C. Gunawan, P. Contributed, J. S. Yogyakarta, D. S. , J. G. Especially et al., acknowledge the support of USAID's Office of Foreign Disaster Assistance to the Volcano Disaster Assistance Program for collaborative work in Indonesia Embassy and USAID mission in Jakarta for their assistance and support, as well as colleagues in the USGS Advanced Systems Center and Alaska Volcano Observatory for their remote sensing support is a Postdoctoral Researcher with F.R.S.-FNRS. Indyo Pratomo provided ash samples for rock analysis. P. J. acknowledges the French Embassy in Jakarta for the support for the mission extension during the eruption. P.J. is also grateful to Marie Le Sourd (Lembaga Indonesia Perancis Wegler and an anonymous reviewer for their careful reviews of the manuscript, which improved it, Adrien Picquout and Valérie Diard for their strong support in Yogyakarta, and many BRGM colleagues for remote support and advices. We thank Cynthia Werner

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