Results 1 to 10 of about 319 (112)

Reconciling Pyroclastic Flow and Surge: The Multiphase Physics of Pyroclastic Density Currents [PDF]

Earth and Planetary Science Letters, 2002
Two end-member types of pyroclastic density current are commonly recognized: pyroclastic surges are dilute currents in which particles are carried in turbulent suspension and pyroclastic flows are highly concentrated flows. We provide scaling relations that unify these end-members and derive a segregation mechanism into basal concentrated flow and ...
George Bergantz, Alain Burgisser
exaly   +3 more sources

Analysis of the Pyroclastic Flow Deposits of Mount Sinabung and Merapi Using Landsat Imagery and the Artificial Neural Networks Approach

Applied Sciences, 2017
Volcanic eruptions cause pyroclastic flows, which can destroy plantations and settlements. We used image data from Landsat 7 Bands 7, 4 and 2 and Landsat 8 Bands 7, 5 and 3 to observe and analyze the distribution of pyroclastic flow deposits for two ...
Prima Riza Kadavi, Won-Jin Lee, Chang-Wook Lee   +2 more
doaj   +3 more sources

Topographical Controls on Small-Volume Pyroclastic Flows

Sedimentology, 2019
Abstract Emplacement of small‐volume (<0·1 km 3 ) pyroclastic flows is significantly influenced by topography. The Arico ignimbrite on Tenerife (Canary Islands) is a characteristic small‐volume pyroclastic flow deposit emplaced on high relief topography.
Domenico M Doronzo, Dario Pedrazzi, Joan Martí   +2 more
exaly   +3 more sources

Subaqueous volcanic eruptive facies, facies model and its reservoir significance in a continental lacustrine basin: A case from the Cretaceous in Chaganhua area of southern Songliao Basin, NE China

Petroleum Exploration and Development, 2023
The conventional lithofacies and facies model of subaerial and marine pyroclastic rocks cannot reflect the characteristics of subaqueous volcanic edifice in lacustrine basins.
Xuanlong SHAN, Hansheng MU, Yuhu LIU, Ruilei LI, Jianfeng ZHU, Yunqian SHI, Qinglei LENG, Jian YI   +7 more
doaj   +1 more source

Physical properties of pyroclastic density currents: relevance, challenges and future directions

Frontiers in Earth Science, 2023
Pyroclastic density currents (PDCs) are hazardous and destructive phenomena that pose a significant threat to communities living in the proximity of active volcanoes.
Thomas J. Jones, Frances Beckett, Benjamin Bernard, Eric C. P. Breard, Eric C. P. Breard, Fabio Dioguardi, Fabio Dioguardi, Josef Dufek, Samantha Engwell, Julia Eychenne, Julia Eychenne   +10 more
doaj   +1 more source

Development characteristics and petroleum geological significance of Permian pyroclastic flow volcanic rocks in Western Sichuan Basin, SW China

Petroleum Exploration and Development, 2022
By examining field outcrops, drilling cores and seismic data, it is concluded that the Middle and Late Permian “Emeishan basalts” in Western Sichuan Basin were developed in two large eruption cycles, and the two sets of igneous rocks are in unconformable
Hao PENG, Cheng YIN, Qinglin HE, Guoyong XIA, Yong LIU, Tinghu MA, Kang CHEN, Ran LIU, Wang SU   +8 more
doaj   +1 more source

ANCAMAN ERUPSI KAWAH IJEN TERHADAP MASYARAKAT LERENG IJEN (KABUPATEN BONDOWOSO)

ASANKA, 2020
Ijen caldera complex is a volcano that has a 7 km diameter elliptical caldera which only leaving a northern caldera wall curving towards the southward.
Dhimas Bagus Virgiawan
doaj   +1 more source

A Unifying Model for Pyroclastic Surge Genesis and Pyroclastic Flow Fluidization

Geophysical Research Letters, 2022
AbstractPyroclastic density currents (PDCs) are hot and fast ground‐hugging mixtures of volcanic fragments and gases, which represent a major threat to people living near explosive volcanoes. Mechanisms causing the separation into the concentrated (the pyroclastic flow) and dilute (the pyroclastic surge) layers, as well as the mechanism causing their ...
Kelfoun, Karim, Gueugneau, Valentin
openaire   +2 more sources

Forensic Profiling Analogue Approach for the Investigation of Natural Hazards – A Case Study from Onokoba Elementary School, Unzen Volcano, Japan

Forum Geografi, 2021
Internal temperature variations of pyroclastic flows and their deposits are arguably the most challenging data to acquire. As a preliminary study of the temperature variation inside pyroclastic flows, the remains of Onokoba Elementary School (Shimabara ...
Balázs Bradák, Christopher Gomez, Yoshinori Shinohara, Norifumi Hotta   +3 more
doaj   +1 more source

IMEX_SfloW2D 1.0: a depth-averaged numerical flow model for pyroclastic avalanches [PDF]

Geoscientific Model Development, 2019
Pyroclastic avalanches are a type of granular flow generated at active volcanoes by different mechanisms, including the collapse of steep pyroclastic deposits (e.g., scoria and ash cones), fountaining during moderately explosive eruptions, and crumbling ...
M. de' Michieli Vitturi, T. Esposti Ongaro, G. Lari, A. Aravena   +3 more
doaj   +1 more source