Please see below for more 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.
To access the full list, please visit the GeoPRISMS website at: http://geoprisms.org/meetings/agu-sessions/
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.
T026. Linking Tectonic Geomorphology and Plate Boundary Processes in Terrestrial and Marine Environments
Conveners: Jenna C Hill (USGS Pacific Coastal and Marine Science Center Santa Cruz), Janet Tilden Watt (USGS Pacific Coastal and Marine Science Center Santa Cruz), Daniel S Brothers (USGS Pacific Coastal and Marine Science Center Santa Cruz), Jared Kluesner (USGS Pacific Coastal and Marine Science Center Santa Cruz)
Session Description: Spatial variation in the crustal structure, kinematics, and seismogenic behavior of plate boundaries is often expressed in tectonic geomorphology and shallow structure both onshore and offshore. In this session, we aim to explore the relationship between surficial geomorphology, sediment dynamics and active tectonics to plate boundary processes, including studies that link upper plate processes to deeper crustal structure or hazards that are often associated with large earthquakes (e.g., landslides, tsunamis). We invite contributions from both marine and terrestrial environments, particularly those that employ new tools and advanced techniques for characterizing and quantifying spatial variability in deformation mode, rate, and recurrence. As it is particularly important to consider studies that span major geomorphic process domains (i.e. from the shoreline to the base of the slope), we encourage contributions from a wide range of geographic areas that employ a variety of methods to examine plate boundary processes and segmentation.
Invited Speakers: invited speakers include Dr. Olaf Zielke (KAUST) and Dr. Luca Malatesta (UCSC), with a range of expertise from earthquake seismology to coupled tectonic-surface processes and geomorphology.
T029. Multiscale imaging of plate boundary fault systems: integrating geophysical and geological data
Conveners: Valerie Sahakian (University of Oregon), Maureen Walton (USGS), Anne Tréhu (Oregon State University), Estelle Chaussard (SUNY Buffalo)
Session Description: In the half century since the advent of the plate tectonics paradigm, we have gained remarkable insights into the underlying physics of plate boundary systems from substantial increases in observational data and modeling results. Moving forward, the integration of these data is essential for a holistic view of tectonic processes and the natural hazards posed by plate boundaries. We hope to attract new research from different fields to emphasize the importance of multiscale data integration, including geophysical studies of seismicity, geodetic observations, source inversions, structural models, and numerical modeling, as well as geologic studies of surface processes, geochemical and laboratory analyses, and paleoseismic observations. We especially encourage multidisciplinary contributions that emphasize multiscale data integration, but also welcome focused studies of observations, methodologies, and/or modeling that aim to improve our understanding of plate boundary systems from the Earth’s surface through the lithosphere, and their relevance to natural hazards and society.
Invited speakers: Tim Wright (University of Leeds), Dan Bassett (GNS Science)
T031. Observations and models of multiphase deformation in rifts and rifted margins
Conveners: John Naliboff, Rebecca Bell, Scott Bennett, Jolante van Wijk
Session Description: Observations from rifts and rifted margins suggest continental extension commonly involves multiple phases of deformation with distinct structural, sedimentary and magmatic characteristics. In many rifts, deformation evolves both as a function of time and location, and rift architecture may reflect the influence of structural inheritance, evolution of the lithosphere’s thermal-mechanical profile, feedbacks between surface process and lithospheric deformation or large-scale changes in plate driving forces. Here, we solicit presentations that examine the long-term evolution of continental rift systems through field, geophysical and numerical investigations. In particular, we encourage submissions that focus on the processes driving changes in deformation style and use large 3-D observational or numerical data sets to characterize lithospheric deformation.
Invited Speakers: Donna Shillington (Columbia University), Robert Gawthorpe (University of Bergen)
T034. Puzzling Tectonics of the Gulf of Mexico: what do we know, what do we think we know, and what do we need to know?
Conveners: Irina Filina (firstname.lastname@example.org), Erin K Beutel (email@example.com), Patricia Persaud (firstname.lastname@example.org) and Robert J Stern (email@example.com)
Session Description: The tectonic history of the Gulf of Mexico is still being debated despite more than a century of petroleum exploration and an enormous amount of geophysical and geological data collected by industry. Tectonic models of the basin differ dramatically in key questions, such as the timing of opening, pre-breakup configuration of the crustal blocks and age of the seafloor. The proposed session intends to bring together researchers from different geoscience disciplines – geology, geophysics, geochemistry, tectonics, geodynamics – to discuss ways of improving our understanding of the basin. We welcome presentations on a broad range of topics – from addressing the continental break-up signature to those constraining sedimentation and hydrocarbon evolution. We also anticipate triggering active discussions on various aspects of Gulf of Mexico tectonics.
