马鞍山­铜陵­安庆长江沿线上地壳速度结构成像

Upper crustal velocity structure along the Yangtze River from Ma'anshan to Anqing

摘要:

利用安徽人工震源地下结构探测科学实验的三维高分辨探测数据，以及初至波走时成像技术，获得了沿长江一线上地壳速度结构的成像结果。结果显示，沿长江马鞍山-安庆，上地壳速度结构存在明显横向差异，沉积盖层厚度和浅表速度在该区呈现明显的隆升和坳陷相间的构造特征，显示了该区域中生代以来经历的隆升和伴随着岩浆活动的伸展作用。

Abstract:

We applied 3D first arrival travel time tomography method to the Anhui artificial seismic source experiment data，and obtained the imaging of upper crust velocity structure beneath the Yangtze River from Ma'anshan，Tongling to Anqing. Data fitting reveals the tomographic model fits the data within uncertainties，without overfitting，with a minimum of complexity. The tomographic result shows obviously heterogeneous upper crust which consists of a series of uplifts and depression basins. The velocity model implies this region has experienced crustal uplifts and extensions which was concomitant magmatic activity since the Cenozoic.