Japan Geoscience Union Meeting 2016

Presentation information

Poster

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG58] Rheology, fracture and friction in Earth and planetary sciences

Sun. May 22, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tomohiro Ohuchi(Geodynamics Research Center, Ehime University), Osamu Kuwano(Japan Agency for Marine-Earth Science and Technology), Ichiko Shimizu(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Hidemi Ishibashi(Faculty of Science, Shizuoka University)

5:15 PM - 6:30 PM

[SCG58-P03] Large Scale High Precision Sand Box Experiments:
Precise Measurements of Precursory Signal Preceding to Frontal Thrust Formation

*Osamu Kuwano1, Takane Hori1, Hide Sakaguchi1, Daisuke Nishiura1, Mikito Furuichi1, Miki Yamamoto1, Yasuhiro Yamada1 (1.Japan Agency for Marine-Earth Science and Technology)

Keywords: precursor, earthquake, sandbox experiment

In order to find out the mechanism of the three-dimensional complex shape formation in sequential thrust and uplift of an accretion prism, we have developed a large-scale high precision sandbox experimental apparatus since 2011. After a number of modifications in the experimental apparatus and experimental procedure, we developed a prototype of the apparatus in 2014. In specimen preparation, the thickness of a sand layer is controlled with the precision of less than single particle size.
As a result, we obtained high reproducibility of the thrust formation including its position. With such a well-controlled experimental system, we found the precursory signal prior to thrust formation. In order to grab and understand the signal, we further improved the apparatus by installing the laser displacement sensor (resolution 0.1µm, span 800mm), a force sensor, and camera array for surface measurement. We will report the detailed information on the experimental apparatus our new findings.