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马鞍山-铜陵-安庆长江沿线上地壳速度结构成像
田晓峰 王夫运 刘宝峰 杨卓欣 郑成龙 高占永
中国地震局地球物理勘探中心,郑州市文化路75号 450003
摘要:
利用安徽人工震源地下结构探测科学实验开展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成像结果。结果显示,沿长江从马鞍山至安庆,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。
关键词:  人工震源  气枪  三维地震成像  观测系统
DOI:
分类号:
基金项目:
Upper crustal velocity structure along the Yangtze River from Ma’ anshan to Anqing
Tian Xiaofeng, Wang Fuyun, Liu Baofeng, Yang Zhuoxin, Zheng Chenglong, and Gao Zhanyong
Geophysical Exploration Center, China Earthquake Administrator, Zhengzhou 450003, China
Abstract:
We applied the 3D first arrival travel time tomography method to the Anhui active seismic source experiment data, and obtained the imaging of the upper crust velocity structure beneath the Yangtze River from Ma’anshan, Tongling to Anqing. Data fitting reveals the tomographic model fits the data with uncertainties, without overfitting, and with a minimum of complexity. The tomographic result shows an obvious heterogeneous upper crust which consists of a series of uplifts and depression basins. The velocity model and region imply that this region has experienced crustal uplift and extensional tectonism with concomitant magmatism since the Cenozoic.
Key words:  Seismic active source  Airgun 3D seismic tomography  Survey geometry