Results 41 to 50 of about 1,522 (205)

A Confidence-Based Assessment Method for Distinguishing Pyroclastic Density Current Deposits From Other Volcaniclastic Units

Frontiers in Earth Science, 2020
Pyroclastic density currents (PDCs) are a destructive volcanic hazard. Quantifying the types, frequency and magnitudes of PDC events is essential for effective risk management, but since historical records at best extend a few hundred years this usually ...
James Cowlyn, James Cowlyn, Ben M. Kennedy, Darren M. Gravley, Shane J. Cronin   +4 more
doaj   +1 more source

Interactions between pyroclastic density currents : insights from analog experiments [PDF]

, 2018
During some explosive volcanic eruptions, multiple pyroclastic density currents have been produced within a short time span of each other and flowed through the same area.
O'Donnell, Sean Bryan
core   +1 more source

Holocene record of large explosive eruptions from Chaitén and Michinmahuida Volcanoes, Chile

Andean Geology, 2013
Tephra fall deposits and one large ignimbrite close to Chaitén and Michinmahuida Volcanoes were analyzed for chemistry and radiocarbon dated to correlate the eruptive units and establish the timing of eruptions.
Álvaro Amigo, Luis E. Lara, Victoria C. Smith   +2 more
doaj   +1 more source

"Hot and sticky" and "cold and damp" pyroclastic eruptions, and their relationship with topography: valley- and lake-filling ignimbrites, Ardnamurchan, NW Scotland

Volcanica
Pyroclastic density currents are complex mixtures of rock, ash and gas and represent significant hazards at many active volcanoes worldwide. Ignimbrites are the deposits of pyroclastic density currents and can be used to record the eruption dynamics and ...
David Brown, Ailsa Quirie, Peter Reynolds, Simon Drake   +3 more
doaj   +1 more source

The footprint of column collapse regimes on pyroclastic flow temperatures and plume heights

Nature Communications, 2019
Pyroclastic density currents (PDCs) are a major threat during explosive volcanic eruptions, hence the possibility to forecast them would be a vital improvement for risk mitigation. Here the authors present a 3D flow model to quantify the thermal patterns
Matteo Trolese, Matteo Cerminara, Tomaso Esposti Ongaro, Guido Giordano   +3 more
doaj   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

The impact of volcanic eruption rate on pyroclastic hazard

Communications Earth & Environment
Pyroclastic density currents – fast flows of hot gases, ash, and debris – are some of the most hazardous phenomena associated with explosive volcanic eruptions.
Domenico M. Doronzo
doaj   +1 more source

Rock characteristics of post-caldera volcanoes in Dieng volcanic complex (DVC), Central Java, Indonesia

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2022
The Dieng volcanic complex (DVC) has one of the densest post-caldera volcanisms activity presents in Indonesia, yet its population density is considerably high.
Indranova Suhendro, Muhammad Nadafa Isnain, Rizky Wahyudi   +2 more
doaj   +1 more source

Identification and correlation of the Aso‐3 tephra in the Omaezaki area, central Japan: A valuable key stratum for the MIS 6/5 transition period

Journal of Quaternary Science, EarlyView.
ABSTRACT The Aso‐3 tephra is one of the most significant widespread marker layers from the Middle to Late Pleistocene, generated by a large caldera‐forming eruption at the Aso volcano in Kyushu, southwestern Japan. Despite its importance, a distal co‐ignimbrite ash correlative has yet to be clearly identified, primarily because although volcanic glass ...
Toshinori Sasaki, Takuya Morimoto, Tatsuyuki Ueno, Kazuo Mizoguchi, Norihisa Goto, Hisanori Ominami, Shohei Onaka   +6 more
wiley   +1 more source

Isolation, Insularity and Resilience: A Review of the Geophysical, Socioeconomic, and Environmental Vulnerabilities of Gran Canaria and Lesvos Islands for Policy Interventions to Global Change

Sustainable Development, EarlyView.
ABSTRACT The dynamic nature of small islands being geographically isolated and their perceived connectedness with global networks complicates research attempts to draw general conclusions on whether insularity leads to marginalization or strengthens their resilience for sustainable development.
Toheeb Lekan Jolaosho, Mazen Marouani, Takwa Boughanmi   +2 more
wiley   +1 more source