云南地震活动与岩石圈热结构的关系  

Relationship between Seismicity and Geothermal Structure of the Lithosphere in Yunnan Province, China

作　　者：向才英[1] 周真恒[1] 

机构地区：[1]云南省地震局,中国昆明650041

出　　处：《中国地震》2000年第3期263-272,共10页Earthquake Research in China

基　　金：云南省中青年学术和技术带头人培养经费;云南省自然科学基金!(97D0 21G;96D115Q)资助

摘　　要：利用云南及邻区的大地热流测值和估算值资料编制了云南大地热流等值线图。大地热流与强震 ( 886～ 1998年 )震中、地温分布与精度较高的震源深度资料 ( 1983～ 1997年 )的对比研究表明 :云南强震主要发生于热应力集中的地热梯级带 ;震源一般位于 10 0～ 60 0℃等温线间 ,相当于 3～ 2 5km深度 ,并密集分布于 2 0 0～ 4 50℃等温线间 ,即 5～ 2 0km深处。The isoline map of the heat flow has been drawn by using the measured and estimated values of the heat flow in Yunnan Province and its adjacent region. The contrast studies of the heat flow and epicenters of the strong earthquakes (886～1998),the distribution of the geotemperature and high accurate data of focal depth (1983～1997)show that the strong earthquakes take place at the geothermal gradient zone in which the thermal stress concentrates, and that the foci are generally located between 100℃ and 600℃ isogeotherms corresponding to the depths of 3～25 km and densely distribute between 200℃ and 450℃ isogeotherms, i.e. the depths of 5～20 km. The distrbutional range of the focal depths is probably related to the crustal brittle to ductile transition which mainly results from the geotemperatures.

关 键 词：地震活动 大地热流 地温分布 岩石圈 热结构 

分 类 号：P315.72[天文地球—地震学]