Results 21 to 30 of about 4,124 (186)
Geophysical Research Letters, 2023 A pyroclastic density current (PDC) is characterized by its strong stratification of particle concentration; it consists of upper dilute and lower dense currents, which generally control the dynamics and deposits of PDCs, respectively.
Hiroyuki A. Shimizu +2 more
doaj +1 more source
Phreatomagmatic explosions of rhyolitic magma: Experimental and field evidence [PDF]
Journal of Geophysical Research: Solid Earth, 2008 Experimental studies on explosive molten fuel‐coolant interaction (MFCI) using basaltic melt compositions and water as the coolant have provided insight into the physical processes of basaltic and andesitic phreatomagmatic volcanism. Abundant field evidence indicates that rhyolitic and dacitic phreatomagmatism occurs in nature, but it has not been ...
AUSTIN ERICKSON A +4 more
openaire +2 more sources
The geology and geochronology of Al Wahbah maar crater, Harrat Kishb, Saudi Arabia [PDF]
, 2014 Al Wahbah is a large (∼2.2 km diameter, ∼250 m deep) maar crater in the Harrat Kishb volcanic field in western Saudi Arabia. It cuts Proterozoic basement rocks and two Quaternary basanite lava flows, and is rimmed with an eroded tuff ring of debris from ...
Abdel Wahab, Antar +4 more
core +1 more source
Frontiers in Earth Science, 2018 At Kawah Ijen (Indonesia), vigorous SO2 and HCl degassing sustains a hyperacid lake (pH ~0) and intensely alters the subsurface, producing widespread residual silica and advanced argillic alteration products.
Jacob B. Lowenstern +6 more
doaj +1 more source
Survival of the Mýrdalsjökull ice cap through the Holocene thermal maximum: evidence from sulphur contents in Katla tephra layers (Iceland) from the last ∼8400 years [PDF]
, 2007 International audienceThe climate in Iceland was drier and warmer during the Holocene thermal maximum than it is today and it has been suggested that ice caps disappeared entirely. Katla, a volcano covered by the Mýrdalsjökull ice cap in southern Iceland,
Bergrun A. Oladottir +16 more
core +4 more sources
Sakurajima-Satsuma (Sz-S) and Noike-Yumugi (N-Ym) tephras: new tephrochronological marker beds for the last deglaciation, southern Kyushu, Japan [PDF]
, 2011 Two prominent tephras, Sakurajima-Satsuma (Sz-S) erupted from Sakurajima volcano and Noike-Yumugi (N-Ym) erupted from Kuchierabujima Island, provide new key marker beds for dating and synchronizing palaeoenvironmental and archaeological records in the ...
Ikehara, Minoru +5 more
core +2 more sources
Geosciences, 2020 Maar volcanoes are monogenetic landforms whose craters cut below the pre-eruptive surface and are surrounded by a tephra ring. Both the maar crater and the surrounding tephra rim deposits are typically formed due to magma–water explosive interactions ...
Gabriel Ureta +3 more
doaj +1 more source
Determining the Volcanic Eruption Style of Tephra Deposits From Infrared Spectroscopy
Earth and Space Science, 2021 Orbital imagery and spectroscopy at Mars have identified a variety of deposits potentially consistent with volcanic tephra formed during explosive volcanic eruptions, and some of these deposits may have formed due to water‐ or ice‐magma interactions ...
M. J. B. Henderson +4 more
doaj +1 more source
Ignimbrite Analyses of Batur Caldera, Bali, based on 14C Dating
Indonesian Journal on Geoscience, 2014 http://dx.doi.org/10.17014/ijog.vol4no3.20094The Batur Caldera, in the northeastern part of Bali Island, is an elliptical collapse structure 13.8 by 10 km in size and another circular composite collapse structure with a diameter of 7.5 km in its centre ...
Igan S. Sutawidjaja
doaj +1 more source
ASHFALL DISPERSAL MAPPING OF THE 2020 TAAL VOLCANO ERUPTION USING DIWATA-2 IMAGERY FOR DISASTER ASSESSMENT [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021 Natural disasters incur many fatalities and economic losses for vulnerable and developing countries such as the Philippines. It is crucial that during calamities, on-ground surveillance is supplemented by low-cost and time-efficient methods such as ...
E. J. G. Merin +5 more
doaj +1 more source