Research on the true picture of magma supply system, which is supposed to be beneath the sea area, by means of the investigation of underground structure

为了弄清与假定的岩浆储层以及樱岛火山和海底火山的补给路径相对应的电阻率结构，自2009年以来，我们主要沿沿着两条穿越空拉破火山口的WNW-ESE方向的导线进行了大地电磁（MT）测量。在过去的四年中，共获得了44个站点的MT数据，其中包括16个海底站点。二维和三维反演的结果表明，从破火山口中部到东部，从下地壳沿着鹿儿岛地堑延伸出一个高导区。该导体可能是与岩浆供应系统有关的构造。

In order to clarify the corresponding electrical resistivity structure to the assumed magma reservoir and to the supply paths to Sakurajima volcano and to the submarine volcano, we have conducted the magnetotelluric (MT) measurement mainly along two traverse lines in the direction of WNW-ESE crossing the Aira caldera since 2009. The MT data at 44 sites in total, including 16 seafloor sites, were obtained for the last four years. As a result of 2-D and3-D inversions, a high conductive region extending from the lower crust along the Kagoshima graben was found from the central part of the caldera to the eastern part. This conductor is possibly the structure relevant to the magma supply system.