Abstract：The full horizontal gradient (HGM) and the square root of the sum of the squares of the horizontal, vertical and diagonal components (HVDM) in Tibetan plateau and surrounding region are calculated using the discrete wavelet transformation. The results show as follows: 1) the higher HGM of the sum of the 4th and 5th order wavelet details appeared on the Nepal Himalayas, eastern Himalayan syntaxis (EHS) and the Altyn Tagh fault, which are the more active tectonic belts around Tibetan plateau. 2) The high HGM values of the Nepal Himalayas and the western segment of the Altyn Tagh fault and morphology of the higher HGM belts around the Tibetan plateau identify differences in crustal thickness and material properties of the lower crust and the uppermost mantle in the Tibetan plateau and the blocks surrounding it. 3) The high HVDM belts distributed on the Himalayas, EHS, the Altyn Tagh fault and the Longmenshan fault reveal the morphological characteristics of the tectonic belts around the Tibetan plateau. 4) The epicenter of the 2015 Nepal earthquake is located on the low value belt of the HGM distribution with high\|low\|high, as well as at the boundary of the high HVDM value. This earthquake resulted from the accumulated energy caused by convergence of the India\|Eurasia continental collision and accommodation of the released large\|scale strike\|slip faults
XUAN Songbai,SHEN Wenbin,SHEN Chongyang et al. Gravitational Interpretation of Deep Structure in the Tibetan Plateau
and Its Relationship to the 2015 Nepal Earthquake[J]. jgg, 2015, 35(5): 729-733.
