Author: GeoPRISMS

In the week of May 18-22, 2015, we will host a 5-day training workshop at the University of Texas in Austin for students and early-career scientists who want to gain experience with the analysis of active-source seismic refraction data. Participants in this workshop will learn how to identify seismic phases, pick arrival times, and invert for crustal seismic velocity structure along geophysical transects. Hands-on learning will be accompanied by lectures explaining the basic assumptions and geophysical theory behind the seismic refraction methods.

In the workshop we will use ocean-bottom seismic refraction data, as well as onshore-offshore seismic refraction data, that were acquired in September and October 2014, during the ENAM Community Seismic Experiment offshore North Carolina. Five geophysical transects of this recent project characterize the rifted margin of the eastern United States. The wide-angle seismic refractions from these data will show the variation in deep structure from the continental crust onshore to ocean crust beneath the abyssal plain.

Example of a marine seismic refraction record

Seismic data acquisition map for the ENAM Community Seismic Experiment. Blue and red lines represent tracks of the R/V Marcus Langseth; yellow circles mark the location of short-period ocean-bottom seismometers.

Interested participants should send a statement summarizing why they wish to attend the workshop, together with a short CV, to gail@ig.utexas.edu. Limited travel funds are available for participants.

Application deadline is March 15, 2015.

For more information, contact the instructors Harm Van Avendonk (harm@ig.utexas.edu) and Gail Christeson (gail@ig.utexas.edu).

Useful links:

The GeoPRISMS ENAM initiative

The ENAM Community Seismic Experiment project website

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The GeoPRISMS Office is now hosted by University of Michigan.
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Please see below for sessions of interest to the GeoPRISMS Community, taking place at the AGU/CGU Joint Assembly in Montreal, Canada (3-7 May, 2015) and the Japan Geoscience Union in Makuhari Messe, Japan (24-28 May, 2015)

Joint Assembly abstract deadline is January 14, 2015

Japan Geoscience Union abstract deadline is February 18, 2015

> More information about GeoPRISMS related meetings available online

—————– 2015 AGU/CGU Joint Assembly—————–

Session Title: Understanding slow slip and tectonic tremor process along a variety of deformation boundaries

Conveners: Yajing Liu and Rebecca Harrington

Slow slip phenomena refer to the release of strain energy within a period longer than it typically takes for a dynamic earthquake of the equivalent size. A wide spectrum of slow slip phenomena, including episodic slow slip events, low-frequency earthquakes, afterslip, and transient glacial movement, have been reported along different types of deformation boundaries, but their underlying physical mechanism and potential interaction with dynamic earthquakes remains elusive. In this session we aim to integrate seismic and geodetic observations on direct imaging of the slow slip environment and the transition zone, as well as field, experimental and numerical investigations on the physical mechanism of slow slip phenomena. We invite abstracts focusing on the spatiotemporal evolution of source properties of slow slip observations, and on experimental and theoretical topics that explore possible sources of pressurized fluids and the role they play in the slow slip process.

—————– Japan Geoscience Union 2015—————–

S-CG14. Mixed volatiles in subduction zones; Physical and chemical properties and processes

Principal volatiles in subduction zones and CO2 and H2O derived from devolatilization of carbonate and hydrous minerals in subducted oceanic crust and upper mantle. In the forearc region, highly reduced CH4 may be formed via deserpentinization of forarc mantle. Halogens (F and Cl) are can also be transported at least to upper mantle depth. Fluorine may, in fact, enhance the P-T stability of hydrous minerals.Release of volatiles causes changes in elastic properties of the residual devolatilized rocks, which, in turn, governs seismic velocities, density, shear strength, and compressibility. The intergranular pore fluid also affects these properties. Whether or not fluid forms an interconnected network is critical for these properties. Fluid interconnectivity also controls the extent to which the fluid fluxes melting in and above subducting slabs and the trace and isotopic signatures of the source materials of melting. Physical properties of magma affect style of eruption. These properties, in turn, are affected by H2O/CO2 and F/Cl abundance ratios.

