论文部分内容阅读
本文在地震地质调查的基础上,对鲜水河断裂带上朱倭、炉霍和道李三个M>6.5级地震的序列,结合全区4.0级以上地震分布和应力场调整关系,用平面应变问题的有限单元方法,采用降低震源区断层摩擦系数、保留断层错距(考虑地震之间相互影响又作了一些改正)等方法进行了计算。文中考虑了两种应力和位移边界条件,这些条件分别反映印度板块、太平洋板块和菲律宾海板块对本区的作用。并从大地震沿带迁移与应力场调整关系中对未来地震的蕴党以及三要素进行了讨论。实验认为: 1.鲜水河断裂带应力场调整与大地震沿带迁移活动,主要是断裂带以东区域在东部板块的推动下,向北西西方向运动与印度板块强制性限制下二者联合作用的结果。 2。三个大地震后应力场调整表明,该带未来强震危险区向南东段转移,有可能在韩宁一康定一带,以乾宁危险性较大。
Based on the seismo-geological survey, the series of M> 6.5 M> 6.5 earthquakes in Zhuoshou, Luhuo and Daoli in the Xianshuihe fault zone are combined with the adjustment of the earthquake distribution and stress field above the M≥ 4.0 in the whole area. The finite element method of strain problem is calculated by reducing the coefficient of friction in the source region and preserving the fault distance (taking into account the interaction between the earthquakes and some corrections). Two stress and displacement boundary conditions are considered in the paper, and these conditions respectively reflect the role of the Indian Plate, the Pacific Plate and the Philippine Sea Plate in this region. And from the relationship between the migration along the major earthquake and the adjustment of stress field, the author discusses the essence of the future earthquakes and the three elements. The experiment shows that: 1. The adjustment of stress field in Xianshuihe fault zone and migration along the major earthquakes are mainly due to the combination of the eastward movement of the fault zone under the impetus of the eastern plate, the northwest-west movement and the mandatory restriction of the Indian plate The result of the action. 2. The adjustment of the stress field after the three major earthquakes shows that it is possible that the danger zone of the strong earthquake will migrate to the south and east in the future and may be dangerously dangerous in the Hanning-Kangding area.