scholarly journals Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano—insights from ash samples

2013 ◽  
Vol 65 (6) ◽  
pp. 591-607 ◽  
Author(s):  
Yuki Suzuki ◽  
Masashi Nagai ◽  
Fukashi Maeno ◽  
Atsushi Yasuda ◽  
Natsumi Hokanishi ◽  
...  
Keyword(s):  
Kirishima Volcano ◽  
Precursory Activity

Brownish discoloration of the summit crater lake of Mt. Shinmoe-dake, Kirishima Volcano, Japan: volcanic–microbial coupled origin

2014 ◽  
Vol 76 (5) ◽  
Author(s):  
Shinji Ohsawa ◽  
Kenji Sugimori ◽  
Hiroshi Yamauchi ◽  
Tomoyuki Koeda ◽  
Hiroaki Inaba ◽  
...  
Keyword(s):  
Crater Lake ◽  
Summit Crater ◽  
Kirishima Volcano

Precursory activity of the 161 ka Kos Plateau Tuff eruption, Aegean Sea (Greece)

2010 ◽  
Vol 72 (6) ◽  
pp. 657-669 ◽  
Author(s):  
David J. W. Piper ◽  
Georgia Pe-Piper ◽  
Darren Lefort
Keyword(s):  
Aegean Sea ◽  
Precursory Activity

scholarly journals Integrating field, textural, and geochemical monitoring to track eruption triggers and dynamics: a case study from Piton de la Fournaise

Solid Earth ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 431-455 ◽  
Author(s):  
Lucia Gurioli ◽  
Andrea Di Muro ◽  
Ivan Vlastélic ◽  
Séverine Moune ◽  
Simon Thivet ◽  
...  
Keyword(s):  
Storage System ◽  
Storage Conditions ◽  
Magma Ascent ◽  
Magma Source ◽  
Piton De La Fournaise ◽  
Melt Separation ◽  
2014 Eruption ◽  
Volatile Exsolution ◽  
Precursory Activity

Abstract. The 2014 eruption at Piton de la Fournaise (PdF), La Réunion, which occurred after 41 months of quiescence, began with surprisingly little precursory activity and was one of the smallest so far observed at PdF in terms of duration (less than 2 days) and volume (less than 0.4  ×  106 m3). The pyroclastic material was composed of golden basaltic pumice along with fluidal, spiny iridescent and spiny opaque basaltic scoria. Density analyses performed on 200 lapilli reveal that while the spiny opaque clasts are the densest (1600 kg m−3) and most crystalline (55 vol. %), the golden pumices are the least dense (400 kg m−3) and crystalline (8 vol. %). The connectivity data indicate that the fluidal and golden (Hawaiian-like) clasts have more isolated vesicles (up to 40 vol. %) than the spiny (Strombolian-like) clasts (0–5 vol. %). These textural variations are linked to primary pre-eruptive magma storage conditions. The golden and fluidal fragments track the hotter portion of the melt, in contrast to the spiny fragments and lava that mirror the cooler portion of the shallow reservoir. Exponential decay of the magma ascent and output rates through time revealed depressurization of the source during which a stratified storage system was progressively tapped. Increasing syn-eruptive degassing and melt–gas decoupling led to a decrease in the explosive intensity from early fountaining to Strombolian activity. The geochemical results confirm the absence of new input of hot magma into the 2014 reservoir and confirm the emission of a single shallow, differentiated magma source, possibly related to residual magma from the November 2009 eruption. Fast volatile exsolution and crystal–melt separation (second boiling) were triggered by deep pre-eruptive magma transfer and stress field change. Our study highlights the possibility that shallow magma pockets can be quickly reactivated by deep processes without mass or energy (heat) transfer and produce hazardous eruptions with only short-term elusive precursors.

scholarly journals Deformations and Morphology Changes Associated with the 2016–2017 Eruption Sequence at Bezymianny Volcano, Kamchatka

2019 ◽  
Vol 11 (11) ◽  
pp. 1278 ◽  
Author(s):  
René Mania ◽  
Thomas R. Walter ◽  
Marina Belousova ◽  
Alexander Belousov ◽  
Sergey L. Senyukov
Keyword(s):  
Source Region ◽  
Integrated Approach ◽  
Close Monitoring ◽  
Density Currents ◽  
Bezymianny Volcano ◽  
Magma Supply ◽  
Data Resolution ◽  
Magmatic Intrusions ◽  
Precursory Activity ◽  
Magma Supply Rate

Lava domes grow by extrusions and intrusions of viscous magma often initiating from a central volcanic vent, and they are frequently defining the source region of hazardous explosive eruptions and pyroclastic density currents. Thus, close monitoring of dome building processes is crucial, but often limited to low data resolution, hazardous access, and poor visibility. Here, we investigated the 2016–2017 eruptive sequence of the dome building Bezymianny volcano, Kamchatka, with spot-mode TerraSAR-X acquisitions, and complement the analysis with webcam imagery and seismic data. Our results reveal clear morphometric changes preceding eruptions that are associated with intrusions and extrusions. Pixel offset measurements show >7 months of precursory plug extrusion, being locally defined and exceeding 30 m of deformation, chiefly without detected seismicity. After a short explosion, three months of lava dome evolution were characterised by extrusions and intrusion. Our data suggest that the growth mechanisms were significantly governed by magma supply rate and shallow upper conduit solidification that deflected magmatic intrusions into the uppermost parts of the dome. The integrated approach contributes significantly to a better understanding of precursory activity and complex growth interactions at dome building volcanoes, and shows that intrusive and extrusive growth is acting in chorus at Bezymianny volcano.

scholarly journals Shallow Magmatic Hydrothermal Eruption in April 2018 on Ebinokogen Ioyama Volcano in Kirishima Volcano Group, Kyushu, Japan

Geosciences ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 183 ◽  
Author(s):  
Yasuhisa Tajima ◽  
Setsuya Nakada ◽  
Fukashi Maeno ◽  
Toshio Huruzono ◽  
Masaaki Takahashi ◽  
...  
Keyword(s):  
Hydrothermal System ◽  
Hydrothermal Activity ◽  
Volcanic Field ◽  
Multiple Systems ◽  
Geothermal Activity ◽  
Hydrothermal Eruption ◽  
Kirishima Volcano ◽  
Geophysical Observation ◽  
Under The Volcano ◽  
Fluid Pressurization

The Kirishima Volcano Group is a volcanic field ideal for studying the mechanism of steam-driven eruptions because many eruptions of this type occurred in the historical era and geophysical observation networks have been installed in this volcano. We made regular geothermal observations to understand the hydrothermal activity in Ebinokogen Ioyama Volcano. Geothermal activity resumed around the Ioyama from December 2015. A steam blowout occurred in April 2017, and a hydrothermal eruption occurred in April 2018. Geothermal activity had gradually increased before these events, suggesting intrusion of the magmatic component fluids in the hydrothermal system under the volcano. The April 2018 eruption was a magmatic hydrothermal eruption caused by the injection of magmatic fluids into a very-shallow hydrothermal system as a bottom–up fluid pressurization, although juvenile materials were not identifiable. Additionally, the upwelling of mixed magma–meteoric fluids to the surface as a kick was observed just before the eruption to cause the top–down flashing of April 2018. A series of events was generated in the shallower hydrothermal regime consisting of multiple systems divided by conductive caprock layers.

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