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Earth, Planets and Space
Fig. 14 | Earth, Planets and Space

Fig. 14

From: Solidified magma reservoir derived from active source seismic experiments in the Aira caldera, southern Kyushu, Japan

Fig. 14

Map depicting the distribution of earthquakes in and around the Aira caldera. Blue and red circles indicate volcano-tectonic (VT) and low-frequency (LF) earthquakes detected between 2000 and 2019 (data acquired from the Japanese-unified hypocenter catalog by the Japan Meteorological Agency). In (a), large and small circles drawn with a black broken line indicate the locations of the HVZ (high velocity zone) and the deep LVZ (low velocity zone) estimated in this study. Cross symbols denoted by “A”, “K” and “M” are the pressure source-A, -K, and -M, respectively, as estimated by Hotta et al. (2016). Red straight line indicates the projection profile in the tomography; whereas the red broken arrow line describes a theorized magma transport path. In (b), the green hatched zone delineates an aseismic region, while the deep LVZ is also presented. All other symbols are the same as those in (a)

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