A Discussion on the Impact of Japan
详细信息
- 责任者：Feng Chengjun (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Zhang Peng
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(6)
- 关键词：地震危险性 ; seismic risk ; 活动构造 ; active tectonics ; 东北地区 ; Northeast China ; 华北地区 ; North China ; 日本 ; Japan
- 页码：p.123-140
- 图表：13 illus., 2 tables, 82 refs.
- 分类号：0500
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
According to the finite-fault model released by USGS,co-seismic horizontal displacement and horizontal principal stress field in north and northeast China continent generated by Japan MW9.0earthquake on March 11,2011were retrieved by the linear elastic finite element numerical simulation;on this basis,the static Coulomb failure stress of the active fault or tectonic zones in north and northeast China continent were calculated and the trigger effect of the earthquake risk in north and northeast China continent was discussed.The results showed that:(1)the horizontal displacement caused by Japan earthquake in north China continent was eastward and the maximum displacement that distributed in Shandong peninsula and north Jiangsu was about 12mm,while it gradually decreased from east to west;the horizontal displacement in northeast China continent was towards SE-SEE and the maximum displacement that distributed in northeast of Jilin was about30mm;generally the simulation results of the co-seismic horizontal displacement were in agreement with the GPS observations;that(2)near surface co-seismic stress changes generated by Japan MW9.0earthquake were mainly horizontal,while the vertical co-seismic stress change was 0-0.085kPa being approximately equal to zero;between two co-seismic horizontal principal stresses,the maximum co-seismic horizontal principal stress in north and northeast China continent was not only tensile stress but also compressive stress with the value of0-0.75kPa and the direction was converted from NE→NNE→SN to NNW from northeast to north areas;coseismic minimum horizontal principal stress was tensile stress with the magnitude of 0-3.20kPa and orientated from NW→NWW→EW to NEE from northeast to north areas;generally,the co-seismic stress effect could have some effects on the present tectonic stress field in north and northeast continent,however,the distribution pattern of present tectonic stress field did not change;that(3)Coulomb failure stress on the active fracture planes in north and northeast continent mainly increased,however,the increased value was no more than 1kPa,and,in contrast,the increased Coulomb failure stress values of middle and northeast segments of Tan-Lu fault zone as well as Mishan-Dunhua fault zone were the largest.In a word,there were some accelerated triggering actions of the Japan earthquake for the seismic in north and northeast China,however,the triggering intensity was limited.Even so,to carry on further studies is significant for earthquake prevention and disaster mitigation in these areas.