高精度地震纯波震源数值模拟

为了提高纵波震源和横波震源计算机数值模拟的精度，提出了高阶高精度纯纵波震源和纯横波 震源的网格配置方法，对比分析了多种震源网格配置方案，从理论上分析了新震源配置方法的准确性。通 过对各向同性弹性介质复杂模型波场分离的数值试算，指出常规纯波震源的设置方法存在阶数较低和残 留波场等问题。改进后的仿真结果所引入的干扰波场能量较弱，数值模拟精度较高，因此，该方法能够再 现野外纵波震源和横波震源的地震勘探模拟，并可以观测到利用常规数值模拟方法难以获得的特殊波 场，有利于地震波波动理论的验证和完善，可用来指导地震资料的采集、处理和解释。

Numerical simulation of high accuracy seismic pure wave source

In order to improve the numerical simulation precision of the compression wave source and shear wave source by computer, this paper put forward the grid setting method of high-order high accuracy pure compression wave and shear wave source, compared with many source grid setting proposals, and further validated it by the theory. The wave field separation numerical experiments on the isotropic elastic medium complex models were carried out, and the result shows that the setting method of traditional pure wave source has problems of low order and residual wave field. While the proposed method is with little disturbing wave field and perfect numerical simulation accuracy, which can not only achieve the goal of reappearing the seismic prospecting with the compression wave source and shear wave source, but also observe the special wave fields which are unclear with traditional numerical method. Therefore the proposed method is in favor of verifying and perfecting the seismic wave dynamic theory, and can guide the seismic acquisition, seismic processing and seismic interpretation.