| 地震场源应变前兆的区别及其在地震预报中的应用 |
| |
| 引用本文： | 李启成.地震场源应变前兆的区别及其在地震预报中的应用[J].西北地震学报,1995,17(1):1-9. |
| |
| 作者姓名： | 李启成 |
| |
| 作者单位： | 国家地震局兰州地震研究所 |
| |
| 摘 要： | 本文以组合模式基础，用三维有限元方法计算了两个模型，主要研究结论是：（１）在发生大地震前，调整单元首先破裂，其应变随时间变化曲线呈准“λ”型；（２）在调整单元破裂后，积累单元破裂，其应变随时间变化曲线呈“λ”型；（３）在断层垂直方向上应变衰减很快，而沿断层走向方向上衰减很慢；（４）场区各单元的情况很复杂，其应变随时间变化的曲线呈非“λ”型。最后本文列举了一些有关“λ”型的震例，并利用结论（１）解释了几种前兆现象。
|
| 关 键 词： | 组合模式，三维模型，有限元模拟，相变，应变 |
THE DIFFERENCE BETWEEN STRAIN PRECURSORS WITHIN SEISMIC SOURCE AND SEISMIC FIELD REGIONS AND ITS APPLICATION TO EARTHQUAHE PREDICTION |
| |
| Li Qicheng.THE DIFFERENCE BETWEEN STRAIN PRECURSORS WITHIN SEISMIC SOURCE AND SEISMIC FIELD REGIONS AND ITS APPLICATION TO EARTHQUAHE PREDICTION[J].Northwestern Seismological Journal,1995,17(1):1-9. |
| |
| Authors: | Li Qicheng |
| |
| Institution: | Earthquake Research Institute of Lanzhou, SSB, Lanzhou, 730000 |
| |
| Abstract: | In this paper,on the basis of the combination pattern,author caculates two models byusing the 3-D finite element method. The major conclusions are :(1)The adjustment elementfractures firstly before the strong earthquake takes place,variation of strain with time is aquasi-lambda curve.(2)The accumulative element will fracturc after the adjustment elementfractures,variation of strain with time is a lambda curve.(3)The strain attenuates quicklyalong thc perpendicular direction of fault strikc,but slowly aiong the fault strike.(4)The situa-tions of the clements in a seismic field region are very complex,and their strain changes withtime are non-lambda curves. Finally,some seismic events about lambda-pattern are presented,and some precursory phenomena are interpreted by using conclusion(1). |
| |
| Keywords: | Combination pattern Three-dimension model Finite element modeling Phase change Strain |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《西北地震学报》浏览原始摘要信息 |
| 点击此处可从《西北地震学报》下载免费的PDF全文 |
|