This session will focus on observations, experiments and theory to aid our understanding of

1. Relationship between fluid composition, pressure and temperature and connectivity of intergranular fluid

2. Shear strength and elastic properties of volatile-bearing mineral assemblages

3. Pressure(depth)-temperature and redox-controlled stability of volatile-bearing minerals in subduction zones and beyond

4. Melting phase relations and volatile compositions in subduction zones

5. Seismic activity and its relation to volatiles in minerals and in fluids and in melts

6. Solubility and solution mechanisms of major, mineral, and trace elements in silicate-saturated mixed fluids.

7. Silicate-saturated fluids and volatile-saturated melts and alteration processes in subduction zones.

8. Volatiles and style of volcanic eruption

Please visit URLs: http://www.jpgu.org/index-e.html, and http://www.jpgu.org/meeting_e, for more information about the meeting, relevant dates, its objectives, history and venue and/or contact us directly.

We truly hope you would want to contribute to this session.

Bjorn O. MYSEN

Eiji OHTANI

Dapeng Zhao

Please see below for sessions of interest to the GeoPRISMS Community, taking place at the 2015 EGU General Assembly in Vienna, Austria (12-17 April) and the 2015 SSA Meeting in Pasadena, California (21-23 April)

EGU Abstract deadline is January 7, 2015, 13:00 Central European Time

SSA Abstract deadline is January 9, 2015, 5 PM PST
—————– EGU sessions—————–

TS5.1/GD5.5. The evolution and architecture of rifts and rifted passive margins: observations and modelling (co-organized)

The formation of rifted continental margins by extension of continental lithosphere leading to seafloor spreading is a complex and still poorly understood component of the plate tectonic cycle. New observations and modelling allow us to investigate the underlying processes. Key questions that need to be resolved include 1) factors that control the geometry and crustal architecture or rifted margins, 2) the role of strain localisation and strain partitioning throughout the rift history, 3) processes responsible for anomalous vertical motions during basin evolution such as phase changes or small scale convective instability of the mantle lithosphere, 4) fundamental controls on the magmatic or a-magmatic nature of rifts and passive margins, 5) interaction between surface processes, tectonics, and climate during rift-passive margin evolution. We encourage abstracts that offer new insights into crustal and lithospheric architecture and processes underlying rifting and passive margin formation as well as smaller scale studies of individual sedimentary basins, using constraints from observations and modelling.

Convenors: Ritske S. Huismans, Delphine Rouby, Magdalena Scheck-Wenderoth, Sylvie Leroy, Jan Inge Faleide

Link to the session: http://meetingorganizer.copernicus.org/EGU2015/session/17510

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TS4.2/EMRP4.10/SM2.2. Mechanical Heterogeneity And Its Transient Evolution Along Fault Zones

Geophysical studies of recent well-monitored mega-earthquakes are able to reveal, with increasing resolution, the complex mechanical heterogeneities along faults (differential locking behavior, differential rupture behavior, rheological and structural variations, among others). Furthermore, observations of various transient events (afterslip, slow slip, tectonic tremors, low frequency earthquakes, viscoelastic relaxation) also evidence the temporal evolution of fault systems. While fault heterogeneities seem to have first order controls on the pattern of strain accumulation/release and carry fundamental information about the mechanical setting of faults, we have limited physical and mechanical understanding of what causes these heterogeneities, their kinematics and transient evolution between major events, and how they ultimately influence the largest seismic events.

We aim to integrate studies from various disciplines in order to compare different observations and provide insights into the physical and transient properties of fault heterogeneities and their relation to earthquakes.

Contributions from geologists, seismologists, geodesists, experimentalists, and modellers are invited, especially studies from recent great earthquakes.

Some suggested topics are:

Roughness/asperities/geometry of faults

Geodetic records of fault slip in different periods of the earthquake cycle

Co-seismic slip inferred from seismic records of various frequencies

Spatiotemporal variation of seismicity and transient events, seismic vs. aseismic slip

Seismic and electromagnetic attributes around faults from tomography

Relation between fault heterogeneity and rock physical/rheological properties

Numerical modelling of fault zone kinematics

Conveners: Marcos Moreno, Hiroki Sone, Stephen Hicks

Link to session: http://meetingorganizer.copernicus.org/EGU2015/session/17509

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TS6.5/GMPV4.7. Crustal construction processes from the Backarc-Arc to the Forearc and the origin of ophiolites of belts and subduction arcs.

This session aims at gathering 4 different communities that work on related problems but that typically do not share discussions.

We would like to gather the communities working on:

1) Ophiolites in Alpine-Himalayan settings.

