3D主动源地震折射/反射联合快速波前成像研究  

Joint Inversion of Active Source Seismic Refraction and Reflection Using Fast Marching Method for 3DStructure

作　　者：刘妍[1,2] 徐朝繁[2] 

机构地区：[1]中国地震局兰州地震研究所,兰州市东岗西路450号730000 [2]中国地震局地球物理勘探中心,郑州市文化路75号450002

出　　处：《大地测量与地球动力学》2015年第3期517-520,542,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40974033;41474075);中国地震局国际合作司东北亚地震;海啸和火山合作研究计划(ZRH2014-06);中国地震局地震行业专项(20130811)

摘　　要：基于深地震测深震相记录特征及最新发展起来的快速波前追踪方法,利用理论合成的3D主动源地震折射/反射数据,对强速度对比及复杂Moho结构的重建进行数值模拟计算。结果表明,折射震相Pg对上地壳细结构有较高的分辨,宽角反射震相PmP可较好地约束中下地壳及Moho界面的细结构特征,但对浅部结构的分辨力较差,折射和反射地震的联合成像可有效恢复深浅部3D空间的强速度对比结构及Moho界面形态特征。Based on the seismic phase record characteristics of Deep Seismic Sounding and the fast marching method which has been developed recently, numerical simulation of joint inversion of active source seismic re- fraction and reflection for 3D structure is given. The results show that the refraction phase Pg has higher res olution for fine upper crustal structures, and that the middle-lower crustal structure and complex Moho geom- etry can be well recovered with wide angle reflection phase ProP, although it has poor resolution for the shal- low structures. The joint inversion can effectively recover 3D velocity structure in any depth, with strong ve- locity contrasts and the morphological characteristics of Moho interface.

关 键 词：折射/反射地震 快速波前追踪 联合成像 3D探测 深部细结构 

分 类 号：P315[天文地球—地震学]