T041. Subduction Top to Bottom-2
Conveners: David William Scholl (University of Alaska Fairbanks), Gray E Bebout (Lehigh University), Laura M Wallace (University of Texas at Austin)
Session Description: From top-to-bottom, many geological, geophysical, petrologic, geochemical and theoretical advances have been made in understanding the subduction zone processes and dynamics explored in 1996 in AGU Geophysical Monograph 96, “Subduction Top to Bottom”. This session, and a related Themed Issue in the online journal GEOSPHERE, are intended to revisit the topics explored 22 years ago in Monograph 96—reassessing them in light of new advances and discoveries in subduction zone research. We invite the broadest possible thematic range of contributions, including subduction-related hazards (volcanic eruptions, earthquakes and tsunamis) and resources.
T042. Subduction zone processes at the Hikurangi margin, New Zealand
Conveners: Laura M Wallace (GNS Science, University of Texas Institute for Geophysics), Rebecca E Bell (Imperial College London), Kimihiro Mochizuki (University of Tokyo), Demian M Saffer (Pennsylvania State University)
Session Description: The Hikurangi subduction zone offshore New Zealandâs North Island exhibits pronounced along-strike changes in margin characteristics that make it an outstanding natural laboratory to investigate a wide range of fundamental subduction processes. This unique aspect of the subduction zone has sparked a plethora of new onshore and offshore geological and geophysical investigations. These experiments are helping to unravel the physical processes that control subduction plate boundary geodynamics and deformation. Recent efforts include scientific ocean drilling, multiple active and passive seismic experiments, seafloor geodetic deployments, and paleoseismic investigations. We welcome submissions that advance understanding of the Hikurangi subduction zone, including processes that underlie slow slip events and earthquake cycle behavior, volcanism and intra-arc rifting, volatile and fluid cycling, long-term subduction margin evolution, and geohazards associated with the plate boundary. Modeling studies, and comparative studies with other subduction zones to elucidate factors controlling subduction zone processes are also very welcome.
T043. Subduction Zone Processes, Orogenesis and Seismic Hazard: From the Alpine-Mediterranean to the Indo-Burma Region
Conveners: Patricia Persaud (Louisiana State University), Francesca Di Luccio (INGV, Rome), Claudia Piromallo (INGV, Rome), Michael S Steckler (LDEO, Columbia University)
Session Description: This session aims to promote stimulating discussions on subduction zones and orogens and the evaluation of seismic hazard in these regions. The Alpine-Himalayan belt is characterized by several spatially limited, complex, highly heterogeneous and constantly evolving subduction zones in the Mediterranean. To the east, the structure and dynamics of the Indo-Burma subduction zone is quite poorly known. Revealing the dynamics of subduction systems along the Alpine-Himalayan orogenic belt is relevant to seismic hazard research due to the high population densities of these regions. We encourage authors to present novel data and innovative research based on multidisciplinary approaches. Research areas may include seismic imaging, surface and mantle processes, laboratory experiments and geodynamic modeling. We particularly encourage submissions that range from local to global scales, addressing any aspect of subduction-related and orogenic processes and their implications in subduction zones worldwide.
Invited Speakers: Anne Replumaz (Université Grenoble-Alpes), Eric Sandvol (University of Missouri)
Submissions from early-career scientists are strongly encouraged.
T044. Synthesis: Knowns and Unknowns of the Cascadia Subduction Zone
Conveners: Helen Janiszewski (DTM, Carnegie Institution for Science), Wenyuan Fan (WHOI), Ikuko Wada (University of Minnesota), Caroline Seyler (McGill University)
Session Description: The Cascadia subduction zone is a global end-member warm-slab subduction zone and exhibits along-strike variations in subduction parameters (e.g., incoming plate age) and mechanical behavior (e.g., seismogenesis), serving as a unique natural laboratory to investigate a range of subduction zone processes, including tsunamigenic megathrust earthquakes, episodic tremor and slip, and arc volcanism. As these processes pose natural hazards, understanding their underlying causes is critical to natural hazard mitigation. The recent influx of offshore and onshore geophysical, geochemical, and geological data provides new opportunities to evaluate the entire Cascadia subduction zone in a coherent and consistent manner at various length and time scales. This session aims to synthesize recent findings and outstanding questions about this subduction system and the processes that occur within. We invite contributions from a wide range of disciplines, including (paleo)seismology, earthquake mechanics, geodesy, magnetotellurics, geochemistry, petrology, volcanology, structural geology, rock mechanics, and geodynamics.
