Studies on the therma I structure and the water distributi on in the Pacific plate subducting along the Japan Trench

我们发现日本海沟北部向海斜坡的热流在海底时代异常高。高热流只在太平洋板块因俯冲而变形的地区观察到。这可能与洋壳正断层发育和热液循环有关。我们利用人工控制的电流成功地对太平洋板块高热流区海底以下浅层进行了电磁测量。结合深部自然源电磁测量结果，可以获得该区域内孔隙流体的动态变化信息。

We revealed that heat flow on the seaward slope of the northern Japan Trench is anomalously high for the seafloor age. The high heat flow is observed only in the area where the Pacific plate has been deformed associated with subduction. It may be related to development of normal faults and hydrothermal circulation in the oceanic crust. We successfully conducted electromagnetic survey of shallow layers just below the seafloor in the high heat flow area on the Pacific plate using artificially controlled electric current. Combined with the results of natural-source electromagnetic survey of deeper part, we could obtain information on pore fluid rli ctrihntinn in tha cnhrlnntinu nnoanin nrnct.