2) Ophiolites in subduction-related Pacific arcs.

3) Crustal structure in Back-arc, Arc, and Forearc settings of subduction zones.

4) Crustal structure formed at Mid Ocean Ridges.

DEBATE SCOPE

Based on their tectonic history and chemistry the majority of Alpine-Himalayan Ophiolites are interpreted as formed in a Back-arc to Arc setting, but the origin of some Alpine-Himalayan Ophiolites in a Mid Ocean Ridge setting is also under debate. In contrast, ophiolitic complexes found in Pacific arcs are commonly interpreted as created in Arc to Forearc settings, and often related to subduction initiation processes.

It is important to recall that much of what has been learned from ophiolite field studies in the last ~50 years has been widely used to interpret the structure of the oceanic lithosphere flooring most of today’s oceans, and that was formed at oceanic spreading centers, mainly at Mid Ocean Ridges, where in fact most ophioltes may not have been formed.

Interestingly, the comparatively abundant studies of the crustal structure formed at Mid Ocean Ridge have been rarely compared to observations of Back-arc, Arc, and Forearc settings, where most ophiolites were arguably created.

We would like to incite an across-communities discussion of those and related open topics, and encourage contributions that study processes of mountain building (e.g. Alpine-Himalayan) and/or subduction at arcs (e.g. Pacific arcs) and relate them to models of ophiolite formation. In addition we encourage presentations that study active processes of oceanic lithosphere creation in Back-arc, Arc, and Forearc systems of subduction zones, as well as crustal accretion at Mid Ocean Ridges before obduction and relate/compare them to the structure of ophiolites. We also welcome contributions that debate on oceanic lithosphere creation and/or ophiolite formation on any scope, time and space scale that contribute to the currently little explored debate on the contrasting views of the different communities.

Conveners: C. R. Ranero, C. Garrido, C. Faccenna, P. Agard.

Link to session: http://meetingorganizer.copernicus.org/EGU2015/session/17652

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TS8.2/EMRP4.4/GD1.2/GM1.7/GMPV7.12/PS9.10/SSS12.17. 200 years of modelling of geological processes

Convener: Vincent Strak

Co-conveners: Joao Duarte, Wouter Schellart, Fabien Graveleau, Filipe Rosas, Susanne Buiter

Analogue and numerical modelling are an essential tool – and possibly the most successful tool – to study the evolution of long-term geological processes. Since the first publication of laboratory experiments by Sir James Hall (1815) to model folds observed in geological strata two centuries ago, modelling has seen major advances and breakthroughs. The emergence of new techniques in the laboratory, the advent of the scaling theory (Hubbert, 1937), and the development of numerical algorithms, codes and fast computers have all contributed to create the discipline of modelling as we know it today. Resulting studies have focused on a large range of geological processes such as mantle convection, subduction, mountain building, rifting, accretionary wedge processes, crustal deformation, interaction between tectonics and surface processes, and volcanic processes. This session aims to present both historical overviews and new studies on geodynamic and tectonic modelling of geological processes from the crustal scale to the planetary scale, providing a unique opportunity to celebrate the 200th anniversary of modelling of geological processes.

Geodynamics sessions:

GD1 – Geodynamics General Sessions

GD1.1.Open Session in Geodynamics (posters only)

GD2 – Crust, Lithosphere, and Asthenosphere: Observations and models

GD2.1/GMPV7.8/SM6.10/TS9.4. Formation and evolution of the ocean plates

GD2.2/GMPV3.4. Geodynamics of continental crust and upper mantle, and the nature of mantle discontinuities

GD2.3/GMPV3.6. Mantle roots of deep seated magmas: origin and evolution of layered mantle lithosphere in different geodynamic setting

GD3 – Mantle Dynamics: Linking deep and shallow processes

GD3.1/EMRP4.16/GMPV3.5/PS9.4/SM6.13. Mantle dynamics in the Earth and other planetary bodies

GD3.2. Lower mantle heterogeneity – linking slab and LLSVP dynamics

GD3.3/TS7.3. Linking plate tectonics and mantle dynamics through the records of lithospheric motions and deformation

GD3.4/GM3.5/SM6.12/TS3.9. Topo-Europe: Linking mantle dynamics and shallow processes

