Results 11 to 20 of about 824,803 (284)

Distict element numerical modelling of volcanic debris avalanche emplacement geomechanics. [PDF]

open access: yes
Catastrophic collapse of volcanic edifices is a relatively common phenomenon in the geological record, representing the largest subaeriallandsliding events on Earth.
Thompson, Nicholas Darrell
core   +9 more sources

Volcanic and sedimentary processes in phreatomagmatic volcanoes [PDF]

open access: yes, 1982
Phreatomagmatic volcanoes form when ascending magma explosively interacts with surface or groundwater at shallow depths. Three types of phreatomagmatic activity are recognised- phreaticp phreatomagmatic (s. s. ) and surtseyan - based on the degree of
Leys, C.A., Leys, Clyde Andrew
core   +7 more sources

How will melting of ice affect volcanic hazards in the 21st century? [PDF]

open access: yes, 2010
Glaciers and ice sheets on many active volcanoes are rapidly receding. There is compelling evidence that melting of ice during the last deglaciation triggered a dramatic acceleration in volcanic activity.
Tuffen, Hugh
core   +4 more sources

Experimental study on propagation of hydraulic fracture in volcanic rocks using industrial CT technology

open access: yesPetroleum Exploration and Development, 2013
To understand the planar and three-dimensional geometry of hydraulic fractures in volcanic rocks, a hydraulic fracturing simulation experiment was conducted using the large-scale triaxial hydraulic fracturing test system in laboratory.
Lichun JIA   +7 more
doaj   +1 more source

Chemical classification of common volcanic rocks based on degree of silica saturation and CaO/K2O ratio

open access: yesAnais da Academia Brasileira de Ciências, 2021
Modal classifications of common volcanic rocks are expensive, difficult, or impossible to attain. As a consequence, these rocks are classified using the chemical composition.
JOÃO O.S. SANTOS, LÉO A. HARTMANN
doaj   +1 more source

Electric charge within volcanic plumes on Earth and Io [PDF]

open access: yes, 1998
Field, experimental and theoretical investigations have been carried out into the electrification of volcanic plumes. At Sakurajima volcano, Japan, ground-level perturbations of the atmospheric electric potential gradient generated by particulate plumes ...
James, M.R., James, M. R.
core   +4 more sources

Geomechanical characterization of volcanic rocks using empirical systems and data mining techniques

open access: yesJournal of Rock Mechanics and Geotechnical Engineering, 2018
This paper tries to characterize volcanic rocks through the development and application of an empirical geomechanical system. Geotechnical information was collected from the samples from several Atlantic Ocean islands including Madeira, Azores and ...
T. Miranda   +4 more
doaj   +1 more source

Application of X-ray Fluorescence Spectrometry and Electron Microprobe in the Identification of Intermediate-Felsic Volcanic Rocks

open access: yesYankuang ceshi, 2016
Intermediate-felsic volcanic rock has porphyritic texture and the matrix is characterized by microlitic, cryptocrystalline and vitreous textures. There will be errors when identifying and classifying the rocks using only a polarizing microscope because ...
XU Cui   +5 more
doaj   +1 more source

Relation of lineaments and volcano-stratigraphy of tertiary volcanic rocks in Kulon Progo Mountains Area, Yogyakarta-Indonesia

open access: yesE3S Web of Conferences, 2019
The structural lineaments developed in the Kulon Progo Mountains, which is mainly composed of Tertiary volcanic rocks. The direction and distribution of these lineaments density differs from one area to another.
Widagdo Asmoro   +2 more
doaj   +1 more source

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