Please see below for sessions of interest to the GeoPRISMS Community, taking place at the 2018 AGU Fall Meeting, December 10-14 in Washington, DC. AGU abstract submission deadline is 1 August 2018, 11:59 P.M. EDT.
Submit your abstract: https://fallmeeting.agu.org/2018/abstract-submissions/
Your session is not listed? Email us at email@example.com and we’ll be happy to include your session to the list.
T017. Exploring Subduction Initiation Processes and Subduction Zone Dynamics: New Insights from Scientific Drilling, Marine Geophysics and Ophiolites
Conveners: Joann Stock, Brandon Shuck, Anders McCarthy, and Marco Maffione
Session Description: Fundamental processes controlling the genesis and recycling of the earth’s crust are linked to the dynamics of subduction initiation, and the evolution of mature subduction zones through time. Constraining such processes requires a combination of multidisciplinary studies, including ocean-drilling expeditions, seafloor geophysical and seismic exploration, field analyses of ophiolites preserved in mountain belts, and modeling. New data from these areas are advancing knowledge of the pre-existing structure of the plates, the initial stages of subduction initiation and arc inception and finally the development of mature subduction zones and mature arc settings. This interdisciplinary session solicits contributions from recent and past scientific drilling projects (IODP/ICDP), imaging structures and geophysical characteristics of oceanic lithosphere and nascent subduction zones, and recent advances in field, laboratory, and modeling studies constraining subduction processes from inception to arc development.
Invited Speakers: Michael Gurnis (Caltech) and Julie Tugend (ISTEP)
T032. Oceanic Lithosphere: Structure and Evolution from Creation to Destruction
We would like to encourage submission to the AGU 2018 session “Oceanic Lithosphere: Structure and Evolution from Creation to Destruction”, which may be of special interest to the GeoPRISMS community. The aim of this session is to explore what we know about the variability in oceanic crust and lithosphere both in space and over time using a range of geophysical, geochemical and geodynamic methods. Please see below for the full session description and information.
Adrian Doran, Jennifer Harding, and Zhitu Ma
Conveners: Adrian Doran (Scripps Institution of Oceanography), Jennifer Harding (University of Texas at Austin), Zhitu Ma (Brown University)
Session Description: The oceanic lithosphere, the rigid plate covering 70% of the Earth’s surface, controls a broad range of surface and deep-Earth processes, including heat flow and energy transfer at small and large scales. Our understanding of this region has been historically limited due to its vastness and the difficulty of data collection, but recent advances in analysis and instrumentation warrant examining new perspectives on the oceanic lithosphere. We invite new science focusing on the magnitude and wavelength of heterogeneity of oceanic lithosphere in space and time from a diverse range of disciplines, including but not limited to geodynamic modeling, petrology & mineralogy, seismology, and electromagnetic methods . We also encourage submissions pertaining to the accretion of oceanic crust at spreading centers, hotspots, continental margins, fracture zones, volcanoes, thermal properties, and subduction zones.
Invited Speakers: Jim Gaherty (LDEO), Maxim Ballmer (ETH Zurich)
T035. Seafloor Geodesy — Measuring Deformation of the Seabed
Conveners: Martin Heesemann, Ocean Networks Canada, Kelin Wang, Geological Survey of Canada, Yusaka Ohta, Tohoku University, Matthew Cook, Scripps Institution of Oceanography
Session Description: Seafloor geodetic methods allow for measuring crustal deformation over Earth’s vast areas that are covered by water, and therefore inaccessible to standard geodetic techniques. Over the last decade, remarkable technological progress has been made to increase the precision and scales of observations, while improving the reliability and cost effectiveness of the instrumentation. Unquestionably, seafloor geodetic measurements will continue to significantly advance our understanding of the motion and deformation of oceanic tectonic plates, earthquake processes in subduction zones, and the deformation of submarine volcanoes and spreading centers. Moreover, non-tectonic targets such as slope stability, underwater mass movements, extraction of hydrocarbons, and the sequestration of CO2 into the ocean floor can be monitored. We invite abstracts that highlight seafloor geodetic (e.g. GPS/A, differential bathymetry, seafloor pressure, acoustic ranging, seismometry, gravity, tilt, and strain) measurement systems, data processing methods, observational results, and modeling studies.