GD4 – Core Dynamics

GD4.1/EMRP4.14/PS9.8. Earth’s core structure and dynamics: observations, models, experiments

GD4.2/EMRP4.15/PS9.9. Boundary control on the geodynamo

GD5 – Plate Tectonics and Geodynamics

GD5.1/EMRP4.17/GMPV7.7. Subduction dynamics from surface to deep mantle

GD5.2/EMRP4.18/SM6.6/TS6.11. Observations and modeling of subduction-driven deformation in the overlying plate and related feedbacks on the subduction process

GD5.3/GMPV7.10/SM6.11/TS6.10. Orogenesis and geodynamics related to the collision of large- and micro-plates

GD5.4/TS5.7. Mantle dynamics, rifting and post-breakup evolution of passive continental margins: Geological and geophysical observations and models with emphasis on the Atlantic Ocean

GD6 – Regional Geodynamics.

GD6.1/SM6.9/TS7.4. The Arctic connection – plate tectonics and mantle dynamics in the North Atlantic, North Pacific and the High Arctic

GD6.2/CR2.5. Geodynamic evolution of the polar regions and interaction with the cryosphere

GD7 – Experimental/Theoretical Studies on Earth Materials Relevant to Geodynamics

GD7.1/EMRP4.19/TS8.10. Long-term rheological behavior of the crust and mantle inferred from observations and models at laboratory and geological time and spatial scales

GD7.2/EMRP4.20/SM5.4. Anisotropy from crust to core: Observations, models and implications

GD7.3/EMRP4.21/TS2.10. Experimental/Theoretical Studies on Earth Materials Relevant to Geodynamics

GD8 – Integrated Geophysical Observations and Modeling in Geodynamics

GD8.1/TS8.9. Recent advances in computational geodynamics

GD8.2/EMRP4.22/GMPV3.7. Compositional geodynamics: The role of phase transitions, partial melting, and metamorphic reactions in mantle convection and plate tectonics

GD8.3/ERE4.5. Geodynamics in service of petroleum and mineral exploration

GD8.4/CR2.6/ERE3.9. Thermal heterogeneity of continental and oceanic lithosphere: from borehole data to regional and global thermal models (PICO Session)
—————– SSA sessions—————–

Session Title: How Reliable Are Reconstructions and Models of Surface-Rupturing Earthquakes?

Historic surface-rupturing earthquakes have demonstrated a potential for complex, discontinuous rupture traces. With this in mind, how well do reconstructions and models of past ruptures from paleoseismology, geomorphologic slip-rate studies, or finite fault models and forecasts of future surface-rupturing earthquakes [e.g. UCERF3 (CA), WGUEP (UT), J-SHIS (Japan)] realistically describe the complexity of surface ruptures? Are earthquake magnitudes and rupture lengths from empirically-based models consistent with individual field-based observations (e.g. timing, displacement) of past events)? This session will highlight advancements in earthquake science that improve our understanding of fault segmentation, rupture dynamics, distributed deformation, along-strike and down-dip fault-slip gradients, and related seismic hazard topics. We welcome abstracts from a wide spectrum of scientists, including paleoseismologic studies of Quaternary-active structures, detailed studies of modern ruptures, and dynamic or simulator models of rupture scenarios. We invite discussion of new, innovative approaches that characterize active structures and earthquakes using field-based techniques, computer modeling, and remote sensing. The goal of this session will be to consider ways to improve the documentation of past earthquakes and to advance our estimates of earthquake probabilities.

Conveners: Scott Bennett (USGS Golden), Kate Scharer (USGS Pasadena), Julian Lozos (Stanford/USGS Menlo Park)

Invited Speakers: James Dolan (USC), Eileen Evans (USGS), Jacqui Gilchrist (UC Riverside)

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Session Title: Slow Earthquakes: Diversity in Fault Motion and Their Implications in Earthquake Dynamics

Earthquake faults show a variety of motion – from slow slip and associated tremor to supershear rupture. Slow earthquakes emerge as a major player in releasing and redistributing stress over much of the seismic cycles. They are observed globally over multiple spatial and temporal scales. A unifying theory connecting this diversity and its implications on the fault dynamics, however, remains elusive. Moreover, the factors (fault properties, rheology, frictional and material heterogeneity etc.) controlling varied fault slip behaviors and their interplay are poorly understood. We invite abstracts that highlight different aspects of this broad spectrum of fault slip including, but not limited to, slow earthquakes and associated phenomena. We are interested in slow earthquakes in all forms and sizes – from episodic tremor and slip in the subduction zones to seismic swarms operating in smaller scales. Studies encompassing multiple styles of fault slip (slow and fast) and their interactions in space and time are encouraged. We solicit new observations and analyses from all tectonic settings using seismology, geodesy, numerical simulations, laboratory and field experiments.

