Session 4 Geophysics

Meryem Berrada (Earth Scien., U. Western Ontario), Richard A. Secco & Wenjun Yong
Mercury Heat Flow in an Fe8.5Si and Fe10Ni10Si Core

Innocent Ezenwa (Earth & Planet. Scien., Carnegie Inst. for Scien.) & Takashi Yoshino
Electrical resistivity and thermal conductivity of the transition metals at high P: Resistivity measurement techniques and results

Joshua Littleton (Dep. Earth Scien., Western U.), Richard A. Secco & Wenjun Yong
Permissible Thermal Convection in the Core of Ganymede from Electrical Resistivity of FeS and Fe-FeS

Shun-ichiro Karato (Earth & Planet. Scien., Yale U.), Reynold Silber, Jennifer Girard & Lidong Dai
How should we study rheological properties of the deep Earth?

Comments: 2
  • #2 (Saturday, 09 October 2021 15:59)

    Here is the answer to the questions by Yuichiro Mori.
    His question is how can we apply the flow laws determined in the lab (at the lab strain-rate) to actual Earth where strain-rate is much slower. This is an important question, and the answer is that one needs to make a scaling analysis to extrapolate in strain-rate. Obviously, this leads a very large uncertainties and one must use a combination of various approaches.
    Details on scaling are explained in my textbook, Karato (2008) as well as a Japanese textbook 地球物質のレオロジーとダイナミックス(2011).

  • #1

    MORI Yuichiro (Saturday, 25 September 2021 18:24)

    Professor Karato,
    I'm sorry for asking a question that is not directly related to this.
    What is the essential connecting the flow raw data from the lab with the dynamics of mantle or inner core?
    It seems to me that we can reproduce the dynamics in the laboratory or in calculations by using dimensionless number such as Rayleigh Number. However, I' m not sure that how can we apply the results of such rheological experiments under high pressure to the actual Earth under high pressure or ultra high pressure like inner core?

    Yuichiro Mori (audit student in a master's course of a graduate school)

Timothy Officer (CARS; U. Chicago), Man Xu, Tony Yu, Lupei Zhu, Yanbin Wang
Transformational faulting of centimeter-sized samples at HPHT combined with in-situ X-ray diffraction, radiography and acoustic emission monitoring