The first association in the parenthesis is leading the joint symposium

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The full IUGG 2019 searchable scientific program is now online

JV01 - Advances in Volcano Seismology and Acoustics in a Multi-Disciplinary Context (IAVCEI, IASPEI)


Convener: Jürgen Neuberg (UK, IAVCEI/IASPEI)

Co-Conveners: Jeff Johnson (USA, IAVCEI), David Fee (USA, IASPEI), Läslo Evers (Netherlands, IASPEI)



Volcano seismology requires often special consideration due to the fact that the source mechanisms as well as wave propagation effects are significantly different from conventional tectonic earthquakes. Particularly for open volcanic systems, acoustic monitoring provides additional information and constraints regarding magmatic processes. Hence, seismic and acoustic monitoring of active and dormant volcanoes remains the key element of any monitoring program undertaken by volcano observatories or research institutions.

Major advances have been made in the last years allowing us to identify several categories of seismic and acoustic events, and interpret them in terms of different magmatic or tectonic processes encountered on a volcano. Attempts based on multi-disciplinary methodologies turned out to be particularly successful.

This symposium is dedicated to latest developments in volcano seismic and acoustic monitoring techniques, as well as the interpretation and modelling methodology in a wider volcanological context.

We invite contributions for both oral and poster presentations that deal with any aspects relevant to seismic or acoustic monitoring, new methodologies as well as case studies from a variety of volcanic settings. This includes advances in instrumentation, as well as theoretical approaches. Particularly welcome are studies that combine seismic and acoustic monitoring and modelling techniques with other disciplines such as ground deformation, gas monitoring, petrology and fluid dynamics of magmatic systems.

JV02 - Petrological Reactions Forced by Transport and Deformation (IAVCEI, IASPEI)


Convener: Yan Lavallee (UK, IAVCEI)

Co-Conveners: Michael Manga (USA, IAVCEI/IASPEI), Jiuhua Chen (USA, IASPEI)



An increasing body of work is demonstrating that geochemical exchanges and petrological reactions may be strongly influenced by differential stresses and the resultant strain. In these systems a range of controlling processes and factors have been invoked or constrained, ranging from pressure solution, anisotropic diffusion, advection, shear heating, strain of the material micro- and macro- structure, and cage jumps (in colloids). Sharing these observations and interpretations between the different sub-disciplines of geoscience will help advance the next-generation petrological, mechanical and rheological models. In this symposium, we invite observational, experimental and modelling contributions in petrology, rheology, and rock physics that explore the nature of these anisotropic physico-chemical processes in relation to rocks, magmas, glasses and single-phase crystals. The discussions should aim to shed light on the implications for geological processes such as volcanic eruptions, diagenesis, metamorphic reactions, and engineering applications

JV03 - Strain Localisation and Seismic Hazards (IAVCEI, IASPEI, IAG)


Convener: Lori Kennedy (Canada, IAVCEI/IASPEI)

Co-Conveners: Boris Kaus (Germany, IAVCEI/IASPEI), Jeff Freymueller (USA, IAG/IAVCEI)



Tectonic deformation is often distributed across very broad plate boundary zones, especially in continental crust. However, within these broad zones there are almost always regions of significant strain localization, such that major fault systems accommodate the majority of the total plate motion. Strain localization can be controlled by pre-existing lithospheric weaknesses, plate boundary geometry and applied forces, thermal weakening through volcanism, or a combination of factors. The extent to which strain is localised or distributed has important impacts on long-term tectonics, and on the spatial distribution of earthquake hazards. At depth, the extent of strain localization within the mantle may have important impacts on the earthquake cycle. This session will combine observational, experimental, and theoretical studies using a variety of techniques to address the mechanical properties of the lithosphere and asthenosphere within plate boundary zones, and the processes that relate to localization of strain within the crust and mantle.

JV04 - Advances in Terrestrial Heat Flow Measurement and Interpretation (IAVCEI, IASPEI)


Convener: Shaopeng Huang (China/USA, IAVCEI/IASPEI)

Co-Conveners: Massimo Verdoya (Italy, IASPEI), Jacek Majorowicz (Canada, IASPEI), Guangzheng Jiang (China, IASPEI)



Terrestrial heat flow is a measure of the thermal energy flux from the interior of the Earth. This parameter provides fundamental information on the Earth’s energy budget, subsurface thermal structure, lithosphere thermo-tectonic history and bulk chemical composition (especially concerning the radiogenic heat-producing elements of the crust). Moreover, analyses of heat flow data are essential to evaluate the potential of geothermal energy and to reconstruct paleoclimate change on regional and global scales. Heat flow data are conventionally determined from the combination of geothermal gradient, obtained from underground temperature logs, and rock thermal conductivity measurements, often derived from laboratory experiments. High-quality heat flow measurements require appropriate raw data reduction, because both geothermal gradient and thermal conductivity are subject to site-specific perturbations associated with geological, geographical, hydrological, and even climatic settings. The major objective of this symposium is to provide a forum for discussions on all aspects related to the terrestrial heat-flow measurements and interpretation. We welcome contributions that describe results in theoretical and/or experimental works, as well as on the use of heat flow and underground thermal data for the exploration of geothermal energy.

