Results 201 to 210 of about 146,104 (239)
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The mechanism of phreatic eruptions
Journal of Geophysical Research: Solid Earth, 1995We 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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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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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 24d, 03h 59m, N.Z.S.T. Only nine minutes of volcanic-seismic activity preceded the eruption, but crater dilation had been measured by a geodetic survey two weeks earlier. Bad weather prevented observation of the eruption.
I. A. Nairn, C. P. Wood, C. A. Y. Hewson
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Geophysical Research Letters, 2020
Since phreatic eruptions often occur near the surface, it is important to understand the shallow subsurface structure of a volcano to clarify the eruption mechanism.
K. Seki +10 more
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Since phreatic eruptions often occur near the surface, it is important to understand the shallow subsurface structure of a volcano to clarify the eruption mechanism.
K. Seki +10 more
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A review on phreatic eruptions and their precursors
Journal of Volcanology and Geothermal Research, 1992Abstract 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 +3 more
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Journal of Volcanology and Geothermal Research, 2021
Abstract More than 70 years observation of the SO42−/Cl− molar ratios of water from the Obuki hot spring in the vicinity of Mt. Akita-Yakeyama volcano indicated that the ratio started increasing rapidly from 1973, peaked in 1980 (SO42−/Cl− = 0.34), remained at high values for about 18 years, then gradually decreased and returned to a normal baseline ...
Akira Ueda +3 more
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Abstract More than 70 years observation of the SO42−/Cl− molar ratios of water from the Obuki hot spring in the vicinity of Mt. Akita-Yakeyama volcano indicated that the ratio started increasing rapidly from 1973, peaked in 1980 (SO42−/Cl− = 0.34), remained at high values for about 18 years, then gradually decreased and returned to a normal baseline ...
Akira Ueda +3 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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InSAR Imaging of White Island from 2014 to 2020: Insights into the 2019 Phreatic Eruption
, 2020At 14:11 NZDT (01:11 UTC) on 9 December 2019, an explosive eruption (VEI=2) occurred on White/Whakaari Island in New Zealand’s northeast Bay of Plenty.
Yunmeng Cao +7 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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Shallow dolerite intrusion and phreatic eruption in the Allan Hills region, Antarctica
New Zealand Journal of Geology and Geophysics, 1974Abstract Shallow intrusion of dolerite sills into porous and permeable Permian-Triassic strata in the Allan Hills region resulted in steam pressures which exceeded that of the roof rocks causing fracturing and fluidisation of the sediments and the formation of volcanic mudflows and explosion breccias.
R. H. Grapes +2 more
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