迄今为止,在太平洋海域已知有700多个点进行过深部地震测深。这些测量使得编制出地壳速度模型(表1)。按现代的观点,太平洋洋壳可分为三层:第一层或沉积层,其弹性波传播速度为1.7-2.0千米/秒,平均厚度为200-300米;第二层的速度为2.5-6.0千米/秒,平均厚度1000-2000米;第三层的速度为6.5-7.7千米/秒,厚度4000- To date, more than 700 points of deep seismic sounding have been known in the Pacific Ocean. These measurements led to the development of a crustal velocity model (Table 1). From a modern point of view, the Pacific Ocean can be divided into three layers: the first layer or sediment, the elastic wave propagation velocity of 1.7-2.0 km / s, the average thickness of 200-300 meters; the second layer of the speed of 2.5 -6.0 km / s, the average thickness of 1000-2000 m; the third layer of the speed of 6.5-7.7 km / s, the thickness of 4000-