Fig. 4From: Precursory tilt changes of small phreatic eruptions of Meakan-dake volcano, Hokkaido, Japan, in November 2008Displacement particle orbits during the gray-shaded period in Fig. 3. An arrow placed in each graph expresses the direction of trajectory. Dark- and light gray-colored triangles in each graph indicate azimuth directions of the 96-1 crater and that of the Pon-Machineshiri crater area from each station, respectively. It should be noted that a different scale is used for ONTBack to article page