Showing papers in "Journal of Volcanology and Geothermal Research in 2018"

TL;DR: In this paper, the authors explore the consequences and implications of such a volatile phase for petrogenesis and the fluid dynamics of magma reservoirs, and discuss the accumulation of the exsolved volatile phase at the roof zones of crystal-rich reservoirs for the large gas emissions observed during explosive eruptions, and for the development of metal-rich porphyry deposits.

TL;DR: A review of the state of the art of the topic can be found in this paper, covering a range of scales and event types from individual rock falls to sector collapses, and future directions toward operational seismo-acoustic monitoring of surficial mass movements at volcanoes.

TL;DR: In this paper, the authors investigated the topographic and structural changes associated with six distinct steam-driven explosions by comparing close-range photogrammetric data obtained before and after these explosions.

TL;DR: In this article, a review explores different methods employed in studies of volcanic stratigraphy, examines four case studies that use differing stratigraphic approaches, and recommends methods for using systematic volcanic Stratigraphy based on the application of the concepts of traditional stratigraphys but adapted to the needs of volcanological environment.

TL;DR: In this article, the authors provide an up-to-date synthesis of knowledge and understanding of igneous rocks formed by hypervelocity impact, and conclude that distinguishing between an impact versus an endogenic origin for igneous-like rocks is a non-trivial task that ultimately may require sample investigation and analysis to be conducted.

TL;DR: In this paper, a meta-analysis was conducted to compare 44 seismic velocity models of the shallow structure of eleven volcanoes, laboratory velocity measurements on about one hundred rock samples from five volcanoes and seismic well-logs from deep boreholes at two volcanoes.

TL;DR: In this article, the spectral induced polarization measurements (complex conductivity) in the frequency band 10mHz-45mkHz of 85 core samples from five volcanoes: Merapi and Papandayan in Indonesia, Furnas in Portugal, Yellowstone in the USA (26 samples), and Whakaari (White Island) in New Zealand (22 samples).

TL;DR: In this paper, the authors integrated field observations and geochemical data on tephra deposits from the main Late Quaternary volcanic centres in the central Ethiopian Rift (MER) to assess contemporary volcanic hazards.

TL;DR: In this paper, the authors compare databases of global, satellite-detections of ground deformation (1992-2016), SO2 emissions (1978-2016, and thermal features (2000-2016) that together include 306 volcanoes.

TL;DR: In this paper, a tank filled with a crust analogue (gelatine, which is transparent and elastic) is injected from below by a magma analogue (dyed water), and a penny-shaped fluid-filled crack is formed, intruded and traverses the gelatine slab vertically to then erupt at the surface.

TL;DR: In this article, a large-scale inversion code named ECT-3D was developed to handle complex topographical effects like those encountered in volcanic areas, which can reconstruct the electrical conductivity field of an edifice marked by a strong topography and strong variations in the resistivity distribution.

TL;DR: In this article, the thermal and cold waters of the Golemezli Geothermal field in western Turkey have been analyzed and two groups of thermal waters have been distinguished: (i) Group 1A, comprising Na-SO4 type and Ca-SO 4 type and (ii) Group 2B, only consisting Ca-HCO3 type waters.

TL;DR: In this paper, the authors measured the velocity of scaled analogue particles over the range of flow conditions anticipated for volcanic ash dispersion to test published formulae against an independent dataset, using a semi-empirical formula determined to be accurate for non-spheres to investigate the sensitivity of the modelled transport of an ash cloud to particle shape.

TL;DR: In this article, the authors show that the microstructural elements that offer the shortest route through the sample, estimated to have an average radius ~0.1-0.5μm using the Klinkenberg slip factor, are accessible to gas, but restricted or inaccessible to water.

TL;DR: In this article, a global database of Quaternary maar crater planform morphometry is presented, showing that maar craters are typically not circular and frequently have compound shapes resembling overlapping circles.

TL;DR: In this article, the authors present the most comprehensive dataset for a shallow intrusion and its host rock in a volcanic setting to date, detailing the mechanical and physical properties of volcanic rocks from Pinnacle Ridge, Mt. Ruapehu, New Zealand.

TL;DR: In this paper, a discrete element method implemented in the modeling software Particle Flow Code is used to investigate the growth and stability of a growing lava dome and to test the stability of the dome under the following conditions: increased internal pressure, switch in extrusion direction caused by partial cooling of the lava dome; and extrusion of lava onto variable underlying topography.

TL;DR: In this paper, a detailed analysis of the spatial distribution of the thermal expressions, and their relationship to the tectonic framework was carried out using high-resolution UAV-based optical and radiometric infrared cameras.

TL;DR: In this article, a detailed account of the geological evolution of the Boset-Bericha Volcanic Complex (BBVC) is reported, with a focus on extensive young lava flows covering the two edifices, Gudda and Bericha.

TL;DR: The GEOTas mentioned in this paper project as mentioned in this paper measured several petrophysical properties to better understand how fluids flow in the hydrothermal system, provide a set of parameters to modelers and build datasets for future interpretation of well logs.

TL;DR: Harker et al. as discussed by the authors focused on spatio-temporal evolution of basaltic volcanism in the Central Anatolian post-collisional Quaternary region.

TL;DR: In this article, a morphometric study, mapping, relative dating, twenty-four new 40Ar/39Ar dates, and chemical analyses for the Sierra Chichinautzin, Central Mexico were performed.

TL;DR: In this article, a conceptual model for transport and deposition mechanisms of the July 2015 block-and-ash flow (BAF) events at Volcan de Colima is proposed, which highlights the importance of including and correctly assessing the hazards posed by large volume and long runout BAFs associated with frequent, small VEI, sustained dome collapse eruptions.

TL;DR: In this article, the authors measured and sampled surface manifestations of the geothermal system (geysers, perpetual spouters, mud pools/volcanoes, and non-eruptive hot springs) and meteoric water.

TL;DR: In this paper, a new, pre-Green Tuff (46 ka) volcanic stratigraphy is presented for the peralkaline Pantelleria Volcano, Italy, and the authors find that the pre-46 ka succession is characterised by eight silica-rich peralkalaline (trachyte to pantellerite) ignimbrites, many of which blanketed the entire island.

TL;DR: In this article, the authors used structure-from-motion (SfM) photogrammetric techniques to create digital elevation models (DEMs) of the active lava flow.

TL;DR: Combined zircon U-Th-Pb and (U-Th)/He dating was applied to refine the eruption chronology of the last 2.Myr for the andesitic and dacitic Pilisca volcano and Ciomadul Volcanic Dome Complex (CVDC), the youngest volcanic area of the Carpathian-Pannonian region, located in the southernmost Harghita, eastern central Europe as discussed by the authors.

TL;DR: In this article, the authors presented the first 3D high-resolution multichannel seismic dataset from a partially submerged caldera setting, the Campi Flegrei (CFc), and examined the spatial and temporal evolution of the CFc since the last calderal forming event, the Neapolitan Yellow Tuff (NYT, 15-ka) eruption.

TL;DR: Water-saturated hydrothermal alteration significantly lowers the resistivity and magnetization of volcanic rock and therefore hydrothermally altered rocks can be identified with helicopter electromagnetic and magnetic measurements as mentioned in this paper.

TL;DR: In this paper, the evolution through time of Tungurahua volcano (Ecuador) and its history was studied, and it was shown that the volcano is much younger than expected.