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气枪激发条件对气枪信号及走时变化的影响研究
向涯1, 杨润海2, 王彬2, 周云耀1, 吕永清1, 吴欢1, 马鑫1, 齐军伟1, 彭警1
1.中国地震局地震研究所,中国地震局地震大地测量重点实验室;2.云南省地震局
摘要:
气枪震源激发条件的改变能够引起气枪信号的细微变化,常常使得气枪信号走时变化中混入震源变化信息,不能完全反映介质的演变过程。本文利用宾川气枪震源激发数据,分析了不同激发条件下气枪信号的相位及相关性特征,对台差法和反褶积法在消除走时变化中激发条件的影响的效果上进行了对比分析。结果表明:(1)气枪子波压力脉冲及其反射波相位受激发条件影响较小,可利用其进行互相关以获取高精度的激发时刻;(2)反褶积运算可以提升气枪信号的相关性;(3)台差法不能消除走时变化中的激发条件影响,反褶积法可以减小激发条件干扰,垂向分量信号反褶积后走时变化中的激发条件影响明显减小。
关键词:  气枪震源  台差法 反褶积  走时变化 互相关
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Study on the influence of air-gun excitation conditions on air-gun signal and travel time variation
xiangya1, yangrunhai2, wangbin2, zhouyunyao1, lvyongqing1, wuhuan1, maxin1, qijunwei1, pengjing1
1.Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration;2.Yunnan Earthquake Agency
Abstract:
Because of the different excitation condition of the air-gun source, there will be subtle differences in the air-gun signals. And the travel time variation of air-gun signal often mixes into source information which can’t fully reflect the evolution of the medium. This article uses the air-gun signal of Binchuan Transmitting Seismic Station to analyze the air-gun signal’s characteristic of phase and correlation. We conducted a comparative analysis of the effects of the pair difference method and the deconvolution method on eliminating the influence of the excitation conditions in the travel time variation. The results show that:(1)The pressure pulse and its reflection wave of air-gun source wavelet are less affected by excitation conditions, we can use it to obtain high-precision excitation moments. (2)Deconvolution can improve the correlation of air-gun signal. (3)Pair difference method can’t eliminate the influence of excitation conditions in the travel time variation. Deconvolution can reduce excitation condition interference and the influence of the excitation condition in the travel time variation after deconvolution of the vertical signal is significantly reduced.
Key words:  Air-gun source  Pair difference  Deconvolution  Travel time variation  Correlation