Results 141 to 150 of about 308 (170)
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Phreatic eruptions of Ruapehu: April 1975
New Zealand Journal of Geology and Geophysics, 1979Abstract A major phreatic eruption occurred in Ruapehu Crater Lake, North Island, New Zealand, at 1975 April 24 d , 03 h 59 m , N.Z.S.T.
I. A. Nairn, C. P. Wood, C. A. Y. Hewson
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Towards monitoring phreatic eruptions using seismic noise
2023Phreatic and hydrothermal eruptions remain among the most difficult to forecast. The frequent absence of clear precursor signals challenges volcanologists' ability to provide timely and accurate hazard advice. They remain poorly understood and have recently caused human fatalities.
Corentin Caudron +5 more
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2023
"This paper is a non-peer reviewed preprint submitted to EarthArXiv"For humans living in an economic zone adjacent to volcanoes, the reality of unpredictable eruptions is a constant concern. This paper presents a new view on the phreatic eruption process of Mt. Ontake, Japan.
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"This paper is a non-peer reviewed preprint submitted to EarthArXiv"For humans living in an economic zone adjacent to volcanoes, the reality of unpredictable eruptions is a constant concern. This paper presents a new view on the phreatic eruption process of Mt. Ontake, Japan.
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Journal of Volcanology and Geothermal ResearchSteam-driven eruptions, such as phreatic and hydrothermal explosions, likely represent some of the most frequent eruptive styles at stratovolcanoes. However, deciphering their timing, dynamics, and underlying mechanisms from eruptive deposits remains a significant challenge, even when, although such deposits are thin, altered, poorly dispersed, and ...
Paolo Fulignati +2 more
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Direct dating of Quaternary phreatic maar eruptions by luminescence methods
Geology, 2011The suitability of quartz optically stimulated luminescence (OSL) and feldspar infrared stimulated luminescence (IRSL) for the direct dating of phreatic eruptions was tested on examples from the Eifel Volcanic Field, Germany. The mean IRSL age of 11.6 ± 0.5 ka for Ulmener Maar Tephra is in excellent agreement with the independent age control (11 ± 0.1 ...
Preusser, Frank +2 more
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Phreatic eruptions and the influence of hydrothermal alteration on their processes
2016Phreatic eruptions are possibly the most drastic surface expressions of hydrothermal activity within active epithermal systems (geothermal fields), and they are still poorly understood. Various phenomena, such as fumaroles, hot springs, mud pools, and soil encrustations represent further obvious features of the interaction between outgassing ...
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Resuspension of Ash After the 2014 Phreatic Eruption at Ontake Volcano, Japan
Journal of Volcanology and Geothermal Research, 2018Abstract We determined the resuspension process of an ash deposit after the phreatic eruption of September 27th, 2014 at Ontake volcano, Japan, by analyzing the time series data of particle concentrations obtained using an optical particle counter and the characteristics of an ash sample.
Ryohei Kawaguchi +2 more
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Hydrothermal alteration and sealing at Turrialba as a mechanism for phreatic eruption triggering
2020Stix, John (Supervisor)
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Experimental modelling of fragmentation processes within phreatic and hydrothermal eruptions
2012Phreatic and hydrothermal eruptions often occur with little or no warning representing a significant hazard within geothermal regions. These violent eruptions occur at a range of temperatures and pressures within varying rock types. A range of mechanisms including heating or decompression, allows hydrothermal/supercritical fluid to rapidly flash to ...
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