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Birth of a lava lake: Nyamulagira volcano 2011–2015

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Abstract

Since 1938, Nyamulagira volcano (Democratic Republic of Congo) has operated as a classic pressurized basaltic closed system, characterized by frequent dike-fed flank eruptions. However, on June 24, 2014, an active lava lake was observed in its summit, after a period of 76 years. The small lava lake is now exposed at the bottom of a pit-crater and is rising and growing. Based on satellite-derived infrared (IR) data, SO2 fluxes and periodic field surveys, we provide evidence that the development of the lava lake was gradual and occurred more than 2 years before it was first observed in the field. Notably, this process followed the voluminous 2011–2012 distal flank eruption and was coeval with weakening of the central rock column below the summit. Hence, the opening and development of the pit-crater favoured the continuous rise of fresh magma through the central conduit and promoted the gradual “re-birth” of the Nyamulagira lava lake. Budgeted volumes of magma erupted, and magma degassed at depth indicate that the formation of the lava lake is due to the draining and refilling of a shallow plumbing system (1–2 km depth), probably in response to the rift-parallel 2011–2012 distal eruption. We thus suggest that the transition from lateral to central activity did not result from a substantial change in the magma supply rate but, more likely, from the perturbation of the plumbing system (and related stress field) associated with the distal eruption. The processes observed at Nyamulagira are not unique and suggest that rift-fissure eruptions, in addition to triggering caldera collapses or lava lake drainages, may also induce a progressive resumption of central vent activity. Current activity at Nyamulagira represents a tangible and major hazard for the population living at the base of its southern flank.

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Acknowledgements

MIROVA is a collaborative project between the Universities of Turin and Florence (Italy) and is supported by the Centre for Volcanic Risk of the Italian Civil Protection Department. Additional funds were provided by MIUR; additional funds for improving our computing hardware were provided by Fondazione Cassa di Risparmio di Torino. We thank J.D.L. White, M. Patrick and two anonymous reviewers for their constructive comments that strongly improved this work. We are grateful to G. Wadge and L. Spaminato for their helpful suggestions on an early version of this manuscript. We acknowledge the LANCE-MODIS system (http://lance-modis.eosdis.nasa.gov/) for providing Level 1B MODIS data. Thanks to UN-MONUSCO flights, European Union-Kinshasa (DRC) and I.O.M. for their support.

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Authors and Affiliations

  1. Earth Science Department (DST), University of Turin, Turin, Italy

    D. Coppola, M. Laiolo & C. Cigolini

  2. Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad de México, D.F., Mexico

    R. Campion

  3. Earth Science Department (DST), University of Florence, Florence, Italy

    M. Laiolo & M. Ripepe

  4. DISTABIF, Second University of Naples, Caserta, Italy

    E. Cuoco, C. Balagizi & D. Tedesco

  5. Geochemistry and Environment Department, Goma Volcano Observatory, Goma, Democratic Republic of Congo

    C. Balagizi

  6. NatRisk, Centro Interdipartimentale sui Rischi Naturali in Ambiente Montano e Collinare, University of Torino, Torino, Italy

    C. Cigolini

  7. International Organization of Migrants, Geneva, Switzerland

    D. Tedesco

  8. Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy

    D. Tedesco

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  1. D. Coppola
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Correspondence to D. Coppola.

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Coppola, D., Campion, R., Laiolo, M. et al. Birth of a lava lake: Nyamulagira volcano 2011–2015. Bull Volcanol 78, 20 (2016). https://doi.org/10.1007/s00445-016-1014-7

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