| Anomaly Feature Extraction of the Gravity Field before the Jiuzhaigou Earthquake in 2017 |
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| 作者姓名： | Liu Fang Zhu Yiqing Zhao Yunfeng Liu Tao |
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| 作者单位： | The Second Monitoring and Application Center, CEA, Xi''an 710054, China,The Second Monitoring and Application Center, CEA, Xi''an 710054, China,The Second Monitoring and Application Center, CEA, Xi''an 710054, China,Shaanxi Yan Chang Petroleum(Group) Co., Ltd, Xi''an 710075, China |
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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). |
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| 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.
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| 关 键 词： | Jiuzhaigou MS7.0 earthquake Gravitational field Wavelet decomposition Multi-scale |
| 收稿时间： | 2017/10/27 0:00:00 |
| 修稿时间： | 2017/12/1 0:00:00 |
Anomaly Feature Extraction of the Gravity Field before the Jiuzhaigou Earthquake in 2017 |
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| Liu Fang,Zhu Yiqing,Zhao Yunfeng,Liu Tao.Anomaly Feature Extraction of the Gravity Field before the Jiuzhaigou Earthquake in 2017[J].Earthquake Research in China,2018,32(4):501-509. |
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| Authors: | Liu Fang Zhu Yiqing Zhao Yunfeng and Liu Tao |
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| Institution: | The Second Monitoring and Application Center, CEA, Xi''an 710054, China,The Second Monitoring and Application Center, CEA, Xi''an 710054, China,The Second Monitoring and Application Center, CEA, Xi''an 710054, China and Shaanxi Yan Chang Petroleum(Group) Co., Ltd, Xi''an 710075, China |
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| 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. |
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| Keywords: | Jiuzhaigou MS7 0 earthquake Gravitational field Wavelet decomposition Multi-scale |
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