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据尼泊尔境内的连续GPS观测资料显示,2015年4月25日的尼泊尔M_w7.8级地震造成尼泊尔向南移动,最大位移量达到了1.88 m.利用国家重大科技基础设施项目“中国大陆构造环境监测网络”、中国气象局中日合作JICA项目及加州理工学院在尼泊尔境内所建的连续GPS观测资料,分析了此次地震对中国大陆构造形变场的震时动态响应及同震影响.结果显示,地震造成中国西藏地区毫米至厘米级的同震水平位移,最大值在震中北东方向,震中距220 km的珠峰站,约为30 mm,波及范围远至1500 km之外的高原东北部的祁连山地区.1 Hz的高频GPS数据分析表明,震中距1200 km内的站点记录了弹性震波和永久变形的叠加和破裂方向效应等丰富信息.通过分析中国境内地震活动频度并对比2011年日本宫城地震发现,本次尼泊尔地震并未造成中国境内微震活动显著增加,同震过程对中国西藏部分地区、川滇地区及南北地震带断裂带的应力扰动和构造加载有限,与其震级相对较小有关.
According to continuous GPS observations in Nepal, the magnitude M8.7 earthquake in Nepal on 25 April 2015 caused the southward movement of Nepal with a maximum displacement of 1.88 m. Using the major national infrastructure project “Construction Environment in Mainland China Monitoring network ”, China Jidah cooperation JICA project of China Meteorological Administration and California Institute of Technology built in Nepal continuous GPS observation data to analyze the impact of the earthquake on tectonic deformation of the Chinese mainland earthquake response and coseismic impact .Results Shows that the earthquakes caused a horizontal coseismic horizontal displacement of millimeters to centimeter level in Tibet of China, with the maximum in the epicenter NE direction at an altitude of about 30 mm at Everest station with an epicenter distance of 220 km and plateau northeast beyond the reach of 1,500 km Ministry of Science and Technology of China, Ministry of Education, Southwest Jiaotong University, Xi’an 710049, China) High frequency GPS data analysis of 1 Hz shows that epicenter distances within 1,200 km of epicenter have abundant information on superposition and rupture direction of elastic wave and permanent deformation, etc. By analyzing the frequency of seismic activity in China and comparing 2011 The Miyagi earthquake in Japan found that this earthquake in Nepal did not result in a significant increase in microseismic activity in China. The process of the coseismic shock on some parts of China’s Tibet, Stress perturbations and construction area and the north-south fault zone seismic belt load limited, related to its magnitude is relatively small.