Interface inversion using broadside seismic refraction data and three‐dimensional travel time calculations
Interface inversion using broadside seismic refraction data and three‐dimensional travel time calculations
复制标题
使用侧面地震折射数据和三维走时计算进行界面反演
DOI：
10.1029/91jb02858
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发表时间：
1992
影响因子：
--
通讯作者：
R. Ellis
中科院分区：
文献类型：
--
作者：
J. Hole;R. Clowes;R. Ellis
已经开发了一种方法来解释从大型气枪阵列中记录的密集采样的宽边地震折射数据。首先到达旅行时间是倒置的，以在射击线下方的界面上找到结构。使用快速有限的差异算法计算三维速度模型的旅行时间，该算法适用于模型的可变采样和射线测定。简单的反转参数化消除了对矩阵反转的需求。完整的反转过程在计算上很快，但允许确定详细的三维结构。在多通道反射实验中，在加拿大夏洛特皇后盆地记录的宽边折射数据用于演示该程序。数据倒在射击线下方的地下室界面，定义了迅速变化的沉积盆地填充厚度。反演的结果刺激了反射数据的重新解释，并确定了新的主要地下室故障。确定反射部分平面的结构，包括断层的打击和其他附近的特征。
A procedure has been developed to interpret densely sampled broadside seismic refraction data recorded from a large air gun array. First arrival travel times are inverted to find the structure on an interface beneath the shot line. Travel times are calculated for three-dimensional velocity models using a rapid finite difference algorithm, adapted to allow variable sampling of the model and the determination of rays. A simple inversion parameterization eliminates the need for matrix inversion. The complete inversion procedure is computationally rapid yet allows the determination of detailed three-dimensional structure. Broadside refraction data recorded in the Queen Charlotte Basin, offshore western Canada, during a multichannel reflection experiment are used to demonstrate the procedure. The data are inverted for the basement interface beneath the shot line, defining a rapidly varying thickness of sedimentary basin fill. The results of the inversion stimulate a reinterpretation of the reflection data and identify a new major basement fault. Structure out of the plane of the reflection section is determined, including the strike of the fault and other nearby features.