| 摘要: |
| 利用华北地区地震重力监测网的绝对重力与相对重力多期重复观测资料,处理获取不同时空尺度的华北区域重力场动态变化图像。利用二维小波分解技术,将不同场源深度异常进行了分离,并对不同时空尺度的重力变化给出了解释,提高了对华北地区重力场变化趋势的认识水平。在此基础上,通过对小波细节的功率谱分析,可以获得各阶小波变换逼近及小波细节分析图所对应的场源深度。研究结果表明,不同时空尺度的重力场变化对于深入认识华北地区潜在地震危险性具有一定的科学意义。 |
| 关键词: 小波分解 多尺度 重力场变化 功率谱 华北地区 |
| DOI： |
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| 基金项目:国家自然科学基金项目（41274083）、地震行业科研专项（20130108009）、中国地震局地球物理研究所基本科研业务专项（DQJB09A02）、震情跟踪青年课题（2012020204）共同资助 |
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| Multi-scale decomposition of wavelet of the temporal gravity variation in North China |
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Liu Fang1, Zhu Yiqing1, Chen Shi2
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1.Second Crust Monitoring and Application Center, CEA, Xi＇an 710054, China;2.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
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| Abstract: |
| On the basis of the absolute and relative gravity observations in North China, spatial dynamic variation results of regional gravity field are obtained. Multi-scale decomposition technique are used to separate anomalies at different depths, and give some explanation to gravity variations at different time space scales. Gravity variation trends in North China are improved. Based on this result, the analysis of wavelet power spectrum, the image of the depth of wavelet approximation and detail are obtained. The results obtained are of scientific significance to deeply understand the potential seismic rick in North China for gravity variations in different time space scales. |
| Key words: Wavelet decomposition Multi-scale Gravity variation field Power spectrum North China |
