摘要
本文利用阿尔金地区的宽频地震数据,对布设在该区的10个宽频地震台站用接收函数方法进行了速度结构反演。反演的初步结果发现,若羌至花土沟剖面在20km深度处有一条厚度达5～10km的低速带断续出现,莫霍界面呈台阶状展布,北部浅,南部深;塔里木盆地南缘的地壳厚度为40～42km左右;在阿尔金南、北缘断裂两侧台站下方莫霍深度的错断约6.5～8km,在柴达木盆地北缘,莫霍面的深度达50km以上,S波速为4.5km/s。
Inversion on velocity structure was conducted applying the receiver function to the data from 10 of the broad-band teleseismic stations deployed in the Altun area. The tentative results show an intermittent low-velocity zone 5-10 km thick at a depth of around 20 km along the Ruo-qiang-Huatugou profile. The Moho is step-like, being shallow in the north and deep in the south. The crustal thickness is 40-42 km in the southern Tarim Basin. A drop of 6. 5-8 km in Moho depth is present beneath the stations on the sides of the Altun south-margin and north-margin faults, while the Moho depth beneath the northern margin of the Qaidam basin is up to over 50 km with an S wave velocity of 4. 5 km/s.
出处
《地质论评》
CAS
CSCD
北大核心
1999年第2期120-124,共5页
Geological Review
关键词
阿尔金地区
宽频地震
地壳结构
地震
震相
Altun area
broad-band teleseismic
receiver function
crustal structure
