针对2015年4月25日发生于印度板块北边界中段的尼泊尔8.1级地震后，青藏高原中强以上地震活动呈现NE向条带分布的现象，本文将区域地质构造动力环境和以GPS水平位移为约束的数值模拟相结合，初步分析研究了这一地震活动条带的基本特征和形成机理；进而将其与1996年前后出现在青藏高原及东北部邻区的"西藏榭通门-内蒙古包头"NE向地震活动条带、以及该条带形成后强震活动由东向西的迁移状况进行比较，探讨了目前的NE向地震活动条带对未来强震活动趋势的预示意义。结果认为：尼泊尔8.1级地震后青藏高原NE向中强以上地震活动条带，是在印度板块北推挤压动力持续作用下，因青藏高原NE向构造应力加强引起的构造活动响应，并与尼泊尔大地震低角度逆冲错动和地壳介质能量传递影响有关；而未来地震趋势可能使该条带附近强震活动"填空"，进而使该条带东、西两侧较大范围强震活动性增强。

After the 2015 Nepal M_S8.1 earthquake,a strong and moderate seismic belt is gradually spreading along northeastern direction in the Qinghai-Tibetan plateau. In this paper,we attempt to summarize the feature and investigate the primary mechanism for this behavior of seismic activity,using a 2D finite element numerical model with the constraint of geology tectonic and GPS velocity. Additionally,comparing with the NE seismic belt triggering by the 1996 Xie-Tong-Men earthquake,we discuss the earthquake hazard in future in and around Qinghai-Tibetan plateau. Our results show that the NE direction seismic belt is the response of enhanced loading on anisotropic Tibetan plateau from the India plate and earthquake thrusting. Also,this possibly implies that the incoming strong earthquake may fill in the blanks of the NE direction seismic belt or enhance the seismic hazard in the eastern(the North-South Seismic Zone)and western(the Tianshan tectonic region)parts near the NE direction belt.

P315

地震行业科研专项《中国综合地球物理场观测-大华北地区》项目（201508009）资助