USAP-DC

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Collaborative Research: Imaging Seismic Heterogeneity within the Antarctic Mantle with Full Waveform Ambient Noise Tomography Short Title: Full Waveform Ambient Noise Tomography in Antarctica Start Date: 2017-03-01 End Date: 2020-08-31 Description/Abstract Our project is focused on better resolving the three-dimensional Antarctic mantle structure to further understanding of continental tectonics. To accomplish this, we are utilizing a full-waveform tomographic inversion technique that incorporates long-period ambient noise data and which has been shown to more accurately resolve structure than traditional tomographic approaches. The new models have been developed using the Alabama supercomputer facilities in conjunction with software developed at The University of Rhode Island. Our new tomographic results highlight the lithospheric structure beneath the Wilkes and Aurora Subglacial Basins in East Antarctica, where previous rifting episodes and mid-lithospheric discontinuities are being explored. In West Antarctica, the work is elucidating the easternmost extent of the West Antarctic Rift System as well as rifted structure and possible compositional variations within the Weddell Sea. We are also highlighting regions of Antarctica where tomographic resolution is still lacking and where future deployments are needed to improve resolution. Personnel Person Role Emry, Erica Investigator and contact Hansen, Samantha Co-Investigator Funding Antarctic Earth Sciences Award # 1643873 Antarctic Earth Sciences Award # 1643798 AMD - DIF Record(s) USAP-1643873_1 Data Management Plan None in the Database Product Level: 1 (processed data) Datasets Repository Title (link) Format(s) Status IRIS GEOSCOPE Network Not Provided exists IRIS IU: Global Seismograph Network Not Provided exists IRIS XP (2000-2004): A Broadband Seismic Investigation of Deep Continental Structure Across the East-West Antarctic Boundary Not Provided exists IRIS YT (2007-2023): IPY POLENET-Antarctica: Investigating links between geodynamics and ice sheets Not Provided exists IRIS ZM (2007-2013): A Broadband Seismic Experiment to Image the Lithosphere beneath the Gamburtsev Mountains, East Antarctica Not Provided exists IRIS ZJ (2012-2015): Transantarctic Mountains Northern Network Not Provided exists USAP-DC Shear Wave Velocity of the Antarctic Upper Mantle from Full Waveform Inversion and Long Period Ambient Seismic Noise netcdf; png exists Publications Kumar, A., E.L. Emry, and S.E. Hansen, Shear-wave Velocity Structure of the Crust and Upper Mantle beneath East Antarctica from Full-Waveform Ambient Noise Tomography, Scientific Committee on Antarctic Research virtual conference, Abstract 698, 2020. Kumar, A., E.L. Emry, and S.E. Hansen, Characterizing Crustal and Upper Mantle Structure in East Antarctica with Full-Waveform Ambient Noise Tomography, American Geophysical Union Fall virtual conference, Abstract G012-0020, 2020. Kumar, A., E.L. Emry, and S.E. Hansen, Crustal and Upper Mantle Structure beneath the Wilkes and Aurora Subglacial Basins, East Antarctica from Full-Waveform Ambient Noise Tomography, American Geophysical Union Fall conference, Abstract C21F-1514, San Francisco, CA, 2019. Emry, E., S. Hansen, A. Kumar, and Y. Shen, Quantitative assessment of Antarctic crustal models using numerical wave simulations, International Symposium on Antarctic Earth Science conference, Abstract A312, Incheon, South Korea, 2019. Horton, A.C., E. Emry, S.E. Hansen, J. van Wijk, J.P. O'Donnell, A. Brisbourne, G.W. Stuart, S. Anandakrishnan, R.C. Aster, A.D. Huerta, A. Nyblade, D. Wiens, J.P. Winberry, and T.J. Wilson, Mantle transition zone beneath West Antarctica: Expanded mapping in previously unstudied region, American Geophysical Fall conference, Abstract DI31C-0025, Washington D.C., 2018. Emry, E.L., A.A. Nyblade, A. Horton, S.E. Hansen, J. Juli\u00e0, R.C. Aster, A.D. Huerta, J.P. Winberry, D.A. Wiens, and T.J. Wilson, Prominent thermal anomalies in the mantle transition zone beneath the Transantarctic Mountains, Geology, 48, 2020. (doi:10.1130/G47346.1) Emry, E. L., Shen, Y., Nyblade, A. A., Flinders, A., & Bao, X. (2019). Upper Mantle Earth Structure in Africa From Full‐Wave Ambient Noise Tomography. Geochemistry, Geophysics, Geosystems, 20(1), 120–147. (doi:10.1029/2018gc007804) E.L. Emry and S.E. Hansen, Patterns of Segmentation in the East Antarctic Lithosphere from Full-waveform Inversion and Long-period Ambient Noise Tomography, American Geophysical Fall conference, Abstract T23A-03, Chicago, 2022. Keywords Amd/Us Antarctica POLNET SEISMIC SURFACE WAVES TECTONICS Platforms and Instruments SEISMOGRAPHS SEISMOLOGICAL STATIONS