DI015
Time-Dependency of Earth's Mechanical Behaviour: a Synthesis of Observational, Laboratory, and Theoretical Approaches
Session ID#: 249600
Session Description:
To fit a multitude of geophysical observations, from seismic attenuation to post-glacial relaxation, Earth's mantle must respond to stress in a more complex fashion than a simple Maxwell (elastic viscous) model. Understanding the time-dependent, "transient" response of rocks between these endmember regimes is essential for an accurate description of Earth's mechanical behaviour. Moreover, the precise nature of the transient behaviour encodes information about Earth's present thermodynamic state, microphysics, and even (via crystallographic fabrics and grain size) stress and strain history. We invite contributions from the seismology, geodesy, rock-physics, and geodynamics communities to evaluate and assimilate recent progress on understanding Earth’s transient mechanics. Particular topics of interest include (but are not limited to): new lab observations of, or theoretical descriptions for, grain-scale deformation; attenuation/viscosity anisotropy; the role of partial melt; multifrequency approaches that span orders of magnitude in frequency and space; and novel geophysical measurements that address Earth's transient mechanics.
Co-Sponsor(s):
Index Terms:
1207 Transient deformation [GEODESY AND GRAVITY]
5144 Wave attenuation [PHYSICAL PROPERTIES OF ROCKS]
8124 Earth's interior: composition and state [TECTONOPHYSICS]
8162 Rheology: mantle [TECTONOPHYSICS]
Primary Convener: Lars N Hansen, University of Minnesota Twin Cities, Earth and Environmental Sciences, Minneapolis, United States
Conveners: Colleen A Dalton, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States and Maximiliano Bezada, University of Minnesota, Earth & Environmental Sciences, Minneapolis, United States
Student/Early Career Convener: Hatsuki Yamauchi, Lamont Doherty Earth Observatory, Columbia University, Palisades, United States
Rheological Heterogeneity and Dynamics of Oceanic Asthenosphere from Seismic Attenuation (1898991)
Joshua B Russell, Syracuse University, Department of Earth and Environmental Sciences, Syracuse, NY, United States, Colleen A Dalton, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, Christopher Havlin, University of Illinois at Urbana Champaign, Urbana, United States, Benjamin K Holtzman, Lamont Doherty Earth Observatory, Columbia Univ., Palisades, NY, United States, Zachary Eilon, University of California Santa Barbara, Earth Science, Santa Barbara, United States, James B Gaherty, School of Earth and Sustainability, Northern Arizona University, Flagstaff, United States, Joseph Phillips, Northern Arizona University, School of Earth and Sustainability, Flagstaff, United States, Anant Hariharan, University of California Santa Barbara, Earth Science, Santa Barbara, CA, United States and Donald W Forsyth, Brown Univ, Providence, United States
Constraining the Effect of Pressure on Transient Dislocation-Accommodated Deformation (1944907)
Thomas Breithaupt1, Lars N Hansen2, Jessica White3, Diede Hein2, Emmett Ela2 and David Wallis1, (1)University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, (2)University of Minnesota - Twin Cities, Department of Earth and Environmental Sciences, Minneapolis, United States, (3)University of Southern California, Department of Earth Sciences, Los Angeles, CA, United States
A Thermodynamic framework for development of constitutive models for non-linear deforming solids : Framework, Computational Tools, and Seismo-Acoustic analysis (1954609)
Tushar Mittal, Pennsylvania State University Main Campus, University Park, United States and Benjamin K Holtzman, Lamont Doherty Earth Observatory, Columbia Univ., Palisades, NY, United States
Structure of the Antarctic Uppermost Mantle: Regional-Scale Rayleigh Phase Velocity and Attenuation (1963689)
Hannah Elaine Krueger, Radford University, Radford, VA, United States, Colleen A Dalton, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, RI, United States, Karen M Fischer, Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, United States and Joshua B Russell, Syracuse University, Earth and Environmental Sciences, Syracuse, NY, United States
A high Qs structure in the uppermost lower mantle beneath Central America related to the Farallon Anomaly (1974945)
Fan Wang1, Meichen Liu2, Jeroen Ritsema3 and Yihe Huang3, (1)University of Michigan Ann Arbor, Department of Earth and Environmental Sciences, Ann Arbor, MI, United States, (2)California Institute of Technology, Seismological Laboratory, Pasadena, United States, (3)University of Michigan Ann Arbor, Department of Earth and Environmental Sciences, Ann Arbor, United States
Distinguishing between the roles of grain-boundary impurities and incipient melting in seismic wave attenuation and dispersion in synthetic dunite (1981541)
Hitank Kasaundhan1, Jian Yang2, Tongzhang Qu1,3, Kathryn Hayward1, Hayden Miller1, Katharina Marquardt4, Ulrich Faul5 and Ian Jackson1, (1)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, (2)China University of Petroleum, East China, Qingdao, PRC, China, (3)University College London, Department of Earth Sciences, London, United Kingdom, (4)University of Oxford, Department of Materials, Oxford, United Kingdom, (5)Massachusetts Institute of Technology, Earth Atmospheric and Planetary Sciences, Cambridge, MA, United States
