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本文利用中国数字地震台网的资料,对昆仑山—柴达木盆地—秦岭—大别山纬向构造带的地壳及上地幔构造进行了研究。沿这一构造带沉积层平均厚度为8km,剪切波速度β=2.62km/s,壳内平均速度较低,为3.5km/s左右,在下地壳还存在低速层。地壳平均厚度为48km,自东而西相差不很大。上地慢低速层在70—90km深处开始出现。这种构造特征有别于地台和高原,具有块体间的过渡性质,表明这是中国地壳块体中的一个独立构造单元。
In this paper, the crust and upper mantle structure of the latitudinal tectonic belt in the Kunlun Mountains-Qaidam Basin-Qinling-Dabie Mountains are studied by using the data of China Digital Seismic Network. The average thickness of the sedimentary layer along this tectonic belt is 8km, the shear wave velocity is β = 2.62km / s, the average velocity in the crust is low at about 3.5km / s, and low velocity layer exists in the lower crust. The average thickness of the crust is 48km, which differs little from east to west. Low-speed slow on the ground began to appear in the depths of 70-90km. This structural feature is different from the platform and the plateau and has the transitional character between blocks, indicating that it is an independent structural unit in the crustal block of China.