JV05 - Recent Advances in Subaqueous Volcanism Derived from Ancient and Modern Volcanic Successions, Laboratory and Numerical Approaches (IAVCEI, IAPSO)


Convener: James White (New Zealand, IAVCEI)

Co-Conveners: Karin Orth (Australia, IAVCEI), Adam Soule (USA, IAVCEI), Evi Nomikou (Greece, IAVCEI), Steffen Kutterolf (Germany, IAVCEI), Rebecca Carey (Australia, IAVCEI), Chris German (USA, IAPSO)



Seventy percent of Earth’s volcanoes are hidden beneath the surface of the oceans. Although largely ‘invisible’, submarine volcanoes are responsible for >75% of Earth’s magma output, and the eruptions put gas, heat, and volcanic material into the hydrosphere and atmosphere as well as greatly influence biogeochemical processes.

This symposium will include presentations of both terrestrial ancient marine volcanic environments modern-day submarine volcanic systems, with the aim of enabling cross-fertilization of ideas. We call for abstracts for field, laboratory and numerical studies of submarine volcanism. We also call for abstracts that combine innovative and emerging technologies that enable breakthrough developments for advancement of knowledge in submarine volcanism.

JV06 - Tephra Hazard Modelling for Operational Use: Challenges, Successes and New Frontiers (IAVCEI, IAMAS)


Convener: Sara Barsotti (Iceland, IAVCEI)

Co-Conveners: Antonio Costa (Italy, IAVCEI), Andrew Tupper (Australia, IAMAS)



During volcanic eruptions tephra affect the surrounding environment by impacting the ground by pyroclasts fallout and the atmosphere by advected volcanic ash clouds. Our society, economy, environment is always exposed to discomforts and disruptions when similar events occur and assessing hazards associated to explosive eruptions is a crucial goal for the volcanological community. Simulating the dynamics of volcanic processes (from the magma migration to the explosion in the atmosphere) is now a well-established approach to investigate the phenomena and anticipate their possible evolution in time and space. Tephra hazard modelling is nowadays a viable tool to forecast in real-time those areas affected by contamination of ash in the atmosphere and on the ground. The aviation sector benefits significantly from these numerical tools as well as all that part of the population living nearby erupting volcanoes. However in time of crises is challenging to produce reliable forecast of an event for which estimates of the eruptive source parameters (like mass flow rate, total grain size distribution, plume height) are still unavailable or possibly affected by large uncertainty. The data assimilation process is an essential part of the operational response to constrain the ongoing scenario and adding credibility to the model results. At the same time assessing and communicating uncertainties associated with the measurements, observations and model results is fundamental when numerical products are provided to decision-makers and other stakeholders.

Operational tools need to be robust, fast, accurate and flexible. Large part of the research in the recent years have been investigating on how to improve the operational response by implementing new tool developed in more academic environments. In this symposium we welcome all contributions addressing those steps moved toward bridging science and operations within the tephra numerical modelling sector. Examples from experiences are kindly invited. Goals achieved and open questions will be essential for a fruitful discussion.

JV07 - Glaciovolcanism as a Paleoclimate Proxy (IAVCEI, IACS)


Convener: Ben Edwards (USA, IAVCEI)

Co-Conveners: Kelly Russell (Canada, IAVCEI)



This symposium invites contributions that focus on methods for and examples of extracting paleoclimate records from volcanic sequences formed by interactions with ice on planets. Increasingly scientists who model past climates on Earth and on Mars need data to test their models for the timing, extent and thickness of now-extinct bodies of ice. Deposits formed during interactions between volcanoes and glaciers are one of the few records that can document the exact location of past glaciers, are generally amenable to geochronologic studies, and are relatively resist to erosion by subsequent processes. While the study of glaciovolcanic deposits has been ongoing for several decades, new studies are increasingly extracting more detail information about past ice extents and even paleohydrology. We invite contributions from field and laboratory studies whose foci are extraction of paleoenvironmental data from glaciovolcanic deposits.

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IUGG 2019 Conference Secretariat JPdL International

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