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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Groundwater pressure changes and crustal deformation before and after the 2007 and 2014 eruptions of Mt. Ontake

Fig. 4

Daily observation results for January 2006 to April 2015. Seismicity values are for earthquakes at depths shallower than 3 km just under Mt. Ontake. M is earthquake magnitude by JMA. The corrected groundwater pressure at GOT is expressed as water head. The dotted square indicates the period in summer 2014 when the groundwater pressure sensor was not functioning properly. The groundwater pressure sensor was replaced on October 8, 2014, after the 2014 eruption had started (indicated by the arrow labeled SC). The groundwater pressure after sensor replacement was shifted slightly lower. Tohoku EQ is the 2011 Tohoku earthquake (M 9)

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