CAJ | 학술논문

芦山地震发生后，地震的发生造成周围断层应力变化值得关注。本文基于川滇地区的三维非线性有限元模型，利用芦山地震同震静态滑移量结果，分析地震的发生对川滇地区主要断裂的同震加卸载效应。初步结果表明，芦山地震的发生造成龙门山断裂中南段、岷江断裂、马尔康断裂、鲜水河断裂北西段、大凉山断裂南段、小江断裂南段不同程度的应力增加。其中龙门山断裂中南段增加最为显著，最大库仑应力增加量达0.035 MPa；岷江断裂次之，最大达0.0075 MPa；马尔康断裂增加量达0.0031 MPa；鲜水河断裂北西段达0.0008 MPa。而从断裂带同震应变积累与释放方面分析的结果同样表明上述四条断裂地震危险性增强。该结果可以为川滇地区地震危险性分析提供一定的参考依据。
호산지진발생후，지진적발생조성주위단층응력변화치득관주。본문기우천전지구적삼유비선성유한원모형，이용호산지진동진정태활이량결과，분석지진적발생대천전지구주요단렬적동진가사재효응。초보결과표명，호산지진적발생조성룡문산단렬중남단、민강단렬、마이강단렬、선수하단렬북서단、대량산단렬남단、소강단렬남단불동정도적응력증가。기중룡문산단렬중남단증가최위현저，최대고륜응력증가량체0.035 MPa；민강단렬차지，최대체0.0075 MPa；마이강단렬증가량체0.0031 MPa；선수하단렬북서단체0.0008 MPa。이종단렬대동진응변적루여석방방면분석적결과동양표명상술사조단렬지진위험성증강。해결과가이위천전지구지진위험성분석제공일정적삼고의거。
The stress change of the surrounding faults induced by the Lushan earthquake deserves attention. In this paper, the authors developed a three-dimensional nonlinear finite element model to explore the co-seismic loading/unloading effect, based on the coseismic static slip data deduced from the field body waveform record inversion. The preliminary results showed that the Lushan earthquake caused the lading effects on the mid-south Longmen Shan, Minjiang, Barkam, northwestern Xianshuihe, south Daliangshan, and south Xiaojiang faults; the mid-south Longmen Shan fault, in particular, had the significant increase which reached 0.035 MPa; Minjiang fault reached 0.0075 MPa, Barkam fault reached 0.0031 MPa and northwestern Xianshuihe fault reached 0.0008 MPa. These results corresponded well with those deduced from the coseismic strain accumulation and release aspects, and can hence provide a basis for the seismic risk analysis in the future.