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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...
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... addition, two vibroseis sources from four vibrator-vehicles were conducted at two xed points, the western end of Prole-A (referred to as the VA point) and the eastern end of Prole-C (referred to as the VC point), respectively. Figure 3 shows examples of the observed seismic waves, and Fig. 4 presents all travel-time data used in the present study. The rst P-wave arrivals with an onset uncertainty < ± 0.10 s were picked from all observed seismic waves. ...
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