DI008
Exploring the Earth's core: a multidisciplinary approach

Session ID#: 76569

Session Description:
The Earth's core is the most unreachable place in our planet. It is one of Earth’s most active regions, with convection of its molten iron alloy generating the magnetic field observed at the surface of the Earth, and the inner core slowly growing at the expense of the outer core. Understanding the present day properties and long and short term evolution of both the liquid outer core and solid inner core requires discussion and collaboration between computational, theoretical, experimental and observational researchers. For example, constraints on material properties such as the thermal conductivity are still under debate, the structural nature of stratified layers near the outer core’s boundaries remain elusive, and discussions surrounding the inner core crystallization remain ongoing, amongst many other pertinent issues.

We welcome contributions from all disciplines to advance the understanding of the Earth's core including, but not limited to, geochemistry, geodynamics, geomagnetism, mineral physics and seismology.

Co-Organized:
  • MR - Mineral and Rock Physics
  • S - Seismology
Index Terms:

1507 Core processes [GEOMAGNETISM AND PALEOMAGNETISM]
1510 Dynamo: theories and simulations [GEOMAGNETISM AND PALEOMAGNETISM]
3924 High-pressure behavior [MINERAL PHYSICS]
7207 Core [SEISMOLOGY]

Primary Convener:  Marine Lasbleis, Université de Nantes, LPG, CNRS, Nantes, France
Conveners:  Jessica C E Irving, Princeton University, Department of Geosciences, Princeton, NJ, United States, Kenji Ohta, Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan and Jenny Wong, Institut de Physique du Globe de Paris, Paris, France
Primary Liaison:  Marine Lasbleis, Université de Nantes, LPG, CNRS, Nantes, France
 
Evidence for Fe-Si-O Liquid Immiscibility at the Conditions of Earth's Core (Invited) (487875)
Sarah M Arveson1, Jie Deng2, Bijaya B Karki3 and Kanani K M Lee1, (1)Yale University, Department of Geology & Geophysics, New Haven, CT, United States, (2)University of California Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (3)Louisiana State University, Department of Computer Science, Department of Geology & Geophysics, Center for Computation and Technology, Baton Rouge, LA, United States
 
Inner core anisotropy measured using new ultra-polar PKIKP arrivals with corrected raypaths (489411)
Henry Brett and Arwen Fedora Deuss, Utrecht University, Utrecht, Netherlands
 
Anomalous SmKS induced by postcritical reflection and refraction at the core-mantle boundary (490490)
Fenglin Niu, Rice University, Department of Earth Science, Houston, TX, United States and Liwei Wang, China University of Petroleum, Beijing, China
 
Integration of palaeomagnetic data and numerical dynamo simulations support a moderately dipolar geomagnetic field throughout Earth history (490631)
Andrew John Biggin1, Richard Bono2, Courtney Jean Sprain3, Christopher J Davies4, Richard T Holme5, Pavel V Doubrovine6 and Domenico Meduri2, (1)University of Liverpool, Department of Earth, Ocean and Ecological Sciences, Liverpool, L69, United Kingdom, (2)University of Liverpool, Liverpool, United Kingdom, (3)University of Florida, Department of Geological Sciences, Gainesville, FL, United States, (4)University of Leeds, School of Earth and Environment,, Leeds, United Kingdom, (5)Univ Liverpool, Liverpool, United Kingdom, (6)University of Oslo, Oslo, Norway
 
Constraining 1D Inner Core Attenuation through Measurements of Strongly Coupled Normal Mode Pairs (492233)
Sujania Talavera-Soza and Arwen Deuss, Utrecht University, Utrecht, Netherlands
 
Thermal conductivity of an Fe-Si lunar core and thermal convection in an early dynamo (492974)
Meryem Berrada, University of Western Ontario, Earth Sciences, London, ON, Canada, Richard Secco, Univ Western Ontario, London, ON, Canada and Wenjun Yong, University of Western Ontario, London, ON, Canada
 
Steady and Very Slow Rotation of the Inner Core (493669)
John Emilio Vidale, University of Southern California, Los Angeles, CA, United States
 
