Abstract
We used the interpolation method of two-dimensional vector velocity field data based on Green’s function to conduct coupled interpolation with a Poisson’s ratio of 0.5 for 1966 horizontal velocity field data from 1999 to 2017 and obtained the uniform velocity field and strain rate field with a grid of 1°. The main results are as follows: the eastern Himalayan structure as the center, the eastern Lhasa block, the eastern Qiangtang block, the Sichuan-Yunnan block, and the Burma block form a strong deformation rate zone of continuous deformation in the fan-shaped region, which has been a strong deformation rate zone for earthquakes of magnitude 7 or higher in continental China since 1963. Besides, the eastward movement of crustal material in the Tibetan Plateau is blocked by the stable South China block. Therefore, the direction of crustal material movement is deflected, which gradually forms a clockwise rotation motion system centered on the eastern Himalayan structure. Finally, our research shows that the influencing factors of strong earthquakes include velocity change, non-uniform strain distribution, accumulation of larger strain, and the difference of the second strain rate invariant. Strong earthquakes are closely related to the difference in energy accumulation in space.
Highlights
Located in the southeast of the Eurasian plate, sandwiched between the Indo-Pacific plate and the Philippine Sea plate, China is an area of strong late quaternary and modern tectonic activity
The eastward movement of crustal material in the Tibetan Plateau is blocked by the stable South China block
China is a region with the strongest earthquakes in the global continent (Figure 1), and 33% of the earthquakes in the global continent occur in continental China [1]
Summary
Located in the southeast of the Eurasian plate, sandwiched between the Indo-Pacific plate and the Philippine Sea plate, China is an area of strong late quaternary and modern tectonic activity. Under the interaction of the Indian Ocean plate, the Pacific Plate, the Eurasian Plate, and the Pacific Plate, as well as the action of the deep earth dynamics within the Eurasian plate, continental China has a unique spatial distribution pattern of strong earthquakes. Understanding the laws of block movement and crustal deformation plays a great role in the study and prediction of earthquakes, and at the same time, it can reduce the adverse effects of earthquake disasters to a certain extent [2]. The block model is mainly proposed by geologists, who believe that most of the deformation occurs along the main block boundary fracture. The continuous mRemodotee lSeinss.m20a2i0n, l1y2,p37r5o3posed by geophysicists, who believe that the deformation is quasi-continu2oouf 2s1, subject to the solid flow of viscous material similar to fluid control
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