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利用大容量气枪激发数据对两种测量地壳介质波速变化方法的对比分析
云南省地震局
摘要:
概述从气枪震源事件中提取波速变化的方法,针对目前波速变化提取方法,提出将动态规划法应用于计算波速相对变化,以探讨其与当前的基于干涉的互相关延时估计法异同,其结果表明:①互相关法和动态规划法计算的波速变化变化趋势是一致的,表明互相关延迟法计算结果是可靠的;②相较于互相关延迟法计算结果,动态规划法计算结果表明其具有放大效应,对微小的扰动更为敏感 ;③理想情况下,利用P波、S波震相计算的波速变化趋势应当是一致的。此外,利用互相关延迟法计算波速变化,在条件合适的情况,可以观测到气枪震源邻近的M1.1地震发生前波速下降后回升的过程。
关键词:  人工震源,气枪震源,互相关,波速变化,动态规划
DOI:
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基金项目:
Velocity variation observed from airgun active source in regional scale
Ye
Office of the Western Yunnan Earthquake Prediction Study Area,China Earthquake Administration,Dali
Abstract:
This paper summarizes the methods of extracting velocity variation from airgun source events. Aiming at the current methods of extracting velocity variation, the dynamic programming method is applied to calculate relative variation of velocity. The similarities and differences between the dynamic programming method and the current interference-based cross-correlation time delay estimation method are discussed. The results show that: (1) the trend of velocity variation calculated by cross-correlation method and dynamic programming method is consistent, indicating that the cross-correlation time delay is the same. The results of delay method are reliable; 2) Compared with the results of cross-correlation delay method, the results of dynamic programming method show that it has amplification effect and is more sensitive to small disturbances; 3) Ideally, the variation trend of wave velocity calculated by P-wave and S-wave phases should be consistent. In addition, the cross-correlation delay method is used to calculate the wave velocity variation. When the conditions are suitable, the process of wave velocity recovery after the decrease of wave velocity before the M 1.1 earthquake near the air gun source can be observed.
Key words:  airgun ,wave speed varation,correlated detection, dynamic wave warping