Results 161 to 170 of about 74,306 (189)

Direct dating of Quaternary phreatic maar eruptions by luminescence methods

Geology, 2011
The 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, Rufer, Daniel, Schreurs, Guido   +2 more
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Resuspension of ash after the 2014 phreatic eruption at Ontake volcano, Japan

Journal of Volcanology and Geothermal Research, 2018
Abstract 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, Takahiro Miwa, Masashi Nagai   +2 more
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The mechanism of phreatic eruptions

Journal of Geophysical Research: Solid Earth, 1995
We investigate the mechanism for initiating phreatic eruptions following the emplacement of a shallow magmatic intrusion into water‐saturated permeable rock which contains subsidiary low‐permeability crack networks and disconnected cracks. Heat from the intrusion causes the local groundwater to boil and ascend through the main permeable crack network ...
Leonid N. Germanovich, Robert P. Lowell
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A review on phreatic eruptions and their precursors

Journal of Volcanology and Geothermal Research, 1992
Abstract An analysis of the reported information on 132 historical phreatic events indicates that most of these (115) were not followed by a magmatic or phreatomagmatic eruption. Only in 18 cases precursory phenomena are reportedly lacking, whereas they are recognized for the majority (72) of the considered cases.
F. Barberi, A. Bertagnini, P. Landi, C. Principe   +3 more
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Phreatic eruptions of Ruapehu: April 1975

New Zealand Journal of Geology and Geophysics, 1979
Abstract 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

2023
Phreatic 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, Társilo Girona, Thomas Lecocq, Alberto Ardid, David Dempsey, Alexander Yates   +5 more
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Effects of concentrated and intense heavy rain on phreatic eruptions ～Based on a case study of the phreatic eruptions of Mt. Ontake in Japan-～

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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Phreatic eruptions and the influence of hydrothermal alteration on their processes

2016
Phreatic 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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Hydrothermal alteration and sealing at Turrialba as a mechanism for phreatic eruption triggering

2020
Stix, John (Supervisor)
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Experimental modelling of fragmentation processes within phreatic and hydrothermal eruptions

2012
Phreatic 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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