地震场源应变前兆的区别及其在地震预报中的应用
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THE DIFFERENCE BETWEEN STRAIN PRECURSORS WITHIN SEISMIC SOURCE AND SEISMIC FIELD REGIONS AND ITS APPLICATION TO EARTHQUAHE PREDICTION
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    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。

    Abstract:

    In this paper,on the basis of the combination pattern,author calculates two models by using the 3-D finite element method. The major conclusions are:(1)The adjustment element fractures firstly before the strong earthquake takes place,variation of strain with time is a quasi-lambda curve.(2)The accumulative element will fracture after the adjustment element fractures,variation of strain with time is a lambda curve.(3)The strain attenuates quickly along the perpendicular direction of fault strike,but slowly along the fault strike.(4)The situations of the clements in a seismic field region are very complex,and their strain changes with time are non-lambda curves. Finally,some seismic events about lambda-pattern are presented,and some precursory phenomena are interpreted by using conclusion(1).

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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].地震工程学报,1995,17(1):1-9. Li Qicheng. THE DIFFERENCE BETWEEN STRAIN PRECURSORS WITHIN SEISMIC SOURCE AND SEISMIC FIELD REGIONS AND ITS APPLICATION TO EARTHQUAHE PREDICTION[J]. China Earthquake Engineering Journal,1995,17(1):1-9.

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  • 在线发布日期: 2017-06-30