Conveners: Abhijit Ghosh (University of California-Riverside), Christodoulos Kyriakopoulos (University of California-Riverside), Hongfeng Yang (The Chinese University of Hong Kong)

A workshop on “Feedbacks and coupling among surface processes, climate and tectonics during mountain building” will be held in Taipei Taiwan from June 1 to June 8th, 2015.

The workshop will include 3 days of meeting and 2 to 3 days of field trips.

A townhall is organized at AGU to discuss the workshop:
Wednesday 17, 6 to 8pm
Westin Market Street
50 3rd street (near corner with Market Str.)
Stanford room on the 3rd floor

All are invited.

Tim (tim.byrne@uconn.edu)

Jian-Cheng Lee (jclee@earth.sinica.edu.tw)
US Organizing Committee:
Tim Byrne
Jean Crespi
Eric Kirby
Brian Yanites
Francis Wu

Join us for the GeoPRISMS Townhall Meeting and Community / Student Forum at the 2014 AGU Fall Meeting!

When: AGU Fall Meeting 2014 – Monday December 15 at 6:00 PM

Where: Westin Market Street San Francisco Hotel, 50 Third Street – Franciscan Ballroom

(between Mission and Market)

The event is open to all with interests in the GeoPRISMS Program and GeoPRISMS (or MARGINS) research. Come hear updates about the GeoPRISMS Program, the latest GeoPRISMS research projects & study areas, and ongoing GeoPRISMS research from student presenters.

* A short formal session (starting at 6:30pm) will include welcome opening remarks from the GeoPRISMS Chair Peter van Keken and updates from NSF Program Managers Jenn Wade and Donna Blackman.

* Andrew Goodwillie, from LDEO University of Columbia, will give a short presentation on the GeoPRISMS Data Portal and how it can help you find your data.

* Jeffrey Freymueller, from University of Alaska Fairbanks, will give an overview of GeoPRISMS Science in the Alaska and Aleutian Primary Site.

Student entrants for the GeoPRISMS Prize for Outstanding Student Presentations are also invited to display their AGU posters (or poster versions of their AGU talks) and discuss their research with event participants. This will be a great opportunity for students to share their results further and to interact with a wide spectrum of GeoPRISMS scientists.

There will be ample time to mingle, and refreshments will be available. Among those present will be Peter van Keken (GeoPRISMS Chair), members of the GeoPRISMS Steering and Oversight Committee, and Program Managers for GeoPRISMS from the National Science Foundation (NSF).

We hope to see you there.

The GeoPRISMS Office

More information about the the AGU Townhall, Student Prize Competition, Mini-Workshops, and GeoPRISMS-related sessions: /meetings/agu-townhall-and-student-forum/

Questions? Contact the GeoPRISMS Office: info@geoprisms.nineplanetsllc.com

Join us for the GeoPRISMS Townhall Meeting and Community / Student Forum at the 2014 AGU Fall Meeting!

When: AGU Fall Meeting 2014 – Monday December 15 at 6:00 PM

Where: Westin Market Street San Francisco Hotel, 50 Third Street – Franciscan Ballroom

(between Mission and Market)

The event is open to all with interests in the GeoPRISMS Program and GeoPRISMS (or MARGINS) research. Come hear updates about the GeoPRISMS Program, the latest GeoPRISMS research projects & study areas, and ongoing GeoPRISMS research from student presenters.

* A short formal session (starting at 6:30pm) will include welcome opening remarks from the GeoPRISMS Chair Peter van Keken and updates from NSF Program Managers Jenn Wade and Donna Blackman.

* Andrew Goodwillie, from LDEO University of Columbia, will give a short presentation on the GeoPRISMS Data Portal and how it can help you find your data.

* Jeffrey Freymueller, from University of Alaska Fairbanks, will give an overview of GeoPRISMS Science in the Alaska and Aleutian Primary Site.

