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Laboratory simulations of sustained volcanic eruptions

Nature volume 388, pages 462–464 (1997)Cite this article

Abstract

Many violent eruptions are driven by rapid exsolution of dissolved volatiles within liquid magma. The accelerating two-phase mixture emerges at the vent as a sustained quasi-steady discharge lasting for periods from hours to days (refs 1, 2). The initial growthin discharge rate commonly observed2,3,4, subsequent fluctuations5,6 and discrete pulses and shocks7 remain largely unexplained. We have simulated volcanic conduit flows by producing sustained, quasi-steady explosions in a liquid undergoing rapid exsolution of a gas. This was done by rapidly decompressing large volumes of CO2-saturated water. The results reveal fluctuations in discharge rate that reflect heterogeneities in the two-phase mixture that form spontaneously as a consequence of the size and geometry of the experimental system. An initial transient with a growing discharge rate is observed in experiments in which material is erupted from a spherical flask up a narrow neck that mimics the magma-chamber/conduit assembly of volcanic systems. The fragmentation region propagates down the neck during the initial transient until it reaches a stable position at the top of the flask, at which point a quasi-steady discharge ensues.

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Figure 1: Experimental apparatus.
Figure 2: Photographs of results using the flask apparatus (Fig. 1b).
Figure 3: Photographs of results from the constricted-tube apparatus (Fig. 1a).
Figure 4: Velocity at the neck entrance of the flask (Fig. 1b) as a function of time.

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Acknowledgements

We thank L. Wilson for comments. E.B. was supported by a National Science Foundation graduate fellowship.

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Authors and Affiliations

  1. Department of Geology, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, UK

    H. M. Mader

  2. Seismological Laboratory, California Institute of Technology, Pasadena, 91125, California, USA

    E. E. Brodsky

  3. Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, 91125, California, USA

    D. Howard & B. Sturtevant

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  1. H. M. Mader
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Correspondence to H. M. Mader.

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Mader, H., Brodsky, E., Howard, D. et al. Laboratory simulations of sustained volcanic eruptions. Nature 388, 462–464 (1997). https://doi.org/10.1038/41306

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