Results 51 to 60 of about 4,124 (186)

Reconstruction of submarine eruption processes from FTIR volatile analysis of marine tephra: Example of Oomurodashi volcano, Japan

Frontiers in Earth Science, 2022
Tephra layers in marine sediments are widely used to correlate and date paleoclimate and paleoceanography records, and to determine spatiotemporal changes in magmatic evolution and eruption frequency.
Iona M. McIntosh, Kaori Aoki, Taiki Yanagishima, Makoto Kobayashi, Masanori Murata, Takehiko Suzuki   +5 more
doaj   +1 more source

Landslide Character and Hydrological Thresholds for Slope Failure Initiation on Volcanic Scoria Slopes: Case Study From Mt Hobson/Ōhinerau, Auckland, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
Rainfall‐induced landslides involving on Auckland Volcanic Field scoria cones are highly unusual, compared with widespread landsliding in the surrounding Auckland clay‐rich residual soils. Indeed, while Auckland can suffer from thousands of rainfall‐induced shallow landslides from severe storms at subdecadal timescales, these are usually limited to ...
Beatrice Bertelli, Martin Brook
wiley   +1 more source

Insights on Hydrothermal‐Magmatic Interactions and Eruptive Processes at Poás Volcano (Costa Rica) From High‐Frequency Gas Monitoring and Drone Measurements

Geophysical Research Letters, 2019
Identification of unambiguous signals of volcanic unrest is crucial in hazard assessment. Processes leading to phreatic and phreatomagmatic eruptions remain poorly understood, inhibiting effective eruption forecasting.
J. M. deMoor, J. Stix, G. Avard, C. Muller, E. Corrales, J. A. Diaz, A. Alan, J. Brenes, J. Pacheco, A. Aiuppa, T. P. Fischer   +10 more
doaj   +1 more source

Characteristics of Sub-Aerially Emplaced Pyroclasts in the Surtsey Eruption Deposits: Implications for Diverse Surtseyan Eruptive Styles

Geosciences, 2022
The 1963–1967 shallow-to-emergent eruption in Iceland’s Vestmannaeyjar earned a place in the history of volcanology by creating the island of Surtsey while under close observation of volcanologist Sigurdur Thorarinsson (Sigurður Þórarinsson in Icelandic).
Andrea Verolino, James D. L. White, Rachael J. M. Baxter, C. Ian Schipper, Thor Thordarson   +4 more
doaj   +1 more source

Phreatomagmatic deposits and stratigraphic reconstruction at Debunscha Maar (Mt Cameroon volcano) [PDF]

, 2010
The Debunscha Maar (DM) is located on the southwest flank of Mount Cameroon, an active stratovolcano on the Cameroon volcanic line (CVL). Here, we present the physical characteristics of the pyroclastic deposits at DM with the aim of deciphering tephra ...
Devey, Colin W., Ngwa, Caroline, Suh, C. E.   +2 more
core   +1 more source

Large‐Scale Submarine Sediment Waves at Macauley Caldera Volcano: In Situ Evidence of High‐Flux, Syn‐Eruptive Submarine Transport

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Two sediment cores were collected from a submarine sediment wave field on the flank of Macauley volcano. Combined with seismic reflection surveys and numerical modeling, we present an integrated model of the formation of large‐scale, eruption‐fed, submarine sediment waves. The sediment waves are large (>100 m high, 1.5 km wide, tens of km long)
Shannon E. Frey, Martin Jutzeler, Matthieu Cartigny, Rebecca J. Carey   +3 more
wiley   +1 more source

A basaltic phreatomagmatic eruptive centre at Acacia Bay, Taupo Volcanic Centre [PDF]

Journal of the Royal Society of New Zealand, 1985
Abstract Basaltic tuffs seen in shoreline exposures at Acacia Bay township on Lake Taupo are interpreted as the heavily eroded relicts of a phreatomagmatic tuff ring and its associated outlying deposits. The tuff ring consists largely of ejected pumiceous lake sediments, which incorporate 15–20 volume % of juvenile basalt whose residual heat has caused
C. J. N. Wilson, I. E. M. Smith
openaire   +1 more source

Magma Paths of the Karthala and La Grille Volcanoes (Grande Comore) Revisited: New Evidence From Geomorphology and Geochemistry

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Grande Comore, the westernmost island within the Madagascar Comoros Volcanic (MCV) chain, hosts two juxtaposed basaltic volcanoes, Karthala and La Grille, with contrasting lava geochemical signatures and eruption frequencies. Their formation and dynamics have been explained either by a mantle plume or, more recently, as part of a ...
François J. P. Lötter, Nicolas Villeneuve, Andrea Di Muro, Nils Lenhardt, Laurent Michon, Pascale Besson, Hamid Soulé   +6 more
wiley   +1 more source

Ground deformation after the 2015 phreatomagmatic eruption at Kuchino-Erabujima Volcano, Japan detected by InSAR time series analysis with ALOS-2 data

Earth, Planets and Space
The Kuchino-Erabujima Volcano has experienced multiple phreatomagmatic eruptions since 2015. Monitoring ground deformation at active volcanoes is essential for understanding magma supply systems and predicting volcanic activity.
Misa Ichimura, Kano Mikihara, Masayoshi Ishimoto, Tomokazu Kobayashi, Hiroshi Munekane   +4 more
doaj   +1 more source

Influence of particle aggregation on the tephra dispersal and sedimentation from the October 8, 2016, eruption of Aso volcano

Earth, Planets and Space, 2020
The phreatomagmatic eruption at Aso volcano on October 8, 2016, released PDC and fallout up to 320 km from the vent, providing an opportunity to study the dispersal and sedimentation of tephra bearing wet and dry aggregates.
Tomohiro Tsuji, Naoki Nishizaka, Kozo Ohnishi   +2 more
doaj   +1 more source