Electrical resistivity of fcc phase of iron hydrides at high pressures and temperatures (494279)
Kenji Ohta1, Sho Suehiro1, Kei Hirose2 and Yasuo Ohishi3, (1)Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan, (2)Tokyo Inst Tech, Tokyo, Japan, (3)Japan Synchrotron Radiation Research Institute, Hyogo, Japan
 
Melting of iron up to core pressures determined by in-situ electrical resistance jump (495628)
Mingqiang Hou1, Youjun Zhang2, Xueyan Du2, Hongliang Dong2, Limin Yan2, Junyue Wang3, Lin Wang2, Bin Chen2, Li Zhang4 and Jin Liu5, (1)Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, United States, (2)Center for High Pressure Science and Technology Advanced Research, Shanghai, China, (3)Center for High Pressure Science & Technology Advanced Research, Shanghai, China, (4)Hong Kong Polytechnic University, Department of Civil and Environmental Engineering, Hong Kong, Hong Kong, (5)University of Texas at Austin, Austin, TX, United States
 
Thermodynamics in the system Fe-Si-O up to 350 GPa (502379)
Charles-Edouard Boukaré, EPFL Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland and James Badro, Institut de Physique du Globe de Paris, Paris, France
 
Conductivity Limits of Dynamo Action in Earth and Planetary Cores (506398)
Peter E Driscoll, Carnegie Institution for Science Washington, Washington, DC, United States
 
Exploring the velocity structure of the topmost outer core using globally distributed SmKS phases (507859)
Vivian Tang, Northwestern University, Department of Earth and Planetary Sciences, Evanston, IL, United States, Suzan van der Lee, Northwestern Univ, Evanston, IL, United States and Li Zhao Sr, Peking University, Beijing, China
 
Valence state of iron in iron alloys under high pressure: implications for Earth and planetary cores (508424)
Hong Yang, Stanford University, Stanford, CA, United States, Wenzhong Wang, USTC University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China and Wendy L Mao, Stanford-Geological & Env Sci, Stanford, CA, United States
 
Inner core as a two phase mixture of the Fe-Ni-Si alloys (511485)
Eiji Ohtani1, Daijo Ikuta1, Naohisa Hirao2 and Tatsuya Sakamaki1, (1)Tohoku University, Sendai, Japan, (2)JASRI, Hyogo, Japan
 
On shear wave velocity in the top of the Earth’s inner core (512695)
Dmitry Krasnoshchekov, Vladimir Ovtchinnikov and Olga Usoltseva, Institute of Geosphere Dynamics RAS, Moscow, Russia
 
Seismic structure near the inner core boundary in the north polar region (512749)
Toshiki Ohtaki1, Satoru Tanaka2, Satoshi Kaneshima3, Weerachai Siripunvarporn4, Songkhun Boonchaisuk4, Sutthipong Noisagool4, Kenji Kawai5, Taewoon Kim6, Yuki Suzuki5, Yasushi Ishihara6, Koji Miyakawa7, Nozomu Takeuchi8 and Hitoshi Kawakatsu9, (1)Geological Survey of Japan, AIST, Tsukuba, Japan, (2)JAMSTEC, Yokosuka, Japan, (3)Kyushu University, Fukuoka, Japan, (4)Mahidol University, Bangkok, Thailand, (5)The University of Tokyo, Earth and planetary science, Tokyo, Japan, (6)JAMSTEC, Yokohama, Japan, (7)University of Tokyo, Bunkyo-ku, Japan, (8)Univ of Tokyo, Ocean Hemisphere Research Center, Tokyo, Japan, (9)Earthquake Research Institute, The University of Tokyo, Tokyo, Japan
 
Sound velocity measurements on hcp-FeHx (x<1) under high pressures by femtosecond pulse laser pump-probe technique (513912)
Tatsuya Wakamatsu1, Kenji Ohta1, Shoh Tagawa2, Takashi Yagi3, Kei Hirose2,4 and Yasuo Ohishi5, (1)Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan, (2)The University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan, (3)AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, (4)Earth-Life Science Institute, Meguro, Japan, (5)Japan Synchrotron Radiation Research Institute, Hyogo, Japan
 