S008. Environmental seismology: using geophysical tools for Earth surface processes research
Conveners: Danica L Roth (University of Oregon), Aurélien Mordret (Massachusetts Institute of Technology), Bradley Paul Lipovsky (Harvard University), Michael Dietze, Deutsches GeoForschungsZentrum
Session Description: Recent work has highlighted the generation of elastic waves by processes at or near the Earth’s surface, and seismic techniques are being utilized to examine an increasingly diverse range of processes, hazards and materials. Seismic observations with high temporal resolution and broad spatial coverage of multiple sources and inaccessible environments. Areas of recent advancement include: mass movement (landslides, rockfalls, debris flows, lahars); hydrologic (groundwater, open water waves/tides, outburst floods, turbulence, sediment transport), cryospheric (avalanches, icequakes, calving, ice fracture/deformation, glacial hydrology/sliding), atmospheric and oceanic (microseisms, extreme weather, gravity waves) phenomena; use of large-N arrays; 4-d imaging of substrate, material, and structural attributes; and anthropogenic sources.
This session connects scientists applying theoretical, field-based and experimental seismic methods to Earth surface and near-surface dynamics. We invite contributions from geomorphology, cryospheric sciences, seismology, hazards, volcanology, soil sciences, rock mechanics, hydrology, and related fields.
Danica Roth, Aurélien Mordret, Bradley Lipovsky, and Micha Dietze
V011. Chemistry and Physics of Redox reactions in the Solid Earth
Conveners: Fred A Davis (University of Minnesota Duluth), Maryjo N Brounce (University of California Riverside)
Session Description: Earth boasts an enormous oxidation/reduction (redox) gradient from its oxidized surface to its reduced, metallic core. The variation in redox potential between, and laterally within, these layers has profound consequences for geochemistry, geophysics, and geobiology. Redox reactions between minerals, melts, and fluids affect stable assemblages in the crust, mantle, and core. Varying concentrations of redox-sensitive elements can change the rheological properties of minerals by influencing defect concentrations. And chemical exchange between the surface and the interior has led to the evolution of physically distinct reservoirs on geologic timescales. This session hopes to foster conversations among a broad range of disciplines, including both geochemistry and geophysics. We encourage submissions describing experimental, modeling, and natural sample studies in igneous and metamorphic petrology, geochemistry, mineral physics, and seismology.
V018. Deciphering Magma-Tectonic Interactions in Rifts, Arcs, Ridges and Volcanic Fields
Conveners: Christelle Wauthier (Pennsylvania State University), Pete La Femina (Pennsylvania State University), James Muirhead (Syracuse University) and Halldor Geirsson (University of Iceland)
Session Description: Magma-tectonic interactions occur at scales from individual magmatic systems to plate boundaries. Numerous studies reveal spatial and temporal relationships between magma intrusions, earthquakes, and volcanic eruptions. Field, geodetic, and modeling studies suggest tectonic earthquakes can trigger volcanic eruptions and intrusions through static and dynamic stress transfer. Conversely, magma transport and storage can generate earthquakes via stress changes in surrounding country rock. In rifting events, magmatic fluids can also help release tectonic stresses. Finally, the combined effects of magmatic, gravitational and tectonic stresses can trigger catastrophic volcanic flank collapse. This session will focus on the analysis and modeling of magma-tectonic interactions as broadly defined above. We particularly encourage multidisciplinary studies utilizing tools in geodesy, volcanology, geochemistry, structural geology, and seismology to decipher relationships between magmatic and tectonic processes. We also welcome studies using stress analysis and/or advanced numerical and analog modeling to understand the link between tectonic and magmatic systems.
We are looking forward to seeing you in Washington D.C!
