桜島火山北東部の表層地震反射構造

概要

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Shallow seismic reflection structure down to 2km b.s. 1. in Sakurajima Volcano is presented with an application of Pseudo-Reflection profiling. Data used in this study are obtained through a controlled source seismic experiment, the 2008 Sakurajima project. Two final profiles are obtained after the processing for the lines NS and EW. Prominent reflective horizons can be recognized in shallow part of the both profiles. Complicated pattern of the reflection horizons is correlated as a cross section of piled-up lava flows. Thicknesses of the historical lava flows are recognized and some unknown lava flows are also detected in both profiles. However, less reflective zone appear in 100 to 800m b.s. 1. in the profile. The less reflective zone is inferred as pyroclastic materials from underwater eruptions because the zone corresponds to the low resistive layer in the resistivity profile. These results can be contributed to discuss evolution history and explosion mechanisms.
2011-12-31