Micro-plate tectonics and kinematics in Northeast Asia inferred from a dense set of GPS observations

Details Micro-plate tectonics and kinematics in Northeast Asia inferred from a dense set of GPS observations Micro-plate tectonics and kinematics in Northeast Asia inferred from a dense set of GPS observations

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.257..486j&link_type=abstract

Earth and Planetary Science Letters, Volume 257, Issue 3-4, p. 486-496.

Computer Science

13

Scientific paper

The plate tectonics of Northeast Asia are very complex with diffuse and sparse seismicity in the broad plate deformation zones embedded by a number of micro-plates, particularly the controversial Amurian plate. Now the increasingly dense GPS networks in this area provide an important tool to investigate plate tectonic kinematics and to identify the approximate plate tectonic geometries. In this paper, we have processed GPS data (1998 2005) collected by an extensive GPS network (China and South Korea) with more than 85 continuous sites and about 1000 campaign GPS stations. The kinematics of Northeast Asia is studied by modeling GPS-derived velocities with rigid block rotations and elastic deformation. We find that the deformation in Northeast Asia can be well described by a number of rotating blocks, which are independent of the Eurasian plate motion with statistical significance above the 99% confidence level. The tectonic boundary between the North China and Amuria plates is the Yin Shan Yan Shan Mountain belts with about 2.4 mm/yr extension. Along the boundary between North China and South China, the Qinling Dabie fault is moving left laterally at about 3.1 mm/yr. The Amuria and South Korea blocks are extending at about 1.8 mm/yr. The Baikal Rift between the Amurian and Eurasian plates is spreading at about 3.0 mm/yr. The 9 17 mm/yr relative motion between the Amuria and Okhotsk blocks is accommodated at the East Sea Japan trench zone. Localized deformation near the Qinling Dabie fault and Yin Shan Yan Shan Mountain belts may be elastic strain accumulation due to interseismic locking of faults.

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