| The earthquake precursor detected in a granular medium and a proposed model for the propagation of precursive stress-strain signal | |
| Alternative Title | The earthquake precursor detected in a granular medium and a proposed model for the propagation of precursive stress-strain signal |
| Lu KunQuan1; Hou MeiYing1; Wang Qiang1; Peng Zheng1; Sun Wei2; Sun XiaoMing2; Wang YuYing3; Tong XiaoHui3; Jiang ZeHui4; Liu JiXing1 | |
| 2011 | |
| Source Publication | CHINESE SCIENCE BULLETIN
 |
| ISSN | 1001-6538 |
| Volume | 56Issue:11Pages:1071-1079 |
| Abstract | A way to detect the seismic precursor in granular medium is described and a model of propagation for precursive stress-strain signals is proposed. A strain sensor buried in a sandpit is used to measure a seismic precursor signal. The signal has been investigated and confirmed to originate from a specific earthquake. A comparison of simulated and experimental signals indicates that the signal results from the strain in the earth's strata. Based on the behavioral characteristics of granular materials, an analysis of why this method can be so sensitive to the seismic strain signal is undertaken and a model for the propagation of this stress-strain signal is proposed. The Earth's lithosphere is formed of tectonic plates, faults and fault gouges at their boundaries. In the case of the quasi-static mechanics of seismic precursory stress-strain propagation, the crustal lithosphere should be treated as a large-scale granular system. During a seismogenic event, accumulated force generates the stick-slip motion of adjacent tectonic plates and incrementally pushes blocks farther apart through stick-slip shift. The shear force released through this plate displacement causes soil compression deformation. The discrete properties of the sand in the sandpit lead to the sensitive response of the sensor to the deformation signal which enables it to detect the seismic precursor. From the analysis of the mechanism of the stress-strain propagation in the lithosphere, an explanation is found for the lack of signal detection by sensors installed in rocks. The principles and method presented in this paper provide a new technique for investigating seismic precursors to shallow-source earthquakes. |
| Other Abstract | A way to detect the seismic precursor in granular medium is described and a model of propagation for precursive stress-strain signals is proposed. A strain sensor buried in a sandpit is used to measure a seismic precursor signal. The signal has been investigated and confirmed to originate from a specific earthquake. A comparison of simulated and experimental signals indicates that the signal results from the strain in the earth's strata. Based on the behavioral characteristics of granular materials, an analysis of why this method can be so sensitive to the seismic strain signal is undertaken and a model for the propagation of this stress-strain signal is proposed. The Earth's lithosphere is formed of tectonic plates, faults and fault gouges at their boundaries. In the case of the quasi-static mechanics of seismic precursory stress-strain propagation, the crustal lithosphere should be treated as a large-scale granular system. During a seismogenic event, accumulated force generates the stick-slip motion of adjacent tectonic plates and incrementally pushes blocks farther apart through stick-slip shift. The shear force released through this plate displacement causes soil compression deformation. The discrete properties of the sand in the sandpit lead to the sensitive response of the sensor to the deformation signal which enables it to detect the seismic precursor. From the analysis of the mechanism of the stress-strain propagation in the lithosphere, an explanation is found for the lack of signal detection by sensors installed in rocks. The principles and method presented in this paper provide a new technique for investigating seismic precursors to shallow-source earthquakes. |
| Keyword | earthquake precursor earthquake prediction granular matter stress-strain transmission stick-slip movement |
| Indexed By | CSCD |
| Language | 英语 |
| Funding Project | [Chinese Academy of Sciences] ; [National Natural Science Foundation of China] |
| CSCD ID | CSCD:4266683 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/156629 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 1.中国科学院 2.Beijing Precis Technology Co Ltd, Beijing 100089, Peoples R China 3.中国科学院金属研究所 4.Harbin Institute Technol, Dept Appl Phys, Harbin 150001, Peoples R China |
| Recommended Citation GB/T 7714 | Lu KunQuan,Hou MeiYing,Wang Qiang,et al. The earthquake precursor detected in a granular medium and a proposed model for the propagation of precursive stress-strain signal[J]. CHINESE SCIENCE BULLETIN,2011,56(11):1071-1079. |
| APA | Lu KunQuan.,Hou MeiYing.,Wang Qiang.,Peng Zheng.,Sun Wei.,...&Liu JiXing.(2011).The earthquake precursor detected in a granular medium and a proposed model for the propagation of precursive stress-strain signal.CHINESE SCIENCE BULLETIN,56(11),1071-1079. |
| MLA | Lu KunQuan,et al."The earthquake precursor detected in a granular medium and a proposed model for the propagation of precursive stress-strain signal".CHINESE SCIENCE BULLETIN 56.11(2011):1071-1079. |
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