Student entrants for the GeoPRISMS Prize for Outstanding Student Presentations are also invited to display their AGU posters (or poster versions of their AGU talks) and discuss their research with event participants. This will be a great opportunity for students to share their results further and to interact with a wide spectrum of GeoPRISMS scientists.

There will be ample time to mingle, and refreshments will be available. Among those present will be Peter van Keken (GeoPRISMS Chair), members of the GeoPRISMS Steering and Oversight Committee, and Program Managers for GeoPRISMS from the National Science Foundation (NSF).

We hope to see you there.

The GeoPRISMS Office

More information about the the AGU Townhall, Student Prize Competition, Mini-Workshops, and GeoPRISMS-related sessions: /meetings/agu-townhall-and-student-forum/

Questions? Contact the GeoPRISMS Office: info@geoprisms.nineplanetsllc.com

Please register for Imaging faulting and hydration in the Alaska subduction zone with the R/V Langseth on Dec 3, 2014 2:00 PM EST at:

https://attendee.gotowebinar.com/register/856323108167966721

Presenter: Donna Shillington, Lamont-Doherty Earth Observatory

Subduction zones worldwide exhibit remarkable variations in seismic activity and slip behavior along strike and down dip. Active-source seismic data can provide essential constraints on the properties of the plate boundary, the distribution of fluids and hydration, and deformation in the overriding and subducting plate, all of which can be used to assess possible contributions to this variability. Here I describe results from a marine active-source seismic study of the subduction zone offshore Alaska.

MCS reflection and wide-angle seismic data were collected offshore from the Alaska Peninsula in the summer of 2011 aboard the R/V Langseth during the Alaska Langseth Experiment to Understand the megaThrust (ALEUT) program. This region encompasses the full spectrum of coupling: 1) the weakly coupled Shumagin Gap; 2) the Semidi segment, which last ruptured in the 1938 M8.2 event, appears to be locked at present, and 3) the western Kodiak asperity, which marked the western extent of the 1964 M9.2 rupture and also appears to be locked. It also exhibits substantial variations in seismicity. ALEUT data reveal changes along-strike in incoming sediment thickness and plate structure and along-strike and downdip variations in megathrust reflection characteristics.

Remarkable variations in the style and amount of bending faulting and hydration in the subducting oceanic plate are observed along strike, which appear to be controlled by the local relationship between the orientations of pre-existing structures in the incoming oceanic plate and the subduction zone. Significantly more bending faulting and hydration are observed in the Shumagin Gap, where pre-existing structures are favorably aligned, than the Semidi segment. The thickness of sediment on the incoming plate also changes along strike. Over 1 km of sediment is observed on the incoming oceanic plate in the Semidi segment prior to subduction, and a relatively thick and continuous layer interpreted as subducted sediment can be imaged at the plate boundary here up to ~50 km from the trench. In the Shumagin Gap, where the incoming sediment section is half as thick and more pervasively faulted at the outer rise, a subducting sediment layer is also observed but it is thinner, less continuous and is not observed to continue as far from the trench. These changes in bending faulting, hydration and sediment thickness correlate with variations in interplate and intermediate depth intraslab seismicity. Although the Semidi segment is capable of producing great earthquakes, the comparatively thick sediment here may contribute to the relative paucity of interplate seismicity compared with adjacent segments. More intermediate depth seismicity is observed in the Shumagin Gap, where there is more hydration and bending faulting in the subducting plate.

Downdip variations in the characteristics of the plate boundary are also observed; a simple and bright reflection is generally observed at depths of ~12-25 km, ~40-100 km from the trench, within the center of the estimated locked zone. The character changes where the megathrust appears to intersect the forearc mantle wedge to a wide (~2 km thick), bright band of reflections and may arise from a change in deformation style, distribution of fluids, and/or plate boundary properties. Although the overall patterns in reflection characteristics are consistent between profiles across different segments, this transition in reflection characteristics occurs at larger distances from the trench within the Semidi segment than in the Shumagin Gap.

After registering, you will receive a confirmation email containing information about joining the webinar.

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The GeoPRISMS Office is now hosted by University of Michigan.
Questions? Contact the GeoPRISMS Office at info@geoprisms.nineplanetsllc.com
www.geoprisms.nineplanetsllc.com
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