| 地表潮汐线应变组合观测的信息提取方法 |
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| 引用本文： | 蒋骏,张雁滨.地表潮汐线应变组合观测的信息提取方法[J].中国地震,1993,9(1):74-82. |
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| 作者姓名： | 蒋骏 张雁滨 |
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| 作者单位： | 国家地震局地震研究所，国家地震局地震研究所 中国武汉 430071，中国武汉 430071 |
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| 基金项目： | 地震科学联合基金(JJ92237) |
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| 摘 要： | 根据应变花理论,给出了由任意三方向潮汐线应变组合观测确定平面应变状态及提取潮汐面应变、体应变、平面剪切应变信息的方法和公式;特别是,根据潮汐应变理论和实际潮汐线应变的观测事实,利用两潮汐线应变差组合的特征,对地表潮汐剪切应变进行模拟,提出了由地表任意两独立方向潮汐线应变的组合观测确定地表潮汐平面应变状态及提取潮汐面应变、体应变信息的方法和公式,根据波叠加原理,提出了描述组合信息的统一公式,并导出了与之对应的各组合信息的大地系数和附加相位表达式;最后,简要讨论了各组合信息的前兆性物理实质,并得出潮汐线应变差组合观测对地震前兆信息的响应特征完全等价于地表平面内的潮汐剪切应变观测对地震前兆信息的响应特征。
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| 关 键 词： | 地震前兆 潮汐线 观测 信息 |
Extraction of Combinatory Information of Tidal Line Strain on the Earth's Surface |
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| Jiang Jun Zhang Yanbin.Extraction of Combinatory Information of Tidal Line Strain on the Earth''s Surface[J].Earthquake Research in China,1993,9(1):74-82. |
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| Authors: | Jiang Jun Zhang Yanbin |
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| Abstract: | Acorrding to the strain flower theory,the method and formulas which determined plane strain state and extracted tidal plane strain, volumetric strain and shear strain by combinatory observation of three tidal strain components are given. Especially, based on the tidal strain theory and the actural observation of tidal line strain, a tidal shear strain on the earth' s surface is simulated by using the character of subtractive combination of tidal line strain. We have raised a new method and formulas which determined plane strain state and extracted tidal plane strain, volumetric strain and shear strain by combinatory observation of two tidal strain components. An universal formula for discribing the combinatory information is put forward by the principle of wave superposition,and also we have driven the relevant geodetic coefficients and additional phase of combinatory information. Finally we briefly discuss the precursory physical mechanism of combinatory information and obtain that the subtractive combination of tidal line strain and the tidal shear strain on the earth' s surface are complete equivalent with the precursory response of an earthquake. |
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| Keywords: | Tidal line strain Combinatory observation Sum combination Subtractive combination Extraction of information |
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