Invited Speakers: Anne Pommier (UCSD), Amy Williamson (University of Oregon)
T051. The Varied Roles of Aqueous Fluids Near the Subduction Interface
Conveners: Cailey B. Condit (MIT), Besim Dragovic (Boise State), Jonathan R. Delph (Rice University), Melodie E. French (Rice University)
Session Description: Along the subduction plate interface, water influences the rheological and geophysical properties as well as the rates and products of metamorphic reactions. Recent geologic and seismic studies demonstrate that strong feedbacks exist between the fluid-mediated chemical and petrologic evolution of the rock, deformation processes that control fault slip behavior, and geophysical signals we use to interpret physical conditions at depth. Fluid distribution and flux are thought to vary with depth and the permeability structure near the plate interface. These fluids are proposed to control episodic tremor-and-slip, dehydration-induced seismicity, serpentinization of the mantle wedge, overriding plate alteration, and the 4-D evolution in interface bulk-rock compositions, active deformation mechanisms, and rock strength. We invite contributions addressing the varied influence of aqueous fluids near the subduction interface from across the Earth science community including, but not limited to: experimental studies, geodynamics, petrology/geochemistry, structural geology, and geophysics.
Invited speakers: Roland Burgmann (UC-Berkeley) and Emily Cooperdock (WHOI)
T054. Whose Fault Is It? Relating Structural and Compositional Heterogeneity to Slip Behavior
Conveners: Hannah Rabinowitz (Brown University), Helen Janiszewski (DTM), Samer Naif (LDEO), Ake Fagereng (Cardiff University)
Session Description: Large plate boundary fault systems are commonly rheologically segmented both along strike and down dip, including across the transition from seismic to aseismic shear displacement. In addition to thermal controls, these variations in slip style may arise due to geometric or compositional heterogeneities along the fault zone. Many questions remain on the relationships between structure and fault behavior. For example, how does rupture propagation interact with roughness or material properties along a fault at a range of slip rates? How does this impact the global variability in seismic behavior at plate boundaries? In this session, we will highlight recent advances in characterizing observed structures, geophysical properties, lithologies, and slip behaviors at plate boundary faults at a range of scales, with a focus on relationships between these features. We encourage submissions from seismology, magnetotellurics, geodesy, earthquake rupture modeling, structural geology, fault zone drilling, and experimental work.
Invited Speakers: Thomas Goebel, TBA
S032. The Role of Slow Slip Events in the Earthquake Cycle: Stressing, Triggering, and Hazard
Conveners: Bill Fry (GNS Science), Matt Gerstenberger (GNS Science-Institute of Geological and Nuclear Sciences Ltd), Yoshihiro Kaneko (GNS Science)
Session Description: Several recent great and large earthquakes have been correlated with slow slip events (SSE) on plate boundaries. Events in Japan, Chile, and New Zealand have preceded or triggered SSE. However, the physical interaction between fast and slow earthquakes is currenty poorly understood and many questions exist, including the relation of SSE to future large earthquakes. Understanding this interaction, either from a physical or statistical perspective, is crucial to explaining where and when future large earthquakes may occur.
Ongoing research aims to understand and model the occurrence of SSE. However, scant research specifically focuses on the role of SSE in triggering fast earthquakes. We invite contributions which investigate if and how SSE can trigger large earthquakes using such methods as physics based modeling (e.g., Rate and State Friction, seismicity simulators, stress modeling, etc.), empirical modeling or observations (e.g., ETAS, rate changes, etc.), paleoseismology or any study providing insight into this problem.
OS018. Geologic Evolution of Continental Shelves
Conveners: Shannon Klotsko (San Diego State University), Ashley McCleaf Long (Coastal Carolina University), Jillian Maloney, San Diego State University, Jenna Hill, USGS, Pacific Coastal and Marine Science Center
Session Description: The geologic evolution of continental shelves is linked to large-scale driving mechanisms including tectonics, climate, and sea level variations. On shorter timescales, processes that shape continental shelves include sediment dynamics associated with waves, tides and currents, as well as biologic activity and submarine groundwater discharge. These processes operate across various spatial and temporal scales, adding complexity to interpretations linking processes to morphology. Furthermore, continental shelves cycle between subaerial exposure and submergence associated with sea level fluctuations that repeatedly reshape the shelf and render the shoreline an artificial boundary in landscape evolution. We encourage submissions from onshore and offshore studies that investigate a broad range of topics including fluvial drainage history, sediment dynamics, paleoshorelines, drowned landscapes, shelf morphology and geologic framework controls on benthic habitats from both passive and active continental shelves worldwide. We welcome contributions from field observations including geophysical surveys, outcrop and core studies, landscape modeling, and laboratory experiments.
Invited speakers: Jennifer Miselis, USGS, #2 pending