Results 91 to 100 of about 78,518 (194)

Results of geochemical monitoring of the activity of Ebeko volcano (Kurile Islands) used for eruption prediction [PDF]

, 1985
The monitoring of the state of active volcanoes, carried out using different parameters, including geochemical, is very important for studies of deep processes and geodynamics.
Menyailov I.A., Nikitina L.P., Shapar V.N.   +2 more
core   +1 more source

Source constraints for the 2015 phreatic eruption of Hakone volcano, Japan, based on geological analysis and resistivity structure

Earth, Planets and Space, 2019
On June 29, 2015, a small phreatic eruption occurred in the most intensively steaming area of Hakone volcano, Japan. A previous magnetotelluric survey for the whole volcano revealed that the eruption center area (ECA) was located near the apex of a bell ...
Kazutaka Mannen, Toshikazu Tanada, Akira Jomori, Takashi Akatsuka, George Kikugawa, Yui Fukazawa, Hiroyuki Yamashita, Koichiro Fujimoto   +7 more
doaj   +1 more source

Sensitivity to lunar cycles prior to the 2007 eruption of Ruapehu volcano

Scientific Reports, 2018
A long-standing question in Earth Science is the extent to which seismic and volcanic activity can be regulated by tidal stresses, a repeatable and predictable external excitation induced by the Moon-Sun gravitational force.
Társilo Girona, Christian Huber, Corentin Caudron   +2 more
doaj   +1 more source

ZINC ENRICHMENT IN THE PHREATIC ASHES OF MT. ST. HELENS, APRIL 1980 [PDF]

, 1982
Micrometer-size condensate particles consisting of zincite (ZnO) with possibly minor zinc silicate occur in the phreatic ashes of Mt. St. Helens that were deposited in early April 1980.
Ellen Thomas, Peter R Buseck, Johan C Varekamp   +2 more
core  

Origins and significance of alteration textures in hydrovolcanic products from active volcanoes

Earth, Planets and Space
While mineralization processes in hydrothermal systems have been studied intensively from the viewpoint of economic geology, the composition, and textures of hydrothermally altered materials in hydrovolcanic ash have not been fully analyzed in active ...
Yusuke Minami, Nobuo Geshi
doaj   +1 more source

Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

, 2017
In the present study, we analyze the seismic signals from a continuous volcanic tremor that occurred during a small phreatic eruption of the Hakone volcano, in the Owakudani geothermal region of central Japan, on June 29, 2015.
Ryou Honda, Masatake Harada, Ryosuke Doke, Yuichi Morita, Tatsuhiko Saito, Shin’ichi Sakai, Yohei Yukutake, Tomotake Ueno   +7 more
core   +1 more source

Seismic signature of a phreatic explosion: hydrofracturing damage patterns at Karthala volcano, Comores Islands, Indian ocean.

, 2005
Karthala volcano is a basaltic shield volcano with an active hydrothermal system that forms the southern two-thirds of the Grande Comore Island, off the east coat of Africa, northwest of Madagascar.
Bachèlery, Patrick, Savin, C., Grasso, Jean-Robert   +2 more
core   +1 more source

Time Varying Crustal Anisotropy at Whakaari/White Island Volcano

Geophysical Research Letters
Whakaari/White Island has been the most active New Zealand volcano in the 21st century, producing small phreatic and phreatomagmatic eruptions, which are hard to predict.
D. Y. Mengesha, M. K. Savage, A. D. Jolly, C. J. Ebinger   +3 more
doaj   +1 more source

A numerical model for precursory time sequences of the phreatic eruptions of Mt. Ontake, central Japan

Earth, Planets and Space
The 2014 phreatic eruption of Mt. Ontake was preceded by increased volcano-tectonic (VT) seismicity, but all other types of precursors were obscure. A subsurface process leading to eruption with few precursors has yet to be identified.
Yuta Maeda
doaj   +1 more source

Geological study of phreatic eruptions

The Journal of the Geological Society of Japan, 2018
Teruki Oikawa, Tsukasa Oba, Akihiko Fujinawa, Hisashi Sasaki   +3 more
openaire   +2 more sources