山西断陷带地热特征与地震活动性
THE GEOTHERMAL FIELD CHARACTERISTICS AND SEISMIC ACTIVITIES IN SHANXI FAULT DEPRESSION AREA
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摘要: 山西断陷带是我国著名的地震活动带之一,其地震活动频繁,强度大,震源浅,破坏性严重。山西断陷带地热场特征:各断陷盆地内部大地热流值或地温梯度值都比较高,吕梁山隆起区和太岳山丘陵区则比较低。提出清徐、临汾、蒲县、柳林四个地区的地壳、上地幔热结构,分别计算沉积岩层、花岗岩质层和玄武岩质层底部的温度和热流值。采用逐步逼近法计算浮山—临汾—蒲县剖面二维岩石圈地温结构。并用断陷盆地内的临汾、吕梁山隆起区的柳林、太岳山隆起区的沁源地区的大地热流值推导其岩石圈厚度和底部温度。地热异常影响着地震的孕育和发生,重点探讨了地球内热与地震孕育和发生的内在联系。Abstract: The Shanxi fault depression area is one of the seismic activity belts in China.It is famous for its frequently seismic activities, shallow focal depth and high intensith.The geothermal field characteristics in Shanxi fauit depression area are as follows: In each fault depression basin, the values of terrestrial heat flow and geothermal gradient are higher than the averages of these regions.But in Luliangshan Mountain region and Taiyueshan rolling country, the values are lower.
In the regions of Qingxu, Linfen,Puxian and Liulin,the thermal struture of crust and upper mantle has been suggested.The temperature and heat flow values at the bottm part of sedimentary, granitoids and basalt layers have been estimated to model the two-dimension lithosphere temperature structure of Fushan-Linfen-Puxian geological trannsection.By means of the terrestrial heat flow at Linfen (in the depression basin), Liulin (in the moumtain region) and Qingyuan (in the rolling conuntry), the lithosphere's thichness and bottom temperatuer of these regions have been derived.The geothermal abnormality influences the preparatory process and occurrence of earthquakes.In this paper, the emphasized discussion is on their internal relations. -
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