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2011

● IFREE YES seminar
Place: IT-Wing, 4th-floor,Meeting Room, Yokohama Institute for Earth Sciences
Time: June 8(Wed) 14:00-15:30
Speaker: Takashi Nakagawa

Title: Effects of a stably stratified layer near the top boundary in numerical dynamo simulations in a rotating spherical shell: Implications for dynamics of Earth's core

Abstract: Abstract: For Earth's core, a stably stratified layer could be recently found by seismic wave analyses [e.g. Helffrich and Kaneshima, 2010] and forms by the light element release due to the inner core growth [Lister and Buffett, 1998] or chemical core-mantle interaction [Buffett and Seagle, 2010]. Several numerical dynamo simulations have investigated how a stratified layer affects the dynamics of convection in a rotating spherical shell [e.g., Christensen, 2006; Stanley and Mohammadi, 2008] but not for Earth's core dynamics. Here we introduce some interesting results found from numerical dynamo simulations in a rotating spherical shell with a stably stratified layer near the top boundary to imply how a stratified layer affects the dynamics in Earth's core with showing force balances and energy contributions as well as the influence to the polarity reversals varying with the degree of stratification.


● IFREE YES seminar
IFREE 1A&LP seminar
Place: 403&404 Meeting room, IT building, Yokohama Institute for Earth Sciences
Time: 14:00-17:00 on 25th, January (Tuesday)

Speaker1: Ayako Nakanishi
Title: Geometry of the Philippine Sea plate subducting beneath the southwestern Nankai Trough
-Progress report of structural study for Nankai Trough seismogenic zone -

Abstract: Sorry, no English abstract.


Speaker2: T. Yamaguchi and M. Doi (Department of Applied Physics, The University of Tokyo)
Title: Heterogeneous stick-slip motion in sliding friction of polymer gels

Abstract:
When a soft polymer gel is slid on a glass plate, it is known
that spatio-temporally heterogeneous stick-slip motions occur during
sliding. In this presentation, we will report our experimental results
on elementary processes, size distributions and size-duration relations
during sliding of the polymer gels. We will also discuss the relations
with earthquake phenomena.