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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Temporal variation in the resistivity structure of the first Nakadake crater, Aso volcano, Japan, during the magmatic eruptions from November 2014 to May 2015, as inferred by the ACTIVE electromagnetic monitoring system

Fig. 1

ACTIVE observation configuration and obtained responses. a Location of Aso volcano and ACTIVE system installed in May 2014 are shown. TRM and A01 to A04 indicate the transmitter and receivers, respectively. b In each panel, upper plots show amplitudes of the ACTIVE response and differences in percent from the values in May 2014, while lower plots depict phases and their differences in degrees from those in May 2014 again. The blue and red lines mean the responses before and after magmatic eruptions began on November 25, 2014, respectively. Only for the responses in August 2014 and August 2015, observation errors are drawn in gray. c Time variations of amplitude are plotted for 21 Hz and 61 Hz. The water amount of the crater lake (measured as the area ratio of the lake surface to the whole crater bottom) is plotted by blue dots (Japan Meteorological Agency 2016), where 100% means the lake surface covering the whole crater bottom

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