北天山地震活动区地热信息的观测与研究

GEOTHERMAL INFORMATION OBSERVATIONS IN NORTH TIANSHAN SEISMIC ACTIVE ZONES

１９８９年以来，在北天山重点监视区设立了６个地热观测站（３个热水井，３个温泉），采用分辨率为０．０００１℃，精度为±０．００５℃的石英数字温度计连续记录水温的动态变化。观测结果表明：水温有两类正常动态类型，即稳定动态和年周期动态。４次中强地震前后水温出现明显的异常变化，震后变化更为剧烈。地热前兆异常形态各异，因井泉不同而不同。认为，深入研究活动断裂带和地热异常区的热信息不仅对寻找地震前兆，而且对地震危险区判定具有重要作用。

Six geothermal information observation stations(among them,three for thermal wells,and three for springs)have been installed in North Tianshan principal monitoring area since 1989,by