论文部分内容阅读
到目前为止,已经在太平洋水域的700多处进行了深部地震探测.由此建立了洋壳速度模式(表1,略),按照现代观点.可以将太平洋洋壳划分成三层:第一层,或者叫沉积层,其弹性振动传播速度为1.7-2.0km/s. 平均厚度为2.0-0.3km;第二层,弹性振动传播速度为2.5-6.0km/s.平均厚度为1-2km;第三层,弹性振动传播速度为6.5-7.7km/s.平均厚度为4-5km.第二层和第三层又可以划分出以下几
To date, deep seismic surveys have been conducted at more than 700 locations in the Pacific Ocean, thus establishing a velocity pattern for the oceanic crust (Table 1, omitted). From a modern point of view, the Pacific Ocean can be divided into three layers: the first , Or deposition layer, the elastic vibration propagation velocity of 1.7-2.0km / s. The average thickness of 2.0-0.3km; the second layer, elastic vibration propagation velocity of 2.5-6.0km / s. The average thickness of 1-2km; The third layer, the elastic vibration velocity of 6.5-7.7km / s. The average thickness of 4-5km. The second and third layers can be divided into the following