Analysis of GEONET observations covering the entire territory of Japan shows that the great Tohoku-oki earthquake that occurred on March 11, 2011 off the east coast of Honshu in Japan caused an eastward movement of th...Analysis of GEONET observations covering the entire territory of Japan shows that the great Tohoku-oki earthquake that occurred on March 11, 2011 off the east coast of Honshu in Japan caused an eastward movement of the northern part of the island by as much as 5.3 m. The GPS data from TEONET in China were used to derive far-field coseismic displacements and to assess the impact of the Tohoku-oki earthquake on crustal deformation in eastern China. The results reveal that the coseismic horizontal displacements induced by the earthquake are the level of millimeters to centimeters in North and Northeast China, with a maximum of 35 mm. Strain analysis also indicates that the earthquake resulted in an increase in the tensile strain on the north-northeast trending faults in North and Northeast China. The tensile strain imposed on the Yilan-Yitong and Dunhua-Mishan faults is more significant than that imposed on the faults in North China; the maximum normal strain reaches about 40 nano-strain. Considering that the static Coulomb stress loaded on the faults is limited, its effect on the regional seismic activity may not be significant.展开更多
向下延拓是Stokes边值解算中必不可少的环节.为了研究向下延拓的远区影响,本文在泊松实用公式的基础上给出了顾及远区影响的向下延拓算法的推导过程.对4°×4°实验区内5'×5'分辨率模型扰动重力的向下延拓结...向下延拓是Stokes边值解算中必不可少的环节.为了研究向下延拓的远区影响,本文在泊松实用公式的基础上给出了顾及远区影响的向下延拓算法的推导过程.对4°×4°实验区内5'×5'分辨率模型扰动重力的向下延拓结果表明:对于地面重力数据的向下延拓,积分半径为1°、2°时,顾及远区影响的算法可将精度分别提高0.36 m Gal、0.17 m Gal;对于4000 m航高的重力数据的向下延拓,积分半径为1°、2°时,该算法可将精度分别提高1.40 m Gal、0.67 m Gal.延拓高度越高,积分半径越小,顾及远区影响的算法对精度的改善效果越明显.展开更多
基金supported by the State Key Laboratory of Earthquake Dynamics (LED2009A02)the National Key Infrastructure Project "Tectonic and Environmental Observation Network in China"
文摘Analysis of GEONET observations covering the entire territory of Japan shows that the great Tohoku-oki earthquake that occurred on March 11, 2011 off the east coast of Honshu in Japan caused an eastward movement of the northern part of the island by as much as 5.3 m. The GPS data from TEONET in China were used to derive far-field coseismic displacements and to assess the impact of the Tohoku-oki earthquake on crustal deformation in eastern China. The results reveal that the coseismic horizontal displacements induced by the earthquake are the level of millimeters to centimeters in North and Northeast China, with a maximum of 35 mm. Strain analysis also indicates that the earthquake resulted in an increase in the tensile strain on the north-northeast trending faults in North and Northeast China. The tensile strain imposed on the Yilan-Yitong and Dunhua-Mishan faults is more significant than that imposed on the faults in North China; the maximum normal strain reaches about 40 nano-strain. Considering that the static Coulomb stress loaded on the faults is limited, its effect on the regional seismic activity may not be significant.
文摘向下延拓是Stokes边值解算中必不可少的环节.为了研究向下延拓的远区影响,本文在泊松实用公式的基础上给出了顾及远区影响的向下延拓算法的推导过程.对4°×4°实验区内5'×5'分辨率模型扰动重力的向下延拓结果表明:对于地面重力数据的向下延拓,积分半径为1°、2°时,顾及远区影响的算法可将精度分别提高0.36 m Gal、0.17 m Gal;对于4000 m航高的重力数据的向下延拓,积分半径为1°、2°时,该算法可将精度分别提高1.40 m Gal、0.67 m Gal.延拓高度越高,积分半径越小,顾及远区影响的算法对精度的改善效果越明显.
