University of Tokyo Graduate School of Science
Earthquake Research Institute, University of Tokyo
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
雑誌名
第36回月・惑星シンポジウム
雑誌名(英)
Proceedings of the 36th ISAS Lunar and Planetary Symposium
ページ
61 - 64
発行年
2003-11
抄録（英）
Voyager and Galileo images demonstrate that most of the major icy satellites have the extensional tectonic features. It has been thought that such tectonic features formed due to the surface extensional stress. In various sources of stress considered, contribution of the stress due to volume change accompanied by phase change is greatly important. In the icy satellites, solidification of the liquid water layer induces a large volume change, and for example, volume change rate due to the phase change from liquid water to low-pressure ice is about + 10 percent. In this paper, the Jovian satellite Europa has been focused on where only phase change to low-pressure ice occurs, and the stress has been evaluated numerically in the ice shell due to phase change. It is shown that the resulting stress exceeds the extensional strength of ice, and the surface fracturing can occur.
The stress state in a growing ice shell and the possibility of surface fracturing event of the icy satellites
