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1985年6月19日,使用新型潜水艇探查海底“地震之巢”的日法联合“海沟计划”勘查团,在其停泊地静冈县清水市,发表了第一次航海调查结果,提出了远州滩近海南海海槽附近很少发现断层的海底,“很可能就是东海大地震的震源”的判断。这个海域是菲律宾海板块向西北方向俯冲到日本列岛之下的地方,它位于天龙川河口延长线上的天龙海底谷的东侧,水深3,400米。这里是在数十年以前的地震破碎岩石上,覆盖了一层薄泥层,情况与同一海
On June 19, 1985, the Japanese-French joint “Trench Project” exploration mission to explore the seabed “Earthquake Nest” using a new type of submarine issued its first survey of navigation results at its anchorage, Shimizu, Shizuoka Prefecture, Yuanzhou Beach near the South China Sea trough seldom found faults, “probably is the source of the East China Sea earthquake” judgment. This sea area is a subduction of the Philippine Sea plate to the northwest under the Japanese archipelago. It is located on the east side of the Denon Sea Valley on the extension of the Tian Longchuan estuary with a depth of 3,400 meters. Here is a few decades ago the earthquake crushed rock, covered with a thin layer of mud, the situation with the same sea