地幔物质上涌对地震断裂酝育的作用

EFFECTS OF MANTLE UPWELLING ON POTENTIAL EARTHQUAKE FRACTURE

应用快速傅里叶变换和有限差分法分析仅有物质迁入时,具有不同倾角的正断层、逆断层和走滑断层上附加强度的变化和分布。研究发现,地幔物质上涌对地震断裂酝育和发生具有重要作用,其机制是上拱力和物质迁入共同作用使岩右圈中产生断层强度弱化区。

In this paper,the effects on the development and occurrence of earthquake fracture due to the quick upwell of the mantle have been studied. Using FFT(fast Fourier transform)and FDM(finite difference methed) ,we analyse the variation and distribution of additional strength on the normal .thrust and strike slip fault of different dips,in case that the action of upwelling is only as an up fluid migration through the bottom. We find that the upwelling plays an important role in the effect on the development and occurrence of earthquake fracture. Its mechanism is that the joint action of the upwelling stress and the upfluid migration produces weakening regions of fault strength in the lithosphere.