青藏高原东北缘重力势能与水平偏应力研究

doi:10.12196/j.issn.1000-3274.2022.02.001

Abstract

Abstract: A quantitative study on the deviatoric stress field of the Northeast Qinghai-Tibet Plateau is of vital importance to reveal the tectonic motion of this region. Based on the in-situ gravity and GPS observations, the current study calculates the gravity potential energy of the study area and evaluates the induced horizontal deviatoric stress, which is then analyzed and compared to the Global Strain Rate Map (GSRM). The results indicate that the gravity potential energy of the study area is featured by a characteristic of high values at the Qinghai-Tibet Plateau and low values at the Ordos Block. The highest value of gravity potential energy locates at the northern Qinghai-Tibet Plateau, with a magnitude of 1.53×10¹⁴ N/m, whereas the lowest value of gravity potential energy locates at the southern Qinling Orogen, with a magnitude of 1.45×10¹⁴ N/m. The deviatoric stress induced by the difference of gravity potential energy is relatively large at the northern Qinghai-Tibet Plateau, southern Ordos Block, and eastern Qinling Orogen. The largest stress occurs at the conjunction region between the Qinghai-Tibet Plateau and the Alax Block, with a magnitude of about 14 MPa.

Key words: the Northeast Qinghai-Tibet Plateau, Gravity potential energy, Dynamic topography, Horizontal deviatoric stress

CLC Number:

P315.7

WANG Zhen-yu, FU Guang-yu, LIU Tai, GUO Ling-dong, CHEN Wei, FANG Ting-ting. Study on Gravity Potential Energy and Horizontal Deviatoric Stress of the Northeast Qinghai-Tibet Plateau[J]. EARTHQUAKE, 2022, 42(2): 1-13.

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Study on Gravity Potential Energy and Horizontal Deviatoric Stress of the Northeast Qinghai-Tibet Plateau

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