摘要
本文利用τ-p波场反演法直接对OBS原始数据进行转换,得到一维速度深度函数.该方法包含倾斜迭加和向下延拓两个线性转换:倾斜迭加将原始数据由时间偏移距域(t-x)转换为时间截距慢度域(τ-p);向下延拓将时间截距慢度域(τ-p)波场转换为深度慢度域(zp)波场.然后根据五个OBS台站得到的一维速度深度函数,合成东沙群岛地壳的二维速度结构模型.为了检验该速度结构模型,我们用拾取走时和利用模型计算的理论走时进行拟合,得到了满意的结果,从而为下一步进行层析成像提供了可靠的初始速度结构模型.
In this paper the inversion of τ-p wave field is adapted for OBS data in order to produce 1-D velocity-depth functions directly. The produce consists of two linear transformations. First, the data are transformed from t-x domain to τ-p domain by the slant stack; Second, the data of τ-p domain are transformed to z-p domain by downward continuation. According to the 1-D velocity-depth functions of five OBS, we synthesize the 2-D crustal velocity structure model of Dongsha islands. In order to check the 2-D velocity model, we fit between the observed and the calculated travel time. The results is satisfied and is preliminary model for tomography.
出处
《地球物理学进展》
CSCD
北大核心
2005年第2期503-506,共4页
Progress in Geophysics
基金
国家"863"计划(2003AA611010-01)资助.
关键词
倾斜迭加
向下延拓
走时拟合
速度深度函数
slant stack, downward continuation, traveltime fit, velocity-depth function
