| 汶川8.0级地震前龙门山断裂带能量场变化 |
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| 引用本文： | 杨明芝,马禾青.汶川8.0级地震前龙门山断裂带能量场变化[J].中国地震研究,2012,26(3):355-364. |
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| 作者姓名： | 杨明芝 马禾青 |
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| 作者单位： | 宁夏回族自治区地震局，银川市北京东路244号 750001;宁夏回族自治区地震局，银川市北京东路244号 750001 |
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| 摘 要： | During the process of preparation and occurrence of a large earthquake,the stress-strain state along the fault zone has close relation with the weak seismicity around the fault zone. The seismic energy release near the fault zone before an earthquake can better reflect the dynamic process of earthquake preparation. Thus,in this paper,the method of natural orthogonal function expansion has been adopted to discuss the time variation about the energy field of the seismic activity along the Longmenshan fault zone before the Wenchuan M_S 8. 0 earthquake,2008. The results show that evident short-term rise changes appeared in the time factors of the typical field corresponding to several key eigenvalues of the energy field along the Longmenshan fault zone before the Wenchuan earthquake,probably being the short-term anomaly message for this earthquake. Through contrastive analysis of earthquake examples such as the 1976 Tangshan earthquake,the authors think that the study of time variation of energy field of seismicity along active fault zone will be helpful for conducting intentional and intensive earthquake monitoring and forecast in active fault regions with high seismic risk based on medium- and long-term earthquake trend judgment.
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| 关 键 词： | Longmenshan fault zone Energy field Natural orthogonal function expansion Time factor anomaly Wenchuan M_S 8. 0 earthquake |
Variation of the Energy Field of Longmenshan Fault Zone before the Wenchuan MS8.0 Earthquake |
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| Yang Mingzhi and Ma Heqing.Variation of the Energy Field of Longmenshan Fault Zone before the Wenchuan MS8.0 Earthquake[J].Earthquake Research in China,2012,26(3):355-364. |
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| Authors: | Yang Mingzhi and Ma Heqing |
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| Institution: | Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China;Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China |
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| Abstract: | During the process of preparation and occurrence of a large earthquake, the stress-strain state along the fault zone has close relation with the weak seismicity around the fault zone. The seismic energy release near the fault zone before an earthquake can better reflect the dynamic process of earthquake preparation. Thus, in this paper, the method of natural orthogonal function expansion has been adopted to discuss the time variation about the energy field of the seismic activity along the Longmenshan fault zone before the Wenchuan MS8.0 earthquake, 2008. The results show that evident short-term rise changes appeared in the time factors of the typical field corresponding to several key eigenvalues of the energy field along the Longmenshan fault zone before the Wenchuan earthquake, probably being the short-term anomaly message for this earthquake. Through contrastive analysis of earthquake examples such as the1976 Tangshan earthquake, the authors think that the study of time variation of energy field of seismicity along active fault zone will be helpful for conducting intentional and intensive earthquake monitoring and forecast in active fault regions with high seismic risk based on medium- and long-term earthquake trend judgment. |
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| Keywords: | Longmenshan fault zone Energy field Natural orthogonal function expansion Time factor anomaly Wenchuan MS8 0 earthquake |
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