Geophysics fellow nominations hit by lack of diversity

A section of the American Geophysical Union (AGU) has declined to recommend any of its members for a 2021 fellowship following a lack of diversity among potential nominees.

Virtual Advocacy Days for Science in Times of Crisis: Communications and Engagement Influencing Decision-Making

<p>Communicating the value of science to policymakers has never been more importance, but how do you make a difference while adhering to new norms for physical distancing? Regardless of one’s level of technological aptitude, and no matter if time constraints exist, scientists can still effectively communicate the value of their science to policymakers through virtual means. The Public Affairs team from the American Geophysical Union will share lessons learned from several virtual advocacy events held in 2020 and will cover a few communications strategies for influencing policymakers through virtual science policy engagements—from virtual meetings with policymakers to social media to traditional media.</p>

Diversity, Equity, and Inclusion (DEI) at AGU: New Leadership Commitments and Progress Under an Updated Strategic Plan

<p>The American Geophysical Union (AGU), a global scientific society of >60,000 members, has a series of initiatives underway to address issues of diversity, equity, and inclusion in the Earth and space sciences, including the well-known issues of harassment and its impact on women scientists, and the closely related issues of systemic racism, sexism, ableism, discrimination against LGBTQ community, and their related intersectional issues. Building on its earlier work of establishing an updated AGU Ethics Policy which defines harassment and discrimination as scientific misconduct, AGU has taken additional significant steps over the past 12 months to further advance Diversity, Equity and Inclusion (DEI) practices— including work lead by the AGU Diversity and Inclusion Advisory Committee to launch a public facing AGU D&I dashboard, steps under the updated AGU Strategic plan to provide additional resources for supporting a more equitable and inclusive culture, and work and commitments by AGU leadership to address systemic racism through its “Eight Deliberate Steps.”  This presentation will highlight new AGU DEI-related initiatives most recently underway, including the role of partnerships in helping to achieve the broader DEI culture change objectives, and the associated work across AGU Meetings, Publications, and Honors. Progress to date on these and other emerging new AGU Justice Equity Diversity and Inclusion (JEDI)-related resources and partnership initiatives, including metrics to track the impact of these changes, will be discussed.</p>

Constraints on the pre-eruption thermal and fO2 conditions in the magma reservoir of Ciomadul (SE Carpathians, Romania) based on Fe-Ti oxide geochemistry

<p>Ciomadul is the southernmost eruptive centre of the post-collisional Călimani-Gurghiu-Harghita andesitic-dacitic volcanic chain (SE Carpathians, Romania) and represents the latest manifestation of the Neogene to Quaternary volcanism in the Carpathian-Pannonian Region. Ciomadul consists of older, peripheral shoshonitic to dacitic lava domes formed episodically between 1 Ma and 300 ka and a voluminous, central volcanic complex developed within the last 200 ka. Although several lines of evidence (based on petrology, geophysics and gas monitoring) suggest a long-lived magmatic plumbing system holding a potentially active magma storage (“PAMS” volcano) beneath Ciomadul, the pre-eruptive conditions of the upper crustal magma reservoir (including temperature, oxygen fugacity and TiO<sub>2</sub> activity) are not completely explored so far. In this study 23 rock samples, representing the whole volcanic activity of Ciomadul in time, were involved. Fe-Ti oxide (magnetite-ilmenite) grains were selected from magnetic heavy minerals, but only a few of the samples contained both magnetite and ilmenite crystals. Equilibrium between Ti-magnetite and ilmenite was tested by their chemical composition (Mg/Mn ratios).</p><p>Various geothermobarometer calibrations, including Andersen and Lindsley (1985, 1988) as well as Ghiorso and Evans (2008), were applied to calculate temperature and oxygen fugacity from Fe-Ti oxide compositions. Our results show that, in case of dacitic pyroclastic rocks, temperature values gained by the method of Ghiorso and Evans are significantly lower (640–780 °C) than those obtained by the geothermometers of Andersen and Lindsley (1985, 1988), showing 750–830 and 710–790°C temperatures, respectively. On the other hand, andesitic lava dome rocks of Dealul Mare show higher, 800–900 °C temperature according to all of these methods. The obtained temperature was compared with amphibole-plagioclase thermometry results and this shows a better agreement with the values yielded by the Andersen and Lindsley (1985) Fe-Ti oxide thermometry, particularly for the pumice samples.</p><p>In case of oxygen fugacity, the Ghiorso and Evans (2008) and Andersen and Lindsley (1985) methods showed fairly similar values (fO<sub>2</sub>=0.9–1.8) whereas the Andersen and Lindsley (1988) calculations gave higher oxygen fugacity (fO<sub>2</sub>=1.1–2.5). Nevertheless, these results, irrespective the applied calculation methods, suggest relatively oxidized conditions (ΔNNO>1) what is comparable with many other andesitic to dacitic volcanic systems (e.g. Mount St. Helens, Mount Unzen, Santorini). Values of TiO<sub>2</sub> activity was calculated and obtained a range between 0.76 and 0.98 what is consistent with the common presence of titanite.</p><p> </p><p>This study was financed by NKFIH K135179 project.</p><p> </p><p>Andersen, D.J. & Lindsley, D.H. (1985). EOS Transactions of the American Geophysical Union, 66, 416.</p><p>Andersen, D.J. & Lindsley, D.H. (1988). Amer Miner 73:714–726.</p><p>Ghiorso, M.S. & Evans, B.W. (2008). Amer J Sci 308:957–1039.</p>

Inspiring creativity in science-inspired art and music in the digital world.

