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Large‐Scale Drainage of a Complex Magmatic System: Observations From the 2018 Eruption of Ambrym Volcano, Vanuatu
Author(s) -
Hamling Ian J,
Cevuard Sandrine,
Garaebiti Esline
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl082606
Subject(s) - geology , dike , caldera , volcano , seismology , rift zone , lateral eruption , intrusion , rift , magma , subsidence , geomorphology , petrology , geochemistry , tectonics , explosive eruption , structural basin
In late 2018, Ambrym volcano, Vanuatu, erupted for the first time in 3 years. We show that the eruption was the result of a 6.5‐m‐wide, ∼0.7‐km 3 dike intrusion which propagated for more than 20 km into the eastern rift zone. The eruptive sequence began with a small shallow dike within the main caldera but ultimately triggered a much larger intrusion, draining both the shallow (1–2 km) and deeper (∼5 km) magmatic systems. Extension of ∼3 m is estimated across the eastern rift zone with more than 2 m of subsidence within the caldera. Modeling suggests that the stress changes induced by the initial dike emplacement helped trigger and guide the propagation of the flank intrusion. Despite the large volume of material removed from beneath the caldera (∼0.7 km 3 ), limited slip is observed along bounding faults supporting the hypothesis that the long‐term formation of the caldera at Ambrym is a result of repeated moderate‐sized events.