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鲁甸地震同震与震后形变、重力时空分布的理论模拟

Theoretical simulation of coseismic and post earthquake deformation and gravity spatial and temporal distribution of Ludian earthquake
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摘要 基于位错理论,考虑重力和黏弹性的影响,在分层介质模型下计算鲁甸地震引起的同震、震后形变和重力变化.结果表明形变和重力的显著变化主要发生于断层在地表投影附近区域.同震形变场显示发震断层有明显的走滑性质.考虑黏弹松弛效应,随着时间的推移,震后形变和重力有了明显改变,同震效应为正的区域得到加强,为负区域进一步减弱.震后松弛效应的影响范围相比同震明显增加.在靠近断层的GPS观测台站处,计算了由黏弹松弛效应引起的震后形变和重力时间序列.震后松弛效应引起的重力变化在50年之后均达到同震水平,除了NJ13的纬向、垂直位移,NJ16的垂直位移,NJ15的径向位移,其余台站的所有震后形变都超过1mm.观测台站的震后重力和垂直位移时间序列在震后100年趋于稳定,纬向位移和经向位移在震后50年趋于稳定. Base on the dislocation theory and layered half-space model,considering regional coefficients and gravity,we calculated the co-and post-seismic surface deformation and gravity changes caused by the Ludian earthquake.It is found that the area of the surface deformation and gravity significant change is closed to the rupture fault.At the same time,co-seismic deformation shows fault is of obvious slip characteristics.Considering viscoelastic relaxation,the time relaxation results show the post-seismic deformation and gravity significant change.Significant spatial variations can be found on the co-and post-seismic effects.We calculated the post-seismic deformation and gravity changes time series,considering the viscoelastic relaxation.The post-seismic gravity exceeded the co-seismic result in 50 years after the earthquake.All deformations exceed 1 mm except for N-S displacement、vertical displacement of NJ13,vertical displacement of NJ16,E-W displacement of NJ15.The time-variable curves of the stations show that post-seismic gravity and vertical displacement changes tend to be stable after 100 years,the post-seismic N-S displacement and E-W displacement changes tend to be stable after 50 years.
出处 《地球物理学进展》 CSCD 北大核心 2017年第4期1439-1446,共8页 Progress in Geophysics
基金 震情跟踪项目(2016010128) 中国地震局第一监测中心主任基金(FMC2015011) 地震科技星火计划项目(XH16055Y)联合资助
关键词 鲁甸地震 同震 震后 形变 重力 黏弹松弛 Ludian earthquake co-seismic post-seismic deformation gravity viscoelastic relaxation
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