Electrical resistivity saturation in hcp Fe-Si alloys at high P-T conditions (513937)
Hayato Inoue1, Sho Suehiro1, Kenji Ohta1, Kei Hirose2,3 and Yasuo Ohishi4, (1)Tokyo Institute of Technology, Department of Earth and Planetary Sciences, Tokyo, Japan, (2)Earth-Life Science Institute, Meguro, Japan, (3)The University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan, (4)Japan Synchrotron Radiation Research Institute, Hyogo, Japan
 
Limited exsolution of SiO2 from the core over the past 4.5 Ga (518268)
Bruce A Buffett, University of California Berkeley, Earth and Planetary Science, Berkeley, CA, United States and James Badro, Institut de Physique du Globe de Paris, Paris, France
 
Hints of an Eoarchean magnetic field from the Isua Supracrustal Belt, Greenland (521049)
Claire I O Nichols, Massachusetts Institute of Technology, Cambridge, MA, United States, Benjamin P Weiss, MIT, Earth, Atmospheric and Planetary Sciences, Cambridge, MA, United States, Adam C Maloof, Princeton University, Department of Geosciences, Princeton, NJ, United States, Athena Eyster, Harvard University, Cambridge, MA, United States, Tim Greenfield, Bullard Laboratories, Cambridge, United Kingdom, Jahandar Ramezani, MIT-EAPS, Cambridge, MA, United States, Michael J Zawaski, University of Colorado at Boulder, Boulder, United States, Nigel M Kelly, Colorado School of Mines, Golden, CO, United States, Stephen J Mojzsis, University of Colorado & Universite Lyon 1, Boulder, CO, United States, Bruce Watson, Rensselaer Polytechnic Institute, Troy, NY, United States and Daniele J Cherniak, Rensselaer Polytechnic Inst, Troy, NY, United States
 
Sharpness of the hemispherical boundary in the inner core beneath the northern Pacific (532069)
Hitoshi Kawakatsu1, Ryohei Iritani2 and Nozomu Takeuchi1, (1)Earthquake Research Institute, The University of Tokyo, Tokyo, Japan, (2)Earthquake Research Institute, The University of Tokyo, Yayoi, Japan
 
Ab initio molecular dynamics investigation of molten Fe-Si-O in Earth’s core (537137)
Dongyang Huang1, James Badro1, John Peter Brodholt2 and Yunguo Li3, (1)Institut de Physique du Globe de Paris, Paris, France, (2)Univ College London, London, United Kingdom, (3)University College London, London, United Kingdom
 
Phase stability and thermal equations of state of Fe3S and Fe2S polymorphs to Earth’s core pressures and high temperatures (544274)
Claire Christine Zurkowski1, Nigel Brauser2, Eran Greenberg3, Vitali B Prakapenka3 and Andrew Campbell2, (1)University of Chicago, Geophysical Sciences, Chicago, IL, United States, (2)University of Chicago, Chicago, IL, United States, (3)University of Chicago, Center for Advanced Radiation Sources, Chicago, IL, United States
 
Mantle-Induced Regional Stratification at the Top of Earth's Core (Invited) (546284)
Jonathan E Mound, Earth and Environment, University of Leeds, Leeds, United Kingdom and Christopher J. Davies, University of Leeds, Leeds, United Kingdom
 
Regional Variation of Fine-Scale Structure of Earth's Inner Core (548143)
Guanning Pang, University of Utah, Salt Lake City, UT, United States, Sin-Mei Wu, University of Utah, Department of Geology and Geophysics, Salt Lake City, United States, Keith D. Koper, University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States and Garrett G Euler, Los Alamos National Laboratory, Los Alamos, NM, United States
 
Probing the Inner Core using near-vertical PKIIKP and frequency dependent amplitude ratio of PKiKP/PcP (551629)
Hao Hu, University of Houston, Earth and Atmospherical Sciences Dept, Houston, TX, United States, Yingcai Zheng, University of Houston, Earth and Atmospheric Sciences, Houston, TX, United States and Vernon F Cormier, University of Connecticut, Storrs, CT, United States
 