Christelle Wauthier, Pete La Femina, James Muirhead and Halldor Geirsson
V026. Integrating perspectives on East African Rift magmatism from satellite to subsurface measurements
Conveners: Erin DiMaggio (Pennsylvania State University), Sara Mana (Salem State University), Wendy R Nelson (University of Houston), Christelle Wauthier (Pennsylvania State University)
Session Description: The East African Rift (EAR) System hosts hundreds of active and extinct volcanoes that formed prior to and in close association with continental rifting, offering an extraordinary opportunity to investigate volcanic and magmatic processes in an active rift at different stages of development. The rich history of Cenozoic magmatism in East Africa can be investigated at different scales, from magma generation in the deep Earth to the surficial expression of volcanism to satellite based studies. This session aims to highlight new and innovative research projects that bring together insights from geological, geochemical, and geophysical data sets into a unified framework that will further our understanding of EAR volcanism. We welcome contributions related to EAR magma generation, storage and transport, volatile fluxes and emissions, eruptive history, and volcano-tectonic interactions.
V027. Interdisciplinary Characterization of Volcanic Explosion Source Dynamics
Conveners: Kathleen McKee (firstname.lastname@example.org), Sarah Albert (email@example.com), Benjamin James Andrews (firstname.lastname@example.org), and Maurizio Ripepe (email@example.com)
We would like to bring your attention to the 2018 AGU Fall Meeting Session entitled, “Interdisciplinary Characterization of Volcanic Explosion Source Dynamics”. We invite contributions that explore this topic from a variety of perspectives. Please see below for more information.
Session Description: Forecasting the onset and hazards of volcanic eruptions requires an integrated understanding of precursory activity, source dynamics, and impact of erupted products. A quantitative understanding of explosion source dynamics and their associated geophysical observations is key to advancing understanding of more complex and hazardous volcanic eruptions. Volcanic eruptions range from discrete, impulsive, low-intensity explosions (strombolian) to large, sustained, plinian eruptions. Specific source dynamics vary by eruption style and location. Strombolian and Vulcanian explosions produce a variety of signals that can provide insight into specific source dynamics.
We encourage contributions investigating volcanic explosion source dynamics from various approaches such as physics-based modeling, analogue experiments, field observations, and theory. Analyses using geophysical instrumentation (seismic, infrasound, high-speed imagery, gas data, radar, deformation, etc.) are welcome. We also invite contributions using chemical explosions as a proxy for volcanoes.
V037. Sulfur – a unique player for redox evolution, volatile degassing, metal transport in magmatic, volcanic, and hydrothermal systems
Conveners: Xiaofei Pu (University of Michigan), Adrian Fiege (American Museum of Natural History), Tobias Fischer (University of New Mexico), Rita Economos (Southern Methodist University)
Session Description: Sulfur is a remarkable element that plays a major role in a range of volcanic, magmatic, and hydrothermal processes. The presence of sulfur affects the partitioning of various elements between mineral, melt, and volatile phases. The polyvalent and multi-speciation nature of sulfur in these phases makes it a unique proxy for redox processes, but adds significant challenges to sulfur-related research.
Sulfur contents and species in volcanic gasses provide critical information on volcanic activity assessment. In this regard, our understanding of the temporal evolution of volcanic gas signatures is largely dependent on experimental and thermodynamic modeling approaches, combined with field observations.
In this session we aim to facilitate dialogues between the computational, experimental and field-based volcanology, petrology, and economic geology communities, to better understand the role and behavior of sulfur and associated elements in magmatic, volcanic, and hydrothermal systems. Contributions based on interdisciplinary observations and novel analytical techniques are encouraged.
