【摘要】 时间项分析法中 ,应用广义最小二乘法进行反演 ,对长白山天池火山区岩浆系统的长白—敦化 (L1)剖面的Pg波到时进行了计算处理 ,得到了Pg波时间项及基底速度值 ;取上部地壳的介质平均速度为 4 5km/s ,经反演求得了各点的深度值 ,给出了长白山天池火山区结晶基底的厚度分布。结晶基底厚度一般在 2 0km左右 ,而在长白山天池下方结晶基底最厚处接近 4 0km ;在万宝和敦化附近各有一不太明显的凹陷 ,其原因可能与在这两个位置处有几条断裂穿过有关。更多还原

【Abstract】 Using Generalized Least Squares Criterion in the time term inversion,the velocity of basement is obtained by the computation to the Changbai-Dunhua profile in the Tianchi volcanic region of Mt.Changbaishan.The average velocity of upper crust which is selected is 4.5km/s.Thus the depth of each point is obtained.The results show that the thickness of the bottom is 2.0km or so in this region.But it is up to 4.0km under the Tianchi and it thickens in Wanbao and Duuhua region,because it is the place where many fault zones cross.更多还原