同震位移量与应变分析:以日本3.11地震房总半岛为例  

Co-seismic displacement and strain analysis:a case study of Boso Peninsula during 3.11 Japan Earthquake

作　　者：肖欣政 严丽 XIAO Xinzheng;YAN Li(School of Surveying and Geoinformation Engineering,East China University of Technology,Nanchang,Jiangxi 330013,China;Key Laboratory of Mine Environmental Monitoring and Improving around Poyang Lake of Ministry of Natural Resources,East China University of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]东华理工大学测绘与空间信息工程学院,江西南昌330013 [2]东华理工大学自然资源部环鄱阳湖区域矿山环境监测与治理重点实验室,江西南昌330013

出　　处：《北京测绘》2025年第1期97-104,共8页Beijing Surveying and Mapping

基　　金：江西省自然科学基金(20232BAB203073);江西省数字国土重点实验室开放基金(DLLJ202203)。

摘　　要：针对大地震发生时对周边区域产生同震位移影响的问题,本研究基于日本房总半岛区域密集的全球导航卫星系统(GNSS)观测网络,计算了2011年日本东北Mw9.0级大地震期间该区域的同震位移量、应变、膨胀率等。结果表明:大地震所释放的能量对房总半岛区域产生了显著影响。同震期间房总半岛的最大水平位移超过970 mm,最大垂向位移达到220 mm;区域内应变主要集中于房总半岛北部,最大值超过15×10^(-5)a^(-1),而最大剪切应变达到9.4×10^(-5)a^(-1),远高于震前的1.9×10^(-7)a^(-1);区域膨胀率变化表明地震后房总半岛地块快速膨胀。房总半岛同震应变分析结果为进一步理解大地震对区域地壳变形的影响提供了重要的科学依据。This paper analyzed co-seismic displacement effects in surrounding regions during large earthquakes.Based on the dense global navigation satellite system(GNSS)observation network around the Boso Peninsula area in Japan,the paper calculated the co-seismic displacement,strain,and expansion rate of the area during the Mw9.0 great earthquake in northeast Japan in 2011.The results indicate that the energy released by the great earthquake has a significant impact on the Boso Peninsula.During the co-seismic event,the maximum horizontal displacement of the Boso Peninsula exceeds 970 mm,while the maximum vertical displacement reaches 220 mm.Strain is primarily concentrated in the northern part of the Boso Peninsula,with the maximum value exceeding 15×10^(-5).The maximum shear strain reaches 9.4×10^(-5),significantly higher than the pre-earthquake value of 1.9×10^(-7).Changes in the regional expansion rate suggest rapid post-earthquake crustal expansion of the Boso Peninsula.The analysis of co-seismic strain in the Boso Peninsula provides critical scientific insight into the impact of great earthquakes on regional crustal deformation.itical scientific insight into the impact of large earthquakes on regional crustal deformation.

关 键 词：房总半岛 同震位移 主应变 最大剪切应变 膨胀率 

分 类 号：P228[天文地球—大地测量学与测量工程]