Article
Geosciences, Multidisciplinary
D. Skye Kushner, Taryn M. M. Lopez, Kristi L. L. Wallace, David E. E. Damby, Christoph Kern, Cheryl E. E. Cameron
Summary: This study analyzes the mercury concentrations in 227 bulk ash samples from the Mount Spurr (1992), Redoubt Volcano (2009), and Augustine Volcano (2006) eruptions. The results show that there is no significant difference in mercury concentrations based on distance or discrete eruptive events, but there is a significant difference among different volcanic sources. It is also found that previous approaches to estimate volcanic total mercury emissions underestimate the mercury emitted in explosive events.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
E. Del Bello, J. Taddeucci, J. P. Merrison, K. R. Rasmussen, D. Andronico, T. Ricci, R. Scarlato, J. J. Iversen
Summary: Resuspension of volcanic ash by wind is hazardous and requires direct measurement of threshold friction velocity U-th*, which is strongly controlled by the median grain size and particle shape of the deposit.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Letter
Geosciences, Multidisciplinary
G. K. Gillmore, D. Wertheim, I. M. McIntosh, N. Petford, I. Gill
Summary: By using 3D imaging, we studied the volcanic glass particles from two Icelandic volcanoes and two experimental samples. True color 3D images were obtained, which allowed us to observe bubble structure, fracture patterns, and grain morphology characteristics. Laser confocal microscopy-based 3D imaging provides a fast and non-destructive way to assess the geometry and internal artifacts of volcanic glass particles.
Article
Environmental Sciences
Andres E. Bedoya-Velasquez, Manuela Hoyos-Restrepo, Africa Barreto, Rosa D. Garcia, Pedro Miguel Romero-Campos, Omaira Garcia, Ramon Ramos, Reijo Roininen, Carlos Toledano, Michael Sicard, Romain Ceolato
Summary: This study presents a synergistic approach to studying the aerosol optical and microphysical properties during the 2021 eruption of the Cumbre Vieja volcano in La Palma, Spain. The study aims to characterize the different phases of the volcanic eruption by analyzing the spatio-temporal evolution of the event and quantifying the mass concentration in four atmospheric layers. The impact of the volcanic plume reaching the South of France is also analyzed.
Article
Meteorology & Atmospheric Sciences
Nicholas Rainville, Scott Palo, Kristine M. Larson
Summary: Monitoring volcanic plumes through GPS signals involves understanding the physical processes and conditions that affect signal strength, in order to improve detection accuracy.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Environmental Sciences
Michael Sicard, Carmen Cordoba-Jabonero, Africa Barreto, Ellsworth J. Welton, Cristina Gil-Diaz, Clara Carvajal-Perez, Adolfo Comeron, Omaira Garcia, Rosa Garcia, Maria-Angeles Lopez-Cayuela, Constantino Munoz-Porcar, Natalia Prats, Ramon Ramos, Alejandro Rodriguez-Gomez, Carlos Toledano, Carlos Torres
Summary: The paper discusses the aerosol measurements taken during the volcanic eruption of Cumbre Vieja in La Palma Island, showing that the height of the volcanic plume varied significantly and steadily increased after the eruption started. The ash mass concentration was evaluated using a polarized lidar instrument, with the highest estimated concentration reaching 800-3200μg m(-3).
Article
Geochemistry & Geophysics
Alexandros P. Poulidis, Sebastien Biass, Gholamhossein Bagheri, Tetsuya Takemi, Masato Iguchi
Summary: This study addresses the underestimation of atmospheric vertical velocity in volcanic ash transport and deposition modeling, highlighting the importance of considering w for capturing complex trajectories of ash particles during low-altitude volcanic eruptions. The impact of w is most significant within 10 km from the vent, but the forced sedimentation of low terminal velocity particles can also have a significant secondary effect at larger distances.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Review
Geochemistry & Geophysics
Gabrielle Tepp, Robert P. Dziak
Summary: Many submarine eruptions have been recorded through seismo-acoustic signals since 1939, providing valuable information about the activity of hidden underwater volcanoes. Real-time monitoring and study of submarine eruptions have increased our understanding of deep-sea volcanoes, but there are still many questions that need to be addressed in order to fully understand and monitor submarine volcanoes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Environmental Sciences
Flavia Ruggieri, Giovanni Forte, Beatrice Bocca, Barbara Casentini, Anna Bruna Petrangeli, Anastasio Salatino, Domingo Gimeno
Summary: This study assesses the potential impacts of volcanic ash from the 2021 Tajogaite eruption on human health. The findings suggest that fluoride concentration in the ash may pose a potential health risk for water supply and children's drinking water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Zhixuan Cao, Marcus Bursik, Qingyuan Yang, Abani Patra
Summary: The study introduces the use of a three-dimensional volcanic plume model to represent the ash cloud source, improving predictive skill. Application of the model to the Pinatubo eruption reveals the significant impact of initial particle distribution on long-range ash cloud transport. Comparison with satellite data shows that the 3D model-based distribution of ash particles produces improved VATD simulations.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
Pierre Delmelle, Elena C. Maters, Julie A. Calkins, Francois Gaspard, Sophie Opfergelt, Susanna F. Jenkins
Summary: The presence of fluoride-bearing compounds in volcanic ash poses significant environmental and health hazards. Research suggests the existence of silicon hexafluoride salts, particularly Na2SiF6, in magmatic ash, which affects the F- concentration, acidity, and dissolved silicon isotope values. This highlights the important role of Na2SiF6 in modulating the environmental and health effects of ash emissions from fluorine-rich magmatic eruptions.
