天水地震区深部地温场的有限元计算
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摘要
用有限元方法计算了天水地震区上地壳地温场。结果表明,影响该区浅部(层)地温场的主要因素是基底构造和断裂构造。祁连褶皱系为高热异常区,秦岭褶皱系为低热异常区,西秦岭北缘断裂带为地温梯度带。认为该带历史地震的发生与热应力差有关
The geotemperature field of upper crust in Tianshui earthquake area is calculated by using finite element method. The results show that basement and fault structures are main factors affec ting shallow geotemperature field in this area.Qilian fold system is a high geothermal anomaly area, whereas Qinling fold system, low geothermal anomaly area. And the fault zone along the north edge of West Qinling mountains is a zone with high geothermal gradient.It is considered that the occurrence of historical earthquakes in this zone is related to thermal stress difference.
引文
1黄汲清,等.中国大地构造及其演化.科学出版社,1983.2熊亮萍,等.区域构造形态对地温场影响的有限单元法计算.地球物理学报,1983,26(增刊).3张菊明,熊亮萍.有限单元法在地热研究中的应用.北京:科学出版社,1986.4张生源,谢原定.天水地震区浅层地质构造,西北地震学报,1991,13(增刊):22-28.5梁中华,等.天水地震区浅层地壳速度构造.西北地震学报,1991,13(增刊):16-21.6董治平,等.甘肃省第一批实测大地热流数据.甘肃科学学报,1992,4(3).7张必敖,等.南北地震带北段地温场的初步探讨.西北地震学报.1987,9(1):26-32.

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