川滇块体机械能与其边界带地震释放能量关系研究

STUDY ON THE RELATIONSHIP BETWEEN THE MECHANICAL ENERGY OF THE SICHUAN-YUNNAN BLOCK AND THE ENERGY RELEASED BY EARTHQUAKES IN ITS BOUNDARY ZONE

采用前人的资料,利用理论力学原理分析计算川滇块体的机械能,依据震级和能量关系式,计算块体边界带地震释放的能量,然后对两者的关系进行了分析研究。结果表明块体整体的机械能要远大于边界带地震释放的能量,达到2~3个数量级。探讨了块体边界带50 km及20 km范围内的机械能和地震能量的关系,结果表明块体的形变可能主要集中于边界带20 km范围内。研究结果也印证了川滇块体东南地块的强震周期约为120年,但西北地块的强震周期并不清晰。研究结果也可为研究块体边界带地震提供新的思路。

In this paper,using the data of predecessors,the mechanical energy of Sichuan-Yunnan block is calculated based on the principle of theoretical mechanics.The energy released by the earthquakes at the boundary of the block is calculated based on the equation of magnitude and energy relationship.Then,the relationship between the mechanical energy and seismic energy is analyzed.The results show that the overall mechanical energy of the block is much larger than the energy released by the earthquakes in the boundary band,reaching 2-3 order of magnitudes.The relationship between mechanical energy and seismic energy in the range of 50 km and 20 km in the boundary zone of the block is also discussed.The results show that the deformation of the block may be concentrated on the range of 20 km.The results also confirm that the strong earthquake period of the southeast block is about 120 years,but the strong earthquake period of the northwest block is not clear.