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Fig. 7 | Earth, Planets and Space

Fig. 7

From: Source constraints for the 2015 phreatic eruption of Hakone volcano, Japan, based on geological analysis and resistivity structure

Fig. 7

Examples of CSAMT data from 2008 (black) and 2018 (orange) surveys at four locations on survey line Fa. Apparent resistivity (upper panel) and phase angle (lower panel) data are displayed as a function of the frequency at receiver Stations H07, H31, H38, and H41. H07 represents the stations above the conductive Region U. H31 and H38 represent the stations above the resistive Region P presented in Fig. 5. A significant change can be observed between the data from 2008 to 2018 at Stations H07, H31, and H38. Conversely, no significant change can be observed at H41. The slight increase in resistivity in the range of 10–100 Hz in H31 and H38 (arrow) indicates the existence of the shallow resistive Region P

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