
| Illustrations | images satellitaires; cartes de localisation; graphiques; modèles 3D; histogrammes |
| Résumé | (disponible en anglais seulement)
A large dike intrusion and fissure eruption lasting 9 months began on November 27, 2013, beneath the south flank of Tolbachik Volcano, Kamchatka, Russia. The
eruption was the most recent at Tolbachik since the Great Tolbachik Eruption from 1975 to 1976. The 2012 eruption was preceded by more than 6 months of seismicity that clustered beneath the east flank of the volcano along a NW - SE trend. Seismicity
increased dramatically before the eruption, with propagation of the seismicity from the central volcano conduit in the final hours. We use interferometric synthetic aperture radar (InSAR) to compute relative displacement images (interferograms) for
SAR data pairs spanning the eruption. We use satellite SAR data from the Canadian Space Agency's RADARSAT-2 and from the Italian Space Agency's COSMO-SkyMed missions. Data are modeled first through a Markov Chain Monte Carlo solution for a single
tensile dislocation (dike). We then use a boundary element method that includes topography to model a distributed dike-opening model. We find the best-fitting dike dips 80° to the WNW with maximum opening of 6 - 8 m, localized in the near surface and
more broadly distributed in distinct regions up to 3 km beneath the surface, which varies from 1 to 2 km elevation for the eruptive fissures. The distribution of dike opening and its correspondence with co-diking seismicity suggests that the dike
propagated radially from Tolbachik's central conduit. |
| GEOSCAN ID | 305974 |
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