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| 基于二维经验模态分解的河北省及邻区流动重力场时空动态变化分析 |
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侯晓真1,2,3, 马栋1,2, 屈曼1,2, 刘洪良4, 张展伟4, 高晨1,2, 陈建国1,2
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1.河北红山巨厚沉积与地震灾害国家野外科学观测研究站, 河北邢台 054000;2.河北省地震局, 石家庄 050021;3.河北省地震局测震专业仪器系统检测评估与观测场地遴选创新团队, 石家庄 050021;4.河北省地震局流动测量队(保定中心台), 河北保定 071000
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| 摘要: |
| 搜集河北省及邻区2010—2019年20期的流动重力观测数据和绝对重力观测数据,利用二维经验模态分解方法获取河北省及邻区范围内(110°E～120°E,36°N～42°N)不同尺度、不同场源深度下的分解结果,并结合该时间段内M≥4.0震例进行回溯性检验。结果表明,当半年时间尺度与一年时间尺度下的1阶、2阶固有模态函数结果出现正-负重力高值差异或四象限异常变化时,在异常变化中心200km范围内存在2年内发生M4.0以上中强地震的可能。该结论可为河北省及邻区后续震情分析和研判提供参考。 |
| 关键词: 二维经验模态分解 功率谱 重力场 河北及邻区 |
| DOI： |
| 分类号:P315 |
| 基金项目:中国地震局震情跟踪定向工作任务青年课题(2023010201)、河北省省级科技计划资助项目(21375411D)、河北省地震科技星火计划攻关课题(DZ2021121200001)共同资助 |
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| Wavelet Analysis of Spatial-temporal Dynamics of Gravity Field in Hebei Province and Adjacent Areas |
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Hou Xiaozhen1,2,3, Ma Dong1,2, Qu Man1,2, Liu Hongliang4, Zhang Zhanwei4, Gao Chen1,2, Chen Jianguo1,2
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1.Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards, Xingtai 054000, Hebei, China;2.Hebei Earthquake Agency, Shijiazhuang 050021, China;3.Innocative Research Team of Hebei Earthquake Agency for Seismographs Calibration, Valuation and Selection of Observation Sites, Shijiazhuang 050021, China;4.Mobile Survey Team of Hebei Earthquake Agency(Baoding Central Seismic Station), Baoding 071000, Hebei, China
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| Abstract: |
| The Bidimensional Empirical Mode Decomposition method was applied to the flow gravity observation data and absolute gravity observation data of Hebei Province and its adjacent areas(110°E～120°E,36°N～42°N) of the period of 2010 to 2019. And the decomposition results of gravity field at different time scales and depths scales were obtained. Combined with the case of earthquakes in this period,we find that when the result of order 1 and 2 intrinsic mode function about half-year and year time scales appears positive-negative gravity high value differences or four-quadrant changes,earthquake(M≥4.0) may happen within 200km of the abnormal center in the next 2 years. Our results can provide some reference for the subsequent seismic situation analysis and judgment in Hebei Province and neighboring regions. |
| Key words: Bidimensional empirical mode decomposition Power spectrum Gravity field Hebei Province and adjacent areas |
