| 中国大陆6级以上强震前的地震应变场研究 |
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| 引用本文： | 杨明芝,马禾青,罗国富,许晓庆.中国大陆6级以上强震前的地震应变场研究[J].地球物理学报,2017,60(10):3804-3814. |
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| 作者姓名： | 杨明芝 马禾青 罗国富 许晓庆 |
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| 作者单位： | 宁夏地震局, 银川 750001 |
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| 基金项目： | 地震科技星火计划项目（XH183002）和中国地震局预测研究所所长重点基金（2016IES0101）资助. |
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| 摘 要： | 以地震应变场作为地震活动的变量,通过自然正交函数展开方法,计算了中国大陆6级以上强震前的地震应变场,提取出震前时间因子的异常变化.计算结果分析发现大地震前时间因子在平稳背景上会出现突跳上升或突跳下降变化,且震前地震应变场前4个典型场中至少有3个典型场会出现异常变化,具有多分量显示异常的特点,而异常出现的最早时间大约在震前3年,并且一些地震前出现短临的时间因子异常变化特征.通过震例研究表明用地震应变场分析地震活动异常,提取的时间因子异常结果比应用地震能量场更具有独特的优越性,并讨论了应变场与能量场的差异.
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| 关 键 词： | 地震应变场 地震能量场 自然正交函数展开方法 时间因子 |
| 收稿时间： | 2016-07-26 |
Research on the seismic strain field before strong earthquakes above M6 in Chinese mainland |
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| YANG Ming-Zhi,MA He-Qing,LUO Guo-Fu,XU Xiao-Qing.Research on the seismic strain field before strong earthquakes above M6 in Chinese mainland[J].Chinese Journal of Geophysics,2017,60(10):3804-3814. |
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| Authors: | YANG Ming-Zhi MA He-Qing LUO Guo-Fu XU Xiao-Qing |
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| Institution: | Earthquake Administration of Ningxia, Yinchuan 750001, China |
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| Abstract: | In this paper, seismic strain field is considered as a variable of seismic activity. The strain field is calculated before the earthquake above M6 in the mainland of China and the abnormal change of time factor before the earthquake is extracted by means of the natural orthogonal function expansion method. The results show that the time factor before a large earthquake will change suddenly, jump up or down on a stationary background. At least 3 typical fields will show abnormal changes in the first 4 typical fields of seismic strain field before the earthquake, having the characteristics of multi-component display of anomalies. The earliest time of abnormal occurrence is about 3 years before the earthquake. Moreover, there are some short-term time factor anomalies before some earthquakes. The results of case studies show that the time factor anomaly extracted by strain field is more useful than seismic energy field in analyzing the anomaly of seismic activity. The difference between strain field and energy field is also discussed. |
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| Keywords: | The seismic strain field The seismic energy field Natural orthogonal function expansion method Time factor |
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