Article
Geosciences, Multidisciplinary
Masato Iguchi, Taishi Yamada, Takeshi Tameguri
Summary: This study investigates the characteristics of eruptive and non-eruptive deflation events at Sakurajima volcano, categorizes them based on seismic data, infrasound, and visual phenomena, and clarifies their occurrence characteristics in relation to pressure source volume changes. The results show that non-eruptive deflation events primarily emit volcanic gas and contribute less to volcanic ash mass eruption amounts compared to Vulcanian events. The activity of non-eruptive deflation events is helpful for understanding long-term variations in eruptive activity.
FRONTIERS IN EARTH SCIENCE
(2022)
Review
Environmental Sciences
K. M. Bisson, S. Gasso, N. Mahowald, S. Wagner, B. Koffman, S. A. Carn, S. Deutsch, E. Gazel, S. Kramer, N. Krotkov, C. Mitchell, M. E. Pritchard, K. Stamieszkin, C. Wilson
Summary: Volcanic eruptions have significant impacts on inhabited coastal environments and also contribute to climate and biogeochemical cycles. Current research on volcanic ash in the ocean primarily focuses on its effect on phytoplankton, particularly chlorophyll-a concentration. However, many fundamental questions regarding how volcanic ash deposition affects phytoplankton growth and community composition remain unanswered. This study proposes a multidisciplinary approach to monitoring volcanic eruptions near ocean ecosystems using satellite technology, with a focus on ash characteristics and geochemistry in seawater. The ultimate goal is to gain a better understanding of the impacts of volcanic eruptions on marine ecosystems and address societal concerns beyond chlorophyll-a measurements.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Materials Science, Ceramics
Zi-wei Zhou, Yue Zhao, Yu-xia Lin, Hui-ling Zheng, Wan-lun Ren, Song Chen
Summary: In this study, a green ceramic composite was successfully prepared using waste soda-lime glass as a binder and natural volcanic ash as a ceramic raw material. By adding alkaline-earth metal ions and B2O3, the dielectric properties of the glass and composites were improved. The addition of 2.5 wt% Ba2+ resulted in the environmentally friendly LTCC composites with good physical properties.
CERAMICS INTERNATIONAL
(2023)
Article
Geography, Physical
Gill Plunkett, Michael Sigl, Joseph R. McConnell, Jonathan R. Pilcher, Nathan J. Chellman
Summary: Polar ice cores provide important records of past volcanic eruptions and their impacts on climate and society. The co-deposition of volcanic ash in the ice helps determine eruption source parameters and provides insights into eruption characteristics. The review highlights the extensive source region of tephra reaching Greenland and identifies the relationship between eruption characteristics and climate responses.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Franziska Keller, Olivier Bachmann, Nobuo Geshi, Ayumu Miyakawa
Summary: The Aso-4 caldera-forming event is the second largest volcanic eruption Earth experienced in the past 100 ka, resulting in ignimbrite sheets with clear compositional, mineralogical, and thermal gradients. These gradients are primarily attributed to extensive magma mixing of two compositionally distinct magmas in a complex upper crustal reservoir rather than solely magma mixing.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Takahiro Miwa, Nobuo Geshi, Jun'ichi Itoh, Toshikazu Tanada, Masato Iguchi
Summary: The development of the VOLCAT instrument allows for automatic onsite microphotograph imaging of ash particles, providing a rapid characterization and evaluation of eruption style during ongoing volcanic activity.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Nobuo Geshi, Teruki Oikawa, Derek J. Weller, Chris E. Conway
Summary: This study investigates the evolution of the magmatic system of Miyakejima volcano in Japan between two major eruptions, providing new insights into the long-term activity and eruption potential of the volcano. The analysis reveals three distinct magmatic periods based on cyclic whole-rock compositional trends, with each period characterized by different types of eruptions and magma mixing processes. These findings suggest two main eruption scenarios for basaltic magma systems at Miyakejima and similar mafic volcanoes in the northern Izu-Bonin arc.
