Results 201 to 210 of about 132,968 (237)

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
openaire   +1 more source

First detection of precursory ground inflation of a small phreatic eruption by InSAR

Earth and Planetary Science Letters, 2018
Tomokazu Kobayashi, Yu Morishita
exaly   +2 more sources

Tamagawa hyper-acidic hot spring and phreatic eruptions at Mt. Akita-Yakeyama Volcano: Part 2. Secular variations of SO4/Cl ratios and their relationship to the phreatic eruptions

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, Toshiaki Tanaka, Minoru Kusakabe, Takafumi Furukawa   +3 more
openaire   +1 more source

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
openaire   +2 more sources

InSAR Imaging of White Island from 2014 to 2020: Insights into the 2019 Phreatic Eruption

, 2020
At 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, D. Trippanera, Xing Li, A. Nobile, Z. Yunjun, L. Passarelli, Wenbin Xu, S. Jónsson   +7 more
semanticscholar   +1 more source

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.
openaire   +1 more source

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.
Takahiro Miwa, Masashi Nagai, Ryohei Kawaguchi   +2 more
openaire   +1 more source

Shallow dolerite intrusion and phreatic eruption in the Allan Hills region, Antarctica

New Zealand Journal of Geology and Geophysics, 1974
Abstract 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, D. L. Reid, J. G. McPherson   +2 more
openaire   +1 more source

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 ...
openaire   +2 more sources

Pyroclastic density current from the 1888 phreatic eruption of Bandai volcano, NE Japan

Journal of Volcanology and Geothermal Research, 1999
Abstract The great eruption of July 15, 1888 at Bandai volcano produced large phreatic explosions and a major debris avalanche toward the northern foot. This eruption is characterized as follows: (1) there was no significant precursor; (2) the eruption and collapse of the volcanic edifice were triggered by an earthquake with a magnitude of about 5 ...
Takahiro Yamamoto, Yoichi Nakamura, Harry Glicken   +2 more
openaire   +1 more source