Stress and Tilt Induced by Annual Variation of Surface Temperature
Received date: 2004-09-21
Revised date: 2004-11-03
Online published: 2005-05-15
曹建玲 , 石耀霖 . 地表温度年变化对地应力和地倾斜的影响[J]. 中国科学院大学学报, 2005 , 22(3) : 303 -308 . DOI: 10.7523/j.issn.2095-6134.2005.3.007
Strain and tilt measurements are thought to be important methods to find precursors in the earthquakePrediction. It is cnrcial to distinguish the noise from tectonic signals. The temperature variation of earth surfazeechanges the temperature of the subsurface. Hence the stress field is affected and the deformation of the ground isproduced. In present work, finite element techniques are employed to study the effect of annual temperaturevariation, when czunplex landfonn 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, mayproduce 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 variationand other noise effects when measurement sites are chosen.
Key words： stress; tilt; annual variation; finite-elanent
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