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Study on the Influence of Airgun Excitation Conditions on Airgun Signals and Travel Time Variation Measurements
XIANG Ya1, YANG Runhai2, WANG Bin2, ZHOU Yunyao1, LU Yongqing1, WU Huan1, QI Junwei1, PENG Jing1
1.Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, China;2.Yunnan Earthquake Agency, Kunming 650224, China
摘要:
Because of the different excitation conditions of the airgun source, there will be subtle differences in airgun signals. Travel time variation of airgun signals often mix into source information which can't fully reflect the evolution of the medium. This article uses the airgun signals from the Binchuan Transmitting Seismic Station to analyze the airgun signal's characteristics 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 travel time variation. The results show that:(1) The pressure pulse and its subsequent wave of airgun source wavelet are less affected by excitation conditions that we can use it to obtain high-precision excitation moments. (2) Deconvolution can improve the correlation of the airgun signal. (3) The pair difference method can't eliminate the influence of excitation conditions in 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.
关键词:  Airgun source  Pair difference  Deconvolution  Travel time variation  Correlation
DOI:10.19743/j.cnki.0891-4176.201902007
分类号:
基金项目:This project is jointly sponsored by the National Natural Science Foundation of China (41574059,41474048), Seismological Science and Technology Spark Program of China Earthquake Administration (XH16028), Scientific Research Fund of Institute of Seismology and Institute of Crustal Dynamics, China Earthquake Administration (IS201726164).
Study on the Influence of Airgun Excitation Conditions on Airgun Signals and Travel Time Variation Measurements
XIANG Ya1, YANG Runhai2, WANG Bin2, ZHOU Yunyao1, LU Yongqing1, WU Huan1, QI Junwei1, PENG Jing1
1.Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, China;2.Yunnan Earthquake Agency, Kunming 650224, China
Abstract:
Because of the different excitation conditions of the airgun source, there will be subtle differences in airgun signals. Travel time variation of airgun signals often mix into source information which can't fully reflect the evolution of the medium. This article uses the airgun signals from the Binchuan Transmitting Seismic Station to analyze the airgun signal's characteristics 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 travel time variation. The results show that:(1) The pressure pulse and its subsequent wave of airgun source wavelet are less affected by excitation conditions that we can use it to obtain high-precision excitation moments. (2) Deconvolution can improve the correlation of the airgun signal. (3) The pair difference method can't eliminate the influence of excitation conditions in 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:  Airgun source  Pair difference  Deconvolution  Travel time variation  Correlation