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Seismic exploration was conducted along a profile running through the Aira caldera located in southern Kyushu, Japan. The caldera was formed by an ignimbrite eruption approximately 30 ka BP, namely, the “AT eruption,” which produced the Ito ignimbrite and widespread Aira-Tanzawa ash. This analysis aimed to clarify the detailed P -wave velocity stru...
Contexts in source publication
Context 1
... seismic exploration along the 195 km-long E-W prole crossing southern Kyushu was conducted in 2017 and 2018, as shown in Fig. 2. The entire prole was composed of 6 subproles: Prole-A, -B, -C, -D, -E, and ...
Context 2
... this study, the locations of all stations, shots, and travel-time data were projected on a straight line that connected the easternmost station in Prole-A and the western end of the airgun sources in Prole-F (Fig. 2). First, the entire prole region (ranging from 0 to 195 km distance and − 1 to 60 km in depth) was divided into a 200-m square (hereafter, called the 200-m cell model), and the tomography was applied to all travel-time data. Second, to obtain a detailed structural image for the Aira caldera, tomographic analyses were conducted only for ...
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