tsunaga 1 , M. Ohtake 2 , J. Haruyama 2 , S. Yamamoto 1 , Y. Ogawa 3 , R. Nakamura 4 , Y. Yokota 2 , T. Morota 2 , C. Honda 3 , M. Abe 2 , T. Nimura 2 , T. Hiroi 5 , T. Arai 6 , K. Saiki 7 , H. Takeda 8 , N. Hirata 3 , S. Kodama 4 , T. Sugihara 9 , H. Demura 3 , N. Asada 3 , J. Terazono 3 , and H. Otake 10 , 1 Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa Tsukuba 305-8506, Japan, 2 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3 The University of Aizu, 4 Information Technology Research Institute, National Institute of Advanced Industrial Science and Technology, 5 Department of Geological Sciences, Brown University, 6 Chiba Institute of Technology, 7 Department of Earth and Space Science, Osaka University, 8 The University of Tokyo, 9 Center for Deep Earth Exploration, Japan Agency for Marine Science and Technology, 10 Lunar and Planetary Exploration Program Group, Japan Aerospace Exploration Agency. Contact : matsunag@nies.go.jp