摘要
基于1970年通海MS7.7地震的破裂参数,利用模型对不同岩石圈流变特性下库仑破裂应力的变化进行研究,探讨通海地震的静态同震变形和短期震后变形对小江断裂带和红河断裂带上潜在地震活动的影响。结果表明,这2条断裂带的一些断裂段在深度7.5 km处库仑破裂应力增量(ΔCFS)的震时变化达到0.12~0.50 bar,48 a后由于下地壳和上地幔的应力松弛,相同位置的库仑破裂应力增量高达0.22~0.90 bar。说明1970年通海MS7.7地震增强了小江断裂带和红河断裂带上潜在的地震活动性,在将来的地震工作中应加强对其的研究,并通过增加野外观测的方式监测其地震活动与地壳运动模式。
Based on previous studies,the rupture parameters of the 1970 Tonghai M_S7.7 earthquake are obtained.Using the model,we study the changes of Coulomb rupture stress under different lithospheric rheological properties.We discuss the effects of static co-seismic deformation and short-term post-earthquake deformation on potential seismic activity in the Xiaojiang fault and the Red River fault.Results show that on some segments of the two faults,the coseismic change of Coulomb failure stress(ΔCFS)attains 0.12-0.50 bar at 7.5 km depth.Relaxation of the lower crust and the upper mantle adds the postseismicΔCFS on the two faults up to 0.22-0.90 bar after 48 years.This means that the 1970 event is increasing the potential of seismic activity along the two active faults.In this case,we should pay more attention to these two active faults in future research by increasing field observations to monitor the seismic activity and the crustal motion pattern.
作者
朱晓杰
何建坤
ZHU Xiaojie;HE Jiankun(Key Laboratory of Continent Collision and Plateau Uplift,Institute of Tibetan Plateau Research,CAS,16 Lincui Road,Beijing 100101,China;University of Chinese Academy of Sciences,A19 Yuquan Road,Beijing 100049,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2019年第12期1223-1227,1282,共6页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41674104)~~
关键词
走滑断裂带
同震变形
震后变形
地震破裂参数
库仑破裂应力增量
strike-slip faults
coseismic deformation
postseismic deformation
seismic rupture parameters
Coulomb failure stress
