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Anomaly Feature Extraction of the Gravity Field before the Jiuzhaigou Earthquake in 2017
Liu Fang1, Zhu Yiqing1, Zhao Yunfeng1, Liu Tao2
1.The Second Monitoring and Application Center, CEA, Xi'an 710054, China;2.Shaanxi Yan Chang Petroleum(Group) Co., Ltd, Xi'an 710075, China
摘要:
The MS7.0 Jiuzhaigou earthquake occurred on August 8, 2017. The earthquake occurred in the vicinity of the Tazang fault, the Minjiang fault and the Huya fault, where the focal mechanism is of the strike slip type. The static and dynamic anomalies of the gravity field can provide important physical field information for studying the structural properties of deep crust. Multi-scale decomposition techniques are used to separate Bouguer gravity at different depths and give some explanation to gravity variations at different time space scales.The results indicate that the wavelet multi-scale results of the EGM2008 model and the measured gravity data are consistent. Through comparative analysis, it is found that the Jiuzhaigou earthquake occurred in the stress enhanced region. The variation of gravity field at different time scales has a certain scientific significance for further understanding potential earthquake risk trend.
关键词:  Jiuzhaigou MS7.0 earthquake  Gravitational field  Wavelet decomposition  Multi-scale
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基金项目:This paper funded by the National Key Research and Development Program of China(2018YFC1503305) and the National Nature Science Foundation of China (41874092).
Anomaly Feature Extraction of the Gravity Field before the Jiuzhaigou Earthquake in 2017
Liu Fang1, Zhu Yiqing1, Zhao Yunfeng1, Liu Tao2
1.The Second Monitoring and Application Center, CEA, Xi'an 710054, China;2.Shaanxi Yan Chang Petroleum(Group) Co., Ltd, Xi'an 710075, China
Abstract:
The MS7.0 Jiuzhaigou earthquake occurred on August 8, 2017. The earthquake occurred in the vicinity of the Tazang fault, the Minjiang fault and the Huya fault, where the focal mechanism is of the strike slip type. The static and dynamic anomalies of the gravity field can provide important physical field information for studying the structural properties of deep crust. Multi-scale decomposition techniques are used to separate Bouguer gravity at different depths and give some explanation to gravity variations at different time space scales.The results indicate that the wavelet multi-scale results of the EGM2008 model and the measured gravity data are consistent. Through comparative analysis, it is found that the Jiuzhaigou earthquake occurred in the stress enhanced region. The variation of gravity field at different time scales has a certain scientific significance for further understanding potential earthquake risk trend.
Key words:  Jiuzhaigou MS7.0 earthquake  Gravitational field  Wavelet decomposition  Multi-scale