The Inner Core Boundary Beneath East Asia Constrained by Pre-critical PKiKP and PcP Phases (562160)
Haodong Zhang1,2, Yinshuang Ai1,3 and Yumei He1,3, (1)Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, (2)University of Chinese Academy of Sciences, Beijing, China, (3)CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China
 
New Constraints on Earth’s Inner Core Attenuation from Amplitude Information in the Global Correlation Wavefield (562207)
Thanh-Son Pham and Hrvoje Tkalcic, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia
 
Inner core crystallization through the F-layer as a constraint for core composition (563117)
Irene Bonati, Tokyo Institute of Technology, Rome, Italy, Marine Lasbleis, ELSI, Tokyo, Japan, John W Hernlund, Earth-Life Science Institute, Meguro, Tokyo, Japan and Kei Hirose, Tokyo Inst Tech, Tokyo, Japan
 
Anisotropy at the inner core boundary (566732)
George R Helffrich, Tokyo Institute of Technology, Earth-Life Science Institute, Tokyo, Japan and David Mainprice, CNRS, MONTPELLIER cedex 05, France
 
High Pressure Thermodynamics of fcc and hcp Phase Boundaries in Iron-Nickel Alloys (566976)
Nigel Brauser and Andrew Campbell, University of Chicago, Chicago, IL, United States
 
Electrical and thermal conductivity of Fe alloys at Earth’s core conditions and the evolution of the geodynamo (567496)
Youjun Zhang, Sichuan University, Chengdu, China, Mingqiang Hou, Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, United States, Peter Driscoll, Carnegie Institution for Science Washington, Washington, DC, United States, Nilesh Salke, HPSTAR, Beijing, China and Jung-Fu Lin, The University of Texas, Austin, Department of Geological Sciences, Jackson School of Geosciences, Austin, TX, United States
 
Flat and Sharp Earth’s Inner Core Boundary Beneath Mid-Eastern China Determined by PKiKP Spectrum Fitting (567661)
Xin Zhang, University of Science and Technology of China, Laboratory of Seismology and Physics of Earth's Interior & School of Earth and Space Sciences, Hefei, China and Lianxing Wen, State University of New York at Stony Brook, Department of Geosciences, Stony Brook, United States
 
Insights on Inner-Core Anisotropy Obtained from the Earth’s Correlation Wavefield (568475)
Thuany Costa de Lima1, Hrvoje Tkalcic1 and Lauren Waszek1,2, (1)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, (2)New Mexico State University, Las Cruces, NM, United States
 
Melting in the Fe-O-H system at 40 GPa (568863)
Kenta Oka, University of Tokyo, Bunkyo-ku, Japan, Kei Hirose, Tokyo Inst Tech, Tokyo, Japan, Shoh Tagawa, The University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan and Yasuo Ohishi, Japan Synchrotron Radiation Research Institute, Hyogo, Japan
 
Non-steady Slow Rotation of the Inner Core from Repeating Earthquakes (571544)
Yi Yang1 and Xiaodong Song1,2, (1)University of Illinois at Urbana Champaign, Geology, Urbana, IL, United States, (2)Peking University, Beijing, China
 
Observations of PKKPab Diffraction Waves Well Beyond Cutoff Distance (573418)
Yulin Chen, Wuhan, China, Sidao Ni, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan,Hubei, China and Baolong Zhang, University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China
 
Mutual Exclusivity between Si and H in Solid Iron under High Pressure (575793)
Koutaro Hikosaka1, Kei Hirose1,2 and Shoh Tagawa1, (1)The University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan, (2)Earth-Life Science Institute, Meguro, Japan
 
Influence of core electrical conductivity on core flow models in a tangentially magnetostrophic state (576205)
Masaki Matsushima, Tokyo Institute of Technology, Tokyo, Japan
 
