Abstract: This paper deals with instable temperature field caused by thermal events and demonstrates that abnormal temperature distributions and heat flow values depend on the event parameters such as intensity,life-span and time it occurred.Comparing some theoretical results with observation data,it is found that the passive block and the active region are different in thermal processes and that the differential depth of low-velocity layers/low-resistivity layer between the crust and upper mantle is correlative with thermal-activation processes.The differential depth between the two layers ranges from 40km to 60km for the North China plain,suggesting a therml event of about 50—70m.y., and a duration of about 30—40m.y.,while for the Yin Chuan basin,it ranges from 36km to 40km,suggesting a thermal event of 30—40 m.y..Generally,the effects of thermal events which occurred more than 100m.y.ago can be neglected and the temperature field can be regarded as the stable.The method based on stable temperature field to determine structures of crust and upper mantle is only suitable to passive blocks.

摘要： 本文计算并讨论了当地球内部有热脉动事件发生时非稳态的热作用模型及其对地热场和大地热流的影响。理论计算和实际资料表明,构造活动区和稳定地区应有不同的热作用过程,在构造活动区地壳内的低速,低阻层和上地幔的低速,低阻层的埋藏深度之差与该地的热活动史有一定的对应关系。如华北平原地区,观测的二层深度差为40—60公里,推测热脉动持续时间为40百万年,活动史为50—70百万年:而银川盆地二层间隔为36—40公里,活动史为30—40百万年。