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
-
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. -
[1] 1 罗焕炎,从大陆地壳动力学观点试论我国地震的成因机制.地震地质,1979, 1 (1)。
2 吴乾蕃,等.山西断陷带地热研究.科学通报,1991, 36 (7).
3 国家地震局《鄂尔多斯周缘活动断裂系》课题组.鄂尔多斯周缘活动断裂系,北京:地震出版社,1988.
4 杨理华,等.华北地区地壳应力场,北京:地震出版社,1980.
5 Roy R. F, et al t Heat genearation of plutonic rocks and continental heat flow provinces, Earth Planet. Sci. Letters, 1968. 5 (1).
6 吴乾蕃,等.华北地热场研究.中国地震,1988, 4 (1).
7 Subbotin S. I. et. al,Structure of the Earth's Crust and Upper Mantle,Tectonophysics,1965,2 (2).
8 吴乾蕃,等.华北大地热流与地震活动性,现代地壳运动研究。1985, (1)
9 张菊明,等.有限单元法在埤热研究中的应用,北京:科学出版社,1986, 15—36.
10 Pllack,R. N, 1977, On the Regional variation of heaf flow, Geotherms and lithosperic thickness, Tectono-physics, Vol. 38, No. 3.
11 吴乾蕃,等.云南地区地热基本特征.地震地质,1988, 10 (4).
12 刘锁旺,等.汾渭裂谷系.地壳形变与地震,1981, (3).
13 Warren N. W, 1970, An expermental study of thermally indrced microfracturing and its relation to volcanic seismicity,J. Geophys, Res,Vol. 75,No. 23.
14 吴乾蕃.松辽盆地地热场,地震研究,1991,14 (1).
15 安镇文,等.地热异常与地震孕育和发生的关系.地震研究,1985, 8 (4).
16 吴乾蕃,等.我国第5号地学断面的大地热流研究。科学通报,1990, 35 (2).
17 邓起东,等.山西隆起区断陷地震带地震地质条件及地震发展趋势概述,地质科学1973, (1).
18 竽克昌,等.云南地区断块结构与强烈地震,地震研究,1979, (1).
19 吴乾蕃.松辽盆地地温场与油气生成、运移、富集的关系.石油学报,1990, 11 (1).
20 Stegens L, 1982,Geothermics and seismicity,Earthquake Prediction Research, Vol. 1,No, 4.
21 安镇文,等.地热与地褽关系研究(一)——弹性介质中椭圆盘状裂纹尖端附近的热应力分布.地震学报, 1984, 6 (6). -

计量
- 文章访问数: 1281
- HTML全文浏览量: 220
- PDF下载量: 186