CAJ | 학술논문

在离散波数法基础上计算2008年3月21日新疆于田 MS 7．3地震造成的近场区域完全库仑应力变化，分析该变化对余震发生所产生的影响，得到了此次地震在2008年10月5日乌恰 MS 6．8地震震中处所产生的动态库仑破裂应力变化．计算结果表明，该地震近场区域库仑应力变化图像演化大概持续了60 s，库仑应力变化对余震的触发率达到90％以上，其中动态库仑应力变化图像更好地解释了余震的分布．余震震中处的完全库仑应力变化计算结果表明，其动态库仑应力变化远远大于静态库仑应力变化．于田 MS 7．3地震在乌恰 MS 6．8地震震中处造成的最大动态库仑应力变化为0．12 MPa，说明后者可能受到了于田 MS 7．3地震的动态应力触发作用，但不显著；而静态库仑应力则对其影响很小．
재리산파수법기출상계산2008년3월21일신강우전 MS 7．3지진조성적근장구역완전고륜응력변화，분석해변화대여진발생소산생적영향，득도료차차지진재2008년10월5일오흡 MS 6．8지진진중처소산생적동태고륜파렬응력변화．계산결과표명，해지진근장구역고륜응력변화도상연화대개지속료60 s，고륜응력변화대여진적촉발솔체도90％이상，기중동태고륜응력변화도상경호지해석료여진적분포．여진진중처적완전고륜응력변화계산결과표명，기동태고륜응력변화원원대우정태고륜응력변화．우전 MS 7．3지진재오흡 MS 6．8지진진중처조성적최대동태고륜응력변화위0．12 MPa，설명후자가능수도료우전 MS 7．3지진적동태응력촉발작용，단불현저；이정태고륜응력칙대기영향흔소．
Based on the discrete-wavenumber method,we calculated the com-plete Coulomb failure stress (CFS)changes of near-field region induced by 21 March 2008,Yutian,Xinjiang,MS 7.3 earthquake,and analyzed their impact on the aftershocks.We also get the dynamic CFS changes of the Yutian earth-quake produced at the epicentral location of the Wuqia MS 6.8 earthquake on 5 October 2008.The calculated results show that the evolution of CFS change patterns lasted for almost 60 s,and trigger ratio of aftershocks by the main shock is above 90%.Dynamic CFS change patterns can better explain the distri-bution of aftershocks.Complete CFS changes results of aftershocks indicate that the dynamic CFS changes are far greater than static ones.The maximum dynamic CFS change at the epicenter of Wuqia earthquake is 0.12 MPa,sugges-ting that the Wuqia event may be triggered by dynamic Coulomb stresses induced by the Yutian event,but the triggering effect is unremarkable and static CFS changes have little influence on it.