摘要
利用甘肃省数字台网的资料,应用远震接收函数方法对各个台站下方的地壳结构进行了分析研究。研究结果表明,Moho面的深度都在50 km左右,甘南的Moho面深度普遍大于河西;地壳可以分为两层,20 km为其分界面。上地壳普遍存在低速层,其成因不是岩石熔融所致,而是其它地球物理和地球化学因素所致。另外各台站下方地表盖层的速度也存在很大差异。
Using the method of receiver function, based on the data of digital seismic stations in Gansu province, the crustal structure beneath digital seismic stations in Gansu province is studied. The results indicate that the depth of Moho is about 50 km in the study area, and the Moho's depth of the southern Gansu is deeper than the western Gansu. The crust under Gansu province consists of two layers, the interface is at about 20 km. A low velocity layer is ubiquitous in upper crust, it formed not because the partial melting of rock but the geophysical and geochemical factors. Otherwise, the velocities of earth's surface are very different beneath different stations.
出处
《西北地震学报》
CSCD
北大核心
2008年第3期270-275,共6页
Northwestern Seismological Journal
基金
甘肃省地震局(所)青年地震科学基金资助课题(200705)
中国地震局地震预测研究所基本科研业务专项(691)
中国地震局兰州地震研究所论著编号:LC2008018
关键词
甘肃省
数字测震台
接收函数
地壳
速度结构
Gansu
Digital seismic station
Receiver function
Crust
Velocity structure