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Numerical Simulation of the Binchuan Airgun Source Affected by Water Body
SUN Nan1,2, SUN Yaochong3
1.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2.Yunnan Earthquake Agency, Kunming 650224, China;3.Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
摘要:
The numerical simulation of the influence of a reservoir water body on the Binchuan airgun source could provide a theoretical basis to analyze the data obtained from the active source detection and inversion of regional interior medium structures. Based on a medium model containing limited water body, we use the finite different method to simulate the effect of the water level, excitation energy and focal depth. The results show that the influence on the waveform amplitude caused by the water level changing is very large near the water body, and that a high water level or large amplitude change can have a larger effect. However, for stations beyond a certain epicentral distance, the influence will be weakened and kept stable. As for the Binchuan airgun source, amplitude fluctuation caused by the water level changing becomes very small (±0.05 times) after propagating a certain distance, so we can remove the influence of the water level changing by referring to the numerical simulation result. Wave amplitude increases linearly with the excitation energy and focal depth, therefore, the greater the energy and the deeper the focal depth, the better the effect of the excitation, and is more conducive in detecting remote and deep penetration underground structures.
关键词:  Numerical modeling  Binchuan airgun source  Reservoir water level  Excitation energy  Focal depth
DOI:10.19743/j.cnki.0891-4176.201902001
分类号:
基金项目:This project was jointly sponsored by the Earthquake Science and Technology Spark Program (XH18044Y), the National Natural Science Foundation of China(41474048,41574059).
Numerical Simulation of the Binchuan Airgun Source Affected by Water Body
SUN Nan1,2, SUN Yaochong3
1.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2.Yunnan Earthquake Agency, Kunming 650224, China;3.Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
Abstract:
The numerical simulation of the influence of a reservoir water body on the Binchuan airgun source could provide a theoretical basis to analyze the data obtained from the active source detection and inversion of regional interior medium structures. Based on a medium model containing limited water body, we use the finite different method to simulate the effect of the water level, excitation energy and focal depth. The results show that the influence on the waveform amplitude caused by the water level changing is very large near the water body, and that a high water level or large amplitude change can have a larger effect. However, for stations beyond a certain epicentral distance, the influence will be weakened and kept stable. As for the Binchuan airgun source, amplitude fluctuation caused by the water level changing becomes very small (±0.05 times) after propagating a certain distance, so we can remove the influence of the water level changing by referring to the numerical simulation result. Wave amplitude increases linearly with the excitation energy and focal depth, therefore, the greater the energy and the deeper the focal depth, the better the effect of the excitation, and is more conducive in detecting remote and deep penetration underground structures.
Key words:  Numerical modeling  Binchuan airgun source  Reservoir water level  Excitation energy  Focal depth