Bulletin of Volcanology

, Volume 66, Issue 2, pp 95–133 | Cite as

Complex proximal deposition during the Plinian eruptions of 1912 at Novarupta, Alaska

  • Bruce F. HoughtonEmail author
  • C. J. N. Wilson
  • J. Fierstein
  • W. Hildreth
Research Article


Proximal (<3 km) deposits from episodes II and III of the 60-h-long Novarupta 1912 eruption exhibit a very complex stratigraphy, the result of at least four transport regimes and diverse depositional mechanisms. They contrast with the relatively simple stratigraphy (and inferred emplacement mechanisms) for the previously documented, better known, medial–distal fall deposits and the Valley of Ten Thousand Smokes ignimbrite. The proximal products include alternations and mixtures of both locally and regionally dispersed fall ejecta, and numerous thin complex deposits of pyroclastic density currents (PDCs) with no regional analogs. The locally dispersed component of the fall deposits forms sector-confined wedges of material whose thicknesses halve radially from and concentrically about the vent over distances of 100–300 m (cf. several kilometers for the medial–distal fall deposits). This locally dispersed fall material (and many of the associated PDC deposits) is rich in andesitic and banded pumices and richer in shallow-derived wall-rock lithics in comparison with the coeval medial fall units of almost entirely dacitic composition. There are no marked contrasts in grain size in the near-vent deposits, however, between locally and widely dispersed beds, and all samples of the proximal fall deposits plot as a simple continuation of grain size trends for medial–distal samples. Associated PDC deposits form a spectrum of facies from fines-poor, avalanched beds through thin-bedded, landscape-mantling beds to channelized lobes of pumice-block-rich ignimbrite. The origins of the Novarupta near-vent deposits are considered within a spectrum of four transport regimes: (1) sustained buoyant plume, (2) fountaining with co-current flow, (3) fountaining with counter-current flow, and (4) direct lateral ejection. The Novarupta deposits suggest a model where buoyant, stable, regime-1 plumes characterized most of episodes II and III, but were accompanied by transient and variable partitioning of clasts into the other three regimes. Only one short period of vent blockage and cessation of the Plinian plume occurred, separating episodes II and III, which was followed by a single PDC interpreted as an overpressured "blast" involving direct lateral ejection. In contrast, regimes 2 and 3 were reflected by spasmodic sedimentation from the margins of the jet and perhaps lower plume, which were being strongly affected by short-lived instabilities. These instabilities in turn are inferred to be associated with heterogeneities in the mixture of gas and pyroclasts emerging from the vent. Of the parameters that control explosive eruptive behavior, only such sudden and asymmetrical changes in the particle concentration could operate on time scales sufficiently short to explain the rapid changes in the proximal 1912 products.


Eruption plume Ignimbrite Novarupta 1912 eruption Plinian eruption Pyroclastic density current 



This manuscript was significantly improved by comments from Nancy Adams, Costanza Bonadonna, Raffaello Cioni, Piero Dellino, Cynthia Gardner, Chris Waythomas and, especially, Scott Bryan. Michelle Coombs was a partner in the new fieldwork required to complete this project. Bruce Houghton's contribution was supported by NSF Award EAR-01-06700 and Colin Wilson's by grants from the New Zealand Foundation for Science, Research and Technology. Personnel from Katmai National Park and Preserve have helped with a variety of logistics over the years, and the Fish and Wildlife Service supplied excellent accommodation in King Salmon. John Paskievitch was instrumental in arranging helicopter support, which made access to difficult places and transport of samples possible.


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Bruce F. Houghton
    • 1
    Email author
  • C. J. N. Wilson
    • 2
  • J. Fierstein
    • 3
  • W. Hildreth
    • 3
  1. 1.Department of Geology and Geophysics, SOESTUniversity of HawaiiHonoluluUSA
  2. 2.Institute of Geological and Nuclear SciencesLower HuttNew Zealand
  3. 3.Volcano Hazards ProgramUS Geological SurveyMenlo ParkUSA

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