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Comparative Study on Two Methods for Measuring Wave Velocity Change of Crustal Medium Based on Large Volume Airgun Excitation Data
YE Beng1,2, CAO Wenzhong2, HUO Yuanhang2, CHEN Jia1, LI Xiaobin1
1.Office of the Western Yunnan Earthquake Prediction Study Area, CEA, Dali 671000, Yunnan, China;2.University of Science and Technology of China, Hefei 230000, China
摘要:
This paper proposes the application of dynamic programming method to calculate the relative change of wave velocities and compares its similarities and differences with the cross-correlation delay estimation method based on interference. The results show that:① the trend of wave velocities obtained by cross-correlation method and dynamic programming method are consistent. Besides, it is considered that the calculated result using cross-correlation delay method is reliable. ② Compared with the cross-correlation delay method, the calculated result of the dynamic programming method has a magnifying effect and is more sensitive to small disturbances. ③ Under ideal conditions, the wave velocity change trend calculated by P-wave and S-wave phase should be consistent. In addition, the cross-correlation delay method is used to calculate the wave velocity change. Under appropriate conditions, the process of recovering from the suspected wave velocity before the ML1.1 earthquake near the airgun source can be observed.
关键词:  Artificial source  Airgun source  Cross-correlation  Wave velocity change  Dynamic programming
DOI:10.19743/j.cnki.0891-4176.201904009
分类号:
基金项目:This project sponsored by the Yunnan Youth Fund (2017K01) and the Assistantship Project of the Yunnan Earthquake Agency.
Comparative Study on Two Methods for Measuring Wave Velocity Change of Crustal Medium Based on Large Volume Airgun Excitation Data
YE Beng1,2, CAO Wenzhong2, HUO Yuanhang2, CHEN Jia1, LI Xiaobin1
1.Office of the Western Yunnan Earthquake Prediction Study Area, CEA, Dali 671000, Yunnan, China;2.University of Science and Technology of China, Hefei 230000, China
Abstract:
This paper proposes the application of dynamic programming method to calculate the relative change of wave velocities and compares its similarities and differences with the cross-correlation delay estimation method based on interference. The results show that:① the trend of wave velocities obtained by cross-correlation method and dynamic programming method are consistent. Besides, it is considered that the calculated result using cross-correlation delay method is reliable. ② Compared with the cross-correlation delay method, the calculated result of the dynamic programming method has a magnifying effect and is more sensitive to small disturbances. ③ Under ideal conditions, the wave velocity change trend calculated by P-wave and S-wave phase should be consistent. In addition, the cross-correlation delay method is used to calculate the wave velocity change. Under appropriate conditions, the process of recovering from the suspected wave velocity before the ML1.1 earthquake near the airgun source can be observed.
Key words:  Artificial source  Airgun source  Cross-correlation  Wave velocity change  Dynamic programming