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本文介绍了2015年4月25日尼泊尔8.1级地震是发生在喜马拉雅弧形地带的逆冲构造系内,是20 km深处的主喜马拉雅逆冲断裂(MHT,或拆离层)的上盘发生破裂,并引发一条向上逆冲断裂活动,这条逆冲断裂可能是主边界逆冲断裂(MBT)的再活化,或是一条新断裂;这是印度大陆持续向北移动(4 cm/a)与亚洲大陆挤压的结果;地震导致MBT南、北的上地壳楔抬升;地应力的释放将导致其东边或北侧地段地震的活动加多;喜马拉雅弧形地带大震的周期可能为50~60年,新地震发生在弧形地带内的临近发震地段内,是专家早已推测的将要发震的地段;喜马拉雅弧形地带是地震监测力量薄弱地带,从“一带一路”建设角度讲今后应加强监测工作,寻求地震前兆现象.
This article describes that on April 25, 2015, the magnitude 8.1 earthquake in Nepal occurred within the thrust structure of the Himalayan arc and occurred on the upper plate of the main Himalayan thrust (MHT) or detachment at a depth of 20 km Rupture and initiate an upwelling thrust fault that may be a reactivation of the main boundary thrust (MBT) or a new fault; this is a continuation of a northward movement (4 cm / a) And the crust of the Asian continent. The earthquake led to the uplift of the upper crust wedge in the south and north of the MBT. The release of geostress would result in more earthquakes in the eastern or northern part of the earthquakes. The period of the large earthquake in the Himalayan arc may be 50 ~ In the 60 years, the new earthquake occurred in the adjacent seismogenic area in the arc zone, which was already speculated by experts. The Himalayan arc is the weak area for seismic monitoring. From the perspective of the “Belt and Road” construction In the future, monitoring work should be stepped up to seek the precursory earthquake.