Shin’ichi Sakai

Learn More
1Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine, Tsukuba, Ibaraki 305-0052, Japan 2Institute of Seismology and Volcanology, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sappopro 060-0810, Japan 3Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan 4Research Center for Prediction(More)
This report presents a new method of separating H2, CO, CH4, C2H2, C2H4, and C2H6 dissolved in transformer oil and detecting H2, CO, and CH4, in which a tetrafluoroethylene-perfluoroalkylvinylether copolymer membrane is used to separate gases from the oil. The quantities of H2, CO, and CH4 that permeated through the membrane were relatively large. These(More)
In the present study, we analyze the seismic signals from a continuous volcanic tremor that occurred during a small phreatic eruption of the Hakone volcano, in the Owakudani geothermal region of central Japan, on June 29, 2015. The signals were detected for 2 days, from June 29 to July 1, at stations near the vents. The frequency component of the volcanic(More)
A freshwater discharge from a river is a crucial factor to understand water circulation and ecological system near the river mouth due to the changes of seawater density and the nutrient supply for the ocean. Therefore, water pollution such as red tide is strongly dependent upon the amount of water discharged from river and the pathways of them. It is clear(More)
Ariake Sound, in Kyushu Island of western part of Japan and connecting the small bay, Isahaya Bay, in the northwestern (Fig. 1) is strongly affected by large semidiurnal tide of which amplitude ranges from 3 to 5 m [3]. While Ariake Sound exhibits highly productive, red tides have occurred more frequently around the northern area of Isahaya Bay Mouth,(More)
  • 1