<p>The mission of the American Geophysical Union’s Sharing Science program is to provide scientists with the skills, tools, and opportunities they need to share their science with any audience. While we in the program possess the skills and expertise to do this, we also believe that it’s beneficial for artists to learn from, and be inspired by, their peers. To achieve this goal, we created a digital space for science artists to share their work and creative processes.</p><p>In 2020, we launched two specials series on our blog: AGU Rocks and Drawn to Geoscience. The purpose of these series was to highlight scientists who write songs and create illustrations about science. We not only wanted to showcase the amazing creative work of science artists but also have them explain their creative and technical processes in as effort to lower the barrier to entry for those who may be interested in pursuing similar creative efforts but don’t know where to start.</p><p>By the end of 2020, we received over 40 AGU and Drawn to Geoscience contributions with a queue of posts scheduled for 2021. Because of the huge outpouring of submissions and demonstrated enthusiasm for the content, we are planning to expand this into a hub for all forms of scicomm via art where science artists can learn from, and be inspired by, their peers, and scientists and non-scientists alike can learn about diverse aspects of science in engaging and accessible ways. </p>

Fluid Flux in Fractured Rock of the Alpine Fault Hanging-Wall Determined from Temperature Logs in the DFDP-2B Borehole, New Zealand

©2018. American Geophysical Union. All Rights Reserved. Sixteen temperature logs were acquired during breaks in drilling of the 893m-deep DFDP-2B borehole, which is in the Alpine Fault hanging-wall. The logs record various states of temperature recovery after thermal disturbances induced by mud circulation. The long-wavelength temperature signal in each log was estimated using a sixth-order polynomial, and residual (reduced) temperature logs were analyzed by fitting discrete template wavelets defined by depth, amplitude, and width parameters. Almost two hundred wavelets are correlated between multiple logs. Anomalies generally have amplitudes <1°C, and downhole widths <20m. The largest amplitudes are found in the first day after mud circulation stops, but many anomalies persist with similar amplitude for up to 15 days. Our models show that thermal and hydraulic diffusive processes are dominant during the first few days of re-equilibration after mud circulation stops, and fluid advection of heat in the surrounding rock produces temperature anomalies that may persist for several weeks. Models indicate that the fluid flux normal to the borehole within fractured zones is of order 10−7 to 10−6 m s−1, which is 2–3 orders of magnitude higher than the regional flux. Our approach could be applied more widely to boreholes, as it uses the thermal re-equilibration phase to derive useful information about the surrounding rock mass and its fluid flow regime.

The Alpine Fault hanging-wall viewed from within: Structural analysis of the ultrasonic image logs in the DFDP-2B borehole, New Zealand

©2018. American Geophysical Union. All Rights Reserved. Ultrasonic image logs acquired in the DFDP-2B borehole yield the first continuous, subsurface description of the transition from schist to mylonite in the hangingwall of the Alpine Fault, New Zealand, to a depth of 818 m below surface. Three feature sets are delineated. One set, comprising foliation and foliation-parallel veins and fractures, has a constant orientation. The average dip direction of 145° is subparallel to the dip direction of the Alpine Fault, and the average dip magnitude of 60° is similar to nearby outcrop observations of foliation in the Alpine mylonites that occur immediately above the Alpine Fault. We suggest that this foliation orientation is similar to the Alpine Fault plane at ∼1 km depth in the Whataroa valley. The other two auxiliary feature sets are interpreted as joints based on their morphology and orientation. Subvertical joints with NW-SE (137°) strike occurring dominantly above ∼500 m are interpreted as being formed during the exhumation and unloading of the Alpine Fault's hangingwall. Gently dipping joints, predominantly observed below ∼500 m, are interpreted as inherited hydrofractures exhumed from their depth of formation. These three fracture sets, combined with subsidiary brecciated fault zones, define the fluid pathways and anisotropic permeability directions. In addition, high topographic relief, which perturbs the stress tensor, likely enhances the slip potential and thus permeability of subvertical fractures below the ridges, and of gently dipping fractures below the valleys. Thus, DFDP-2B borehole observations support the inference of a large zone of enhanced permeability in the hangingwall of the Alpine Fault.

Fluid Flux in Fractured Rock of the Alpine Fault Hanging-Wall Determined from Temperature Logs in the DFDP-2B Borehole, New Zealand

©2018. American Geophysical Union. All Rights Reserved. Sixteen temperature logs were acquired during breaks in drilling of the 893m-deep DFDP-2B borehole, which is in the Alpine Fault hanging-wall. The logs record various states of temperature recovery after thermal disturbances induced by mud circulation. The long-wavelength temperature signal in each log was estimated using a sixth-order polynomial, and residual (reduced) temperature logs were analyzed by fitting discrete template wavelets defined by depth, amplitude, and width parameters. Almost two hundred wavelets are correlated between multiple logs. Anomalies generally have amplitudes <1°C, and downhole widths <20m. The largest amplitudes are found in the first day after mud circulation stops, but many anomalies persist with similar amplitude for up to 15 days. Our models show that thermal and hydraulic diffusive processes are dominant during the first few days of re-equilibration after mud circulation stops, and fluid advection of heat in the surrounding rock produces temperature anomalies that may persist for several weeks. Models indicate that the fluid flux normal to the borehole within fractured zones is of order 10−7 to 10−6 m s−1, which is 2–3 orders of magnitude higher than the regional flux. Our approach could be applied more widely to boreholes, as it uses the thermal re-equilibration phase to derive useful information about the surrounding rock mass and its fluid flow regime.