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在西北太平洋海底,进行地震仪台阵观测中发现,在震中距大约15°附近,岩石圈的P波走时消失(83年春季地震学会讲演)。这种走时的不连续性是岩石圈向软流圈迁移所致。震中距表示开始迁移的深度,振幅变化的形式取决于速度分布的形式。考虑到这一点,对地盾带、造山带、日本岛弧、老海洋底地区(马里亚纳海盆、西北太平洋海盆),调查岩石圈—软流圈迁移的地区特性(见图)。
In the seabed of the western North Pacific, an observation of the seismograph array found that the P-wave travel of the lithosphere disappeared near the epicenter about 15 ° (Spring Seismological Society lecture 83). This time-travel discontinuity is due to the migration of lithosphere to asthenosphere. The epicentral distance indicates the depth at which migration begins, and the form of the amplitude change depends on the form of velocity distribution. With this in mind, investigate the regional characteristics of the lithosphere-asthenosphere migration (Figure) for the shield belt, orogen, the Japanese island arc, the old ocean bottom (the Mariana Basin, the Pacific Northwest Pacific Basin).