Invited speakers (confirmed): Marc-Antoine Longpré (Queens College, City University of New York – Tentative title: Sulfur systematics record the volatile-rich, oxidized, and recycled nature of the Canary Island mantle source), Echo (Shuo) Ding (American Museum of Natural History – Tentative title: sulfate solubilities and sulfur partitioning between andesitic-rhyolitic melt and C-O-H-S fluid)
V044. Volcano Seismology and Acoustics: Recent Advances in Understanding Volcanic Processes
Conveners: Alexandra Iezzi (Geophysical Institute, University of Alaska Fairbanks), Diana Roman (Carnegie Institution for Science Washington), Weston Thelen (USGS, Cascade Volcano Observatory), Benoit Taisne (Earth Observatory of Singapore)
Session Description: Volcanic eruptions may involve a variety of hazardous phenomena including ash plumes, gas emissions, explosions, pyroclastic flows, lava flows, and lahars. Mass wasting may also occur during periods of volcanic quiescence. All of these phenomena produce seismic and infrasound signals that may provide key real-time information on hazardous surface phenomena. We can also gain insights into volcanic hazards by tracking subsurface processes such as magma and hydrothermal fluid migration using volcano seismology.
Recent advances in analysis and interpretation of seismic and acoustic data facilitate a precise characterization and quantification of the physical processes leading to and producing hazardous volcanic phenomena. However, volcano seismology and acoustics remains an emerging area of research.
We welcome submissions that explore new seismic and acoustic observations, interpretations, models, instrumentation, or techniques that further our understanding of volcanic processes and potentially aid future monitoring efforts.
We look forward to seeing you in Washington D.C.,
Alex, Diana, Wes, and Benoit
MR023. Volatile Elements in Planetary Interiors: Storage, Cycling, and Implications
Conveners: Jin Liu (Stanford University), Jessica Warren, (University of Delaware), Elizabeth C. Thompson (Northwestern University), and Marc M. Hirschmann (University of Minnesota)
Session description: Volatile elements including hydrogen, carbon, nitrogen, oxygen, sulfur, and the halogen group elements play an important role in the dynamics, structure, and evolution of the Earth’s interior, and are believed to play a similarly important role in other terrestrial planets. The cycling of volatile elements between a planet’s surface and interior can be coupled to planetary-scale processes, and volatile elements within a planet’s interior can influence a wide range of properties including redox state, conductivity, rheology, viscosity, melting, and element partitioning. This session aims to unite researchers from the fields of geochemistry, petrology, mineral physics, rock mechanics, seismology, and geodynamics whose work addresses the role of volatile elements in planetary interiors, the stability and cycling of volatile element-bearing phases at extreme conditions, and the influence of volatile elements on geological processes within the Earth and other terrestrial bodies.
Invited Presenters: Oliver Tschauner (University of Nevada, Las Vegas) and Ananya Mallik (Brown University)
We look forward to seeing you in Washington, D.C.!
On behalf of the conveners,
Elizabeth ‘Lily’ Thompson
DI022. The Role of Lithosphere Heterogeneities in Shaping Plate Kinematics and Subduction Dynamics
Conveners: Roberta Carluccio (University of Melbourne), Lorenzo Colli (University of Houston), Jennifer M. Garrison (CalState – LA), Gideon Rosenbaum (University of Queensland)
Session description: The lithosphere constitutes the upper thermal boundary layer of mantle convection. It is well established that its properties exert a fundamental control on solid Earth dynamics by determining the tectonic regime. Moreover, the lithosphere provides a primary source of thermal and chemical anomalies for mantle convection when it is injected in the mantle as subducting slabs.
Some lithosphere heterogeneities include rheological stratifications, sutures, fracture zones and, lateral and vertical variations in temperature and composition. These exist at various scales and play a major role in determining subduction dynamics and the degree and style of lithosphere-mantle coupling processes.
This session aims to highlight recent advances in constraining the scales and amplitudes of heterogeneities in the lithosphere as well as their dynamic role. We welcome multidisciplinary contributions. Some key areas of interest are lithospheric structure and morphology, subduction kinematics and dynamics, slab-mantle interaction and slab deformation, active margin tectonics and subduction-induced seismicity.
Invited speakers: Sung-Joon Chang (Kangwon National University), Luca Dal Zilio (ETH Zurich)