基于GPS观测研究中国东北地区现今地壳形变特征

Abstract

Abstract: Using the GPS data observed from northeastern China and southeast of Russian Far East over the period of 2012—2017, we derived a velocity field within the ITRF2014, by fitting GPS time series with a multi-term functional model incorporating annual and semi-annual signals, linear trend as well as offsets. Subsequently, we transformed the velocity field into a Eurasia-fixed velocity field and analyzed its spatial characteristics. By taking the multi-scale spherical wavelet approach, we calculated strain rate tensors and analyzed the spatial distribution of various resolving scales. Meanwhile, we investigated the contribution due to the post-seismic relaxation of the 2011 M_W9.0 Tohoku earthquake, Japan and the background deformation field characteristics. The results show that if the relaxation effect of the great earthquake in northeastern Japan is not deducted, the velocity field relative to the Eurasian plate generally moved southwestward. The movements between Yilan-Yitong Fault and Nenjiang Fault is characterized by counter-clockwise rotation, but other regions moves southeastward with a good consistency in orientation and an increase in intensity east of Mishan-Dunhua Fault. The motions for the Dunhua-Mishan Fault and the Yilan-Yitong Fault are characterized by extensions of 3.96±0.04 mm/a and 0.71±0.05 mm/a, respectively. The fault-parallel motion is negligible for the two faults. Principal strain rates were dominated by NW-SE extension and NE-SW compression. The dilation rates show that it is undergoing compression for the southern portion of Yilan-Yitong Fault, northern end of the Nenjiang Fault and the southeast of Russian Far East. The deformations were generally oriented SE due to the post-seismic viscoelastic relaxation of the 2011 M_W9.0 Tohoku earthquake, inversely proportional with the epicentral distances. The corresponding principal strain rates were also characterized by NW-SE extension and NE-SW compression. The dilations were characterized as contraction for the southern segment of the Yilan-Yitong Fault and the Mishan-Dunhua Fault, the northern end of the Nenjing Fault and Russian Far East. Localized maximum shear rates were identified around the southern borderland between northeastern China and the southeast of Russian Far East. After the subtraction of the contribution due to the viscoelastic relaxation from the observed velocity, the principal strain rates were also characterized by NW-SE extension and NE-SW compression. The dilation rates were significant in the southern end of the Yilan-Yitong Fault and the Mishan-Dunhua Fault, over the Second Songhuajiang Fault and the southern borderland between northeast China and Russian Far East. The maximum shear rates are still significant for the above regions, indicative of fast and continuing strain buildup there.

Key words: Northeast China, Multi-scale spherical wavelet, Strain rate field, the 2001 M_W9.0 Tohoku earthquake, Post-seismic viscoelastic relaxation

CLC Number:

P315.7

YU Ji-peng, MENG Guo-jie, SU Xiao-ning, Nikolay Shestakov, Mikhail Gerasimenko, Hiroaki Takahashi, Mako Ohzono, LIU Tai, LI Cheng-tao. The Current Crustal Deformation of Northeast China Deduced from GPS Observations[J]. EARTHQUAKE, 2019, 39(3): 11-27.

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The Current Crustal Deformation of Northeast China Deduced from GPS Observations

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