Results 61 to 70 of about 865,890 (160)

High Potash Volcanic Rocks and Pyroclastic Deposits of Damavand Volcano, Iran, an Example of Intraplate Volcanism [PDF]

Journal of Sciences, Islamic Republic of Iran, 2017
Damavand is a fascinating dormant stratovolcano, 60 km to the ENE of Tehran located in the Alborz Mountains. Damavand volcanic products consist of lava flows and pyroclastic fall, flow and surge deposits from different eruption cycles. The volcanic rocks
M. Mortazavi
doaj  

Experiments on gas-fluidised granular flows and implications for pyroclastic flow mobility

, 2002
International audienceGranular flows were generated by the release of beds of particles in various fluidized states, which then deaerated in a horizontal channel. We describe characteristics of the flows and their deposits.
Sparks, RSJ, Roche, O, Gilbertson, M, Phillips, JC, Sparks, R, S J, Gilbertson, MA, Roche, Olivier, Phillips, J, C, Sparks, R,, Phillips, J,   +9 more
core   +1 more source

Pyroclastic Flow Deposits and InSAR: Analysis of Long-Term Subsidence at Augustine Volcano, Alaska

Remote Sensing, 2016
Deformation of pyroclastic flow deposits begins almost immediately after emplacement, and continues thereafter for months or years. This study analyzes the extent, volume, thickness, and variability in pyroclastic flow deposits (PFDs) on Augustine ...
David B. McAlpin, Franz J. Meyer, Wenyu Gong, James E. Beget, Peter W. Webley   +4 more
doaj   +1 more source

Late Pliocene–Quaternary Arc Volcanism at the Southern Limit of the Hikurangi Subduction Zone: Revised Chronology of the Taranaki Peninsula, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 4, December 2026.
Igneous centres across the Taranaki Peninsula represent the southwestern limit of arc volcanism associated with the Tonga–Kermadec–Hikurangi subduction system. Taranaki Maunga, the youngest and largest of three andesitic stratovolcanoes, dominates the geomorphology of the Taranaki Peninsula along with the eroded remnants of the Kaitake and Pouakai ...
G. P. Thrasher, M. W. Sagar, H. Seebeck, G. P. D. Viskovic   +3 more
wiley   +1 more source

Estimating Sub‐Pixel Temperatures During Volcanic Eruptions Using Dual‐Band Thermal Imaging Technique: Case Studies From Whakaari/White Island (New Zealand) and Tofua (Tonga)

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 4, December 2026.
This study presents the first application of a dual‐band satellite thermal monitoring technique in New Zealand and Tonga, using the 2019 eruption of Whakaari/White Island and the persistently active Lofia crater on Tofua volcano as case studies. At Whakaari/White Island, near‐synchronous Landsat‐8 and Sentinel‐2A data (16 min interval) were analysed ...
Salman Ashraf, Geoff Kilgour, Jenny Black, Muhammad Aufaristama   +3 more
wiley   +1 more source

Pyroclastic flows of the 1883 Krakatau eruption

, 1991
The nature of the submarine deposits produced by the 1883 Krakatau eruption in Indonesia has remained controversial for more than a century. Knowledge of their character, however, is critical to understanding the origin of the devastating tsunamis ...
Sutikno Bronto, Charles Mandeville, Sigurdsson, Haraldur, Carey, Steven, Mandeville, Charles, Steven Carey, Bronto, Sutikno, Haraldur Sigurdsson   +7 more
core   +1 more source

Building a Continental‐Scale Geodetic Network: The Plate Boundary Observatory (PBO)

Perspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract The Plate Boundary Observatory (PBO) transformed the use of geodesy in North America to study crustal deformation and plate boundary processes by establishing a continental‐scale, standardized, open‐access geodetic network. Built and operated by UNAVCO between 2003 and 2018 as part of the National Science Foundation (NSF)‐funded EarthScope ...
Emily E. Zawacki, Michael E. Jackson, Glen S. Mattioli, David J. Mencin, Karl Feaux, Donna J. Charlevoix   +5 more
wiley   +1 more source

Entrance of hot pyroclastic flows into the sea: Experimental observations

, 2003
The entrance of hot pyroclastic flows into water has been observed in a series of experiments in which shooting granular flows of hot ignimbrite ash (≤403 °C), of bulk density near that of water, run down a smooth chute and enter a water-filled tank at ...
Freundt, Armin
core   +1 more source

Quantifying Bulk Silica of Felsic and Mafic Lithologies on Mars

Geophysical Research Letters, Volume 53, Issue 22, 28 November 2026.
Abstract On Earth, silica‐rich volcanism is typically associated with convergent plate boundaries, yet Mars, a stagnant‐lid body, also hosts regions with silicic lithologies. Here, we introduce a novel approach to directly estimate bulk silica (SiO2 wt.%) using multispectral data and machine learning.
Nandita Kumari, Carlos Gary‐Bicas, Cheng Ye, A. Deanne Rogers, Timothy D. Glotch, John F. Mustard   +5 more
wiley   +1 more source

Deposits from dome-collapse and fountain-collapse pyroclastic flows at Soufriere Hills Volcano, Montserrat

, 2002
Pyroclastic flows were formed at Soufrière Hills Volcano by lava-dome collapse and by fountain collapse associated with Vulcanian explosions. Major episodes of dome collapse, lasting tens of minutes to a few hours, followed escalating patterns of ...
Cole, P. D., Calder, E. S., Young, S. R., Harford, C. L., Norton, G. E., Clarke, A. B., Sparks, R. S. J., Druitt, T. H., Herd, R. A.   +8 more
core   +1 more source