Short term precursors of Strombolian explosions at Yasur volcano (Vanuatu)
Battaglia Jean, Métaxian Jean-Philippe, Garaebiti Esline. 2016-03-16. .
ARTICLE, (2016-03-16 ) - PUBLISHEDVERSION - English (en-GB)
OPENACCESS -
info:eu-repo/semantics/OpenAccess.
Audience : OTHER
HAL CCSD, American Geophysical Union
Sujet
[SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology
Domaines
Géologie, Volcanologie, Sciences de la Terre
Description
International audience The seismic wavefield associated with Strombolian activity is usually dominated by explosion quakes (EQs), tremor, and various signals generated by surface phenomena. Looking at the seismicity recorded at Yasur volcano in 2008, we found that beside the transient events which occur simultaneously with surface explosions, the seismicity includes events related to a deeper process. These long period (LP) events form a family of similar events located below the southeastern part of the crater rim at a depth of about 700–1200 m below the summit. They are commonly followed by EQs with a variable delay. The examination of about 20,000 LP-EQ sequences at several stations near the summit shows that interevent delays follow distributions peaked around 11–12 s. This short delay compared to the relatively great source depth of the LPs favors a causal relationship linked to pressure transfer rather than gas slug propagation after nucleation at the LP source.
Auteurs
Battaglia, Jean, Métaxian, Jean-Philippe, Garaebiti, Esline
Contributeurs
Laboratoire Magmas et Volcans (LMV) ; Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre) ; Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Vanuatu Meteorological and Gehazards Department ; Vanuatu Meteorological and Gehazards Department
Sources
ISSN: 0094-8276, EISSN: 1944-8007, Geophysical Research Letters, https://hal.uca.fr/hal-01636977, Geophysical Research Letters, 2016, 43 (5), pp.1960 - 1965. ⟨10.1002/2016GL067823⟩
Relation
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GL067823
