资源环境科技发展态势分析平台

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, similar to 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 (similar to 5 km) magmatic systems. Extension of similar to 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 (similar to 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.