EARTH PLANETS AND SPACE
(2022)
Article
Geosciences, Multidisciplinary
Yusuke Minami, Keiko Matsumoto, Nobuo Geshi, Hiroshi Shinohara
Summary: The eruption activity of Kuchinoerabujima Volcano in Japan from 2018 to 2019 changed from continuous ash-laden plumes to intermittent explosive activity accompanied by pyroclastic density currents. The proportion of fresh volcanic rocks decreased and sulfate minerals derived from sulfuric acid fluid increased as the eruption progressed. The transition from magmatic activity to phreatomagmatic activity suggests a recharge of hydrothermal fluid, which may control future eruption scenarios at similar active volcanoes.
EARTH PLANETS AND SPACE
(2022)
Article
Geosciences, Multidisciplinary
Pietro Gabellini, Raffaello Cioni, Nobuo Geshi, Marco Pistolesi, Takahiro Miwa, Giorgio Lacanna, Maurizio Ripepe
Summary: Quantitative morpho-textural analysis of volcanic ash during an eruptive sequence at Sakurajima volcano in Japan provides important information on the eruptive dynamics and control mechanisms, contributing to a better understanding of low-to-mid intensity, ash-dominated explosive activities.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geochemistry & Geophysics
Kei Shimizu, Alberto E. Saal, Erik H. Hauri, John M. Sinton, Philip E. Janney, Nobuo Geshi, Roger Hekinian
Summary: The CO2/Ba ratio of the Pacific E-MORB mantle source in the southern East Pacific Rise is estimated to be 177, indicating a CO2 content of approximately 391 ppm. This high CO2/Ba ratio may be attributed to fractionation during an earlier melting event or the recycling of oceanic lithosphere or enriched continental lithospheric mantle into the convecting mantle.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Ayumu Nishihara, Nobuo Geshi, Hideto Naruo
Summary: Stratigraphic analysis of fallout tephra deposits provides insights into the long-term temporal change in the activities of Sakurajima volcano. The study reveals the eruption stages and shifts in volcanic centers, as well as changes in eruption styles and magma discharge rates. The combined analysis of distribution, stratigraphy, and age of pumice fall layers and volcanic deposits is a powerful tool for understanding the growth history of stratovolcanoes.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Chris E. Conway, Kenichiro Tani, Takashi Sano, Keiko Matsumoto, Osamu Ishizuka
Summary: Many Quaternary stratovolcanoes have hosted glaciers, and the interaction between lava flows and ice has impacted the growth histories of these volcanoes and provided insights into Earth's climate evolution. We have created a basic experiment using common kitchen ingredients to simulate lava-ice interaction on stratovolcanoes. This experiment can be used for geoscience outreach demonstrations and field identification of ice-bounded lava flows.
FRONTIERS IN EARTH SCIENCE
(2023)
Editorial Material
Geosciences, Multidisciplinary
Alexandru Szakacs, Karoly Nemeth, Nobuo Geshi, Gianluca Groppelli, Walter Baez
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Takahiro Miwa, Hidemi Ishibashi, Ryunosuke Kazahaya, Satoshi Okumura, Masato Iguchi, Genji Saito, Atsushi Yasuda, Nobuo Geshi, Hiroyuki Kagi
Summary: This study quantified the redox state of magma in volcanic glass particles to gain insights into its degassing process. The results showed that the redox state of magma in the glass particles was more reduced than that of volcanic gas, indicating a deeper location of the magma head during the open-vent degassing phase.
BULLETIN OF VOLCANOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Agust Gudmundsson, Kyriaki Drymoni, John Browning, Valerio Acocella, Falk Amelung, Fabio L. Bonali, Abdelsalam Elshaafi, Ines Galindo, Nobuo Geshi, Adelina Geyer, Michael J. Heap, Ozgur Karaoglu, Shigekazu Kusumoto, Joan Marti, Virginie Pinel, Alessandro Tibaldi, Thorvaldur Thordarson, Thomas R. Walter
Summary: Volcanotectonics combines techniques, data, and ideas from multiple disciplines to study the physical processes within volcanoes and improve the accuracy of volcano behavior and eruption forecasting.
BULLETIN OF VOLCANOLOGY
(2022)
Article
Environmental Sciences
Nobuo Geshi, Tadashi Yamasaki, Isoji Miyagi, Chris E. Conway
Summary: The study reveals the decompression of magma chamber during the caldera-forming eruption of Aira volcano in Japan 30,000 years ago, challenging previous theoretical models and proposing explanations for the catastrophic consequences caused by this decompression.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)