【摘要】 利用有限元方法 ,对存在复杂地形时 ,气温变化的影响深度 ,及造成的地应力和地倾斜变化的量值进行了估算 .计算结果表明 ,地形造成的热汇聚和热发散会造成地下温度的不均匀分布 ,而不均匀的热胀冷缩会导致地应力和地倾斜复杂变化 ,其影响深度大于平地温度年变化涉及的深度 .在地应力和地形变台站的选址和观测中应该注意气温年变化影响及其干扰排除问题 .更多还原

【Abstract】 Strain and tilt measurements are thought to be important methods to find precursors in the earthquake prediction. Its crucial to distinguish the noise from tectonic signals. The temperature variation of earth surface changes the temperature of the subsurface.Hence the stress field is affected and the deformation of the ground is produced. In present work, finite element techniques are employed to study the effect of annual temperature variation, when complex landform exists. The depth concerned and the magnitude of stress and tilt are evaluated. The results show that: thermal convergence and dispersion caused by topography, which is similar to light, may produce the non-uniformity of temperature distribution. The temperature anisotropy affects the stress field and tilt. The depth concerned is larger than that of temperature. Attention should be paid to the annual temperature variation and other noise effects when measurement sites are chosen.更多还原