昆仑山口西8.1级地震的应力触发作用及对周边断层的影响
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摘要
采用可变滑动震源模型,计算M_s 8.1昆仑山口西地震产生的库仑破裂应力变化,解释余震的空间分布特征。以此为基础,分析了此次大地震在周边断层上产生的应力变化及其对地震活动性的影响。结果表明,两个模型和两种方法计算得到的应力变化均呈现相似的分布特征。应力增加区与后续地震活动的对应关系,反映昆仑山口西地震对后续地震活动的触发效应。玛尼断裂带和东昆仑断裂带受应力变化影响最明显。
Using the variable slip model,we calculate the Coulomb failure stress changes caused by the Kunlun M_S 8.1 earthquake,and explain the spatial distribution of aftershocks.On the basis of calculations,we determine the stress changes on nearby faults in the surrounding area, and investigate the effect on the seismic activities.Results show that the distribution of stress changes displays similar characteristics using two methods and two models.The correspondence between the stress change and seismicity is good,which indicate that the stress triggering effects induced by the Kunlun earthquake exist.The Mani fault and the eastern Kunlun fault are calculated to be obviously affected by the stress changes.
Using the variable slip model,we calculate the Coulomb failure stress changes caused by the Kunlun M_S 8.1 earthquake,and explain the spatial distribution of aftershocks.On the basis of calculations,we determine the stress changes on nearby faults in the surrounding area, and investigate the effect on the seismic activities.Results show that the distribution of stress changes displays similar characteristics using two methods and two models.The correspondence between the stress change and seismicity is good,which indicate that the stress triggering effects induced by the Kunlun earthquake exist.The Mani fault and the eastern Kunlun fault are calculated to be obviously affected by the stress changes.
引文
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万永革,吴忠良,周公威,等.地震静态应力触发模型的全球检验[J].地震学报,2002,24(3):301—315.
解朝娣,朱元清,雷兴林,等.汶川8.0级地震的余震触发作用和对断层的应力加卸载作用[J].地震地磁观测与研究,2010, 31(2):12—18.
徐锡伟,陈文彬,于贵华,等.2001年11月14日昆仑山库赛湖地震(M 8.1)地表破裂的基本特征[J].地震地质,2002, 24(1):1-13.
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