High-Precision Equation of State Measurements Using Microfabricated Materials (583098)
Joshua Frederick Martin, Ohio State University Main Campus, Columbus, OH, United States, Jeffrey S Pigott, Los Alamos National Laboratory, Los Alamos, NM, United States, Blake T Sturtevant, Los Alamos National Laboratory, Los Alamos, United States, Yue Meng, HPCAT, X-Ray Science Division, Argonne National Laboratory, Argonne, United States and Wendy R Panero, Ohio State University, Columbus, OH, United States
 
Thermochemical Stratification Beneath the Core Mantle Boundary from Coupled Core and Mantle Thermal History Models. (602853)
Sam Greenwood, University of Leeds, Leeds, LS2, United Kingdom, Christopher J. Davies, University of Leeds, Leeds, United Kingdom and Jonathan E Mound, Earth and Environment, University of Leeds, Leeds, United Kingdom
 
In situ strength measurement of shock-compressed iron via time-resolved X-ray diffraction (619991)
Sovanndara Hok1, Arianna E Gleason1, Cynthia Bolme2, Dylan Rittman3, Sebastien Merkel4, Kyle James Ramos2, Benjamin Morrow2, Hae Ja Lee5, Bob Nagler5, Eric Galtier5, Eduardo Granados6, Akel Hashim7 and Wendy L Mao8, (1)Stanford University, Stanford, CA, United States, (2)Los Alamos National Laboratory, Los Alamos, NM, United States, (3)Stanford University, Geological Sciences, Palo Alto, CA, United States, (4)Université de Lille, Villeneuve d'Ascq, France, (5)SLAC National Accelerator Laboratory, Menlo Park, CA, United States, (6)CERN European Organization for Nuclear Research, Geneva, Switzerland, (7)University of California Berkeley, Berkeley, CA, United States, (8)Stanford-Geological & Env Sci, Stanford, CA, United States
 
Constraints on Inner Core Composition from the High-Pressure Sound Velocities and Thermal Equations of State of Fe-Si and Fe-Ni-Si Alloys (620096)
Eric Edmund1, Daniele Antonangeli2, Frederic Decremps2, Francesca Miozzi2, Guillaume Morard2, Eglantine Boulard3, Alisha N Clark4, Simon Ayrinhac2, Michel Gauthier5 and Mohamed Mezouar6, (1)CNRS - Sorbonne Universités, IMPMC, Paris, France, (2)Sorbonne Université - MNHN - CNRS - IMPMC, Paris, France, (3)IMPMC, Institut de Minéralogie et de Physique des Milieux Condensés, Paris, France, (4)Northwestern University, Evanston, United States, (5)Sorbonne Université - MNHN - CNRS - IMPMC, IMPMC, Paris, France, (6)IMPMC - CNRS - Sorbonne Universités, Paris, France
 
A constraint on shear velocity at the top of inner core from PKIIKP/PKIKP amplitude ratios at antipodal distances (623900)
Xiaodong Song, University of Illinois at Urbana-Champaign, Urbana, United States; Peking University, Beijing, China and Wenshuang Wang, Wuhan University, Wuhan, China
 
Geodynamo origin to inner core growth: Core chemical evolution traced by paleomagnetism (625252)
John Anthony Tarduno, University of Rochester, Earth and Environmental Sciences, Rochester, NY, United States, Rory Danielle Cottrell, Univ of Rochester, Earth and Environmental Sciences, Rochester, NY, United States, Richard K. Bono, University of Liverpool, Liverpool, L69, United Kingdom and Francis Nimmo, University of California-Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States
 
Influences of the inner spherical boundary on the bottom-up type convection at the onset in a rotating spherical shell (626184)
Hinami Taniguchi1, Futoshi Takahashi1, Shin-ichi Takehiro2 and Hisayoshi Shimizu3, (1)Kyushu University, Fukuoka, Japan, (2)Kyoto University, Kyoto, Japan, (3)Univ Tokyo, Tokyo, Japan
 
Reconciliation of Seismic and Mineral Physics Constraints (631523)
Miaki Ishii, Harvard University, Earth and Planetary Sciences Department, Cambridge, MA, United States and Brent G Delbridge, Harvard University, Cambridge, MA, United States
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