Deformation Behavior of Cross-Fault Leveling in the Capital Circle
Region before and after the March 11, 2011 M9.0 Tohoku-Oki
Earthquake and Its Genetic Mechanism
1 Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, CEA, 1 Anningzhuang Road, Beijing 100085, China
2 School of Earth Sciences and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Beijing 100083, China
Abstract：〗In this paper, we explore the crustal deformation in the Capital circle region (114°-119°E, 39°-41°N) before and after the March 11, 2011 M9.0 Tohoku earthquake, according to the cross-fault leveling data in this area. Then we construct the three-dimensional finite element model in the Capital circle region, and preliminarily analyze the dynamic mechanics that reflect the deformation behavior, through the cross-fault observation line in different geometric structures. The results show that (1) the cross-fault leveling data expresses the unanimous characters that reflect the same fault activity type, in which the leveling variation changes from 0.07 mm in Babaoshan and Shangwan sites to 1.09 mm in Jingxi proving ground with the vertical intersecting line| (2) the hanging wall drops vertically relative to the opposite for the NNE-NE and the NW strike faults, which represents the tensional activity| (3) the vertical results of the cross-fault baseline with different directions, which are deduced from the numerical model, also illustrate the same fault activity style as the observed results (i.e., the hanging wall drops vertically relative to the heading wall)| and (4) the nearly EW trending tensile stress is mainly responsible for the unanimous deformation behavior in the Capital circle region.
LI Yujiang,CHEN Lianwang,LIU Shaofeng et al. Deformation Behavior of Cross-Fault Leveling in the Capital Circle
Region before and after the March 11, 2011 M9.0 Tohoku-Oki
Earthquake and Its Genetic Mechanism[J]. jgg, 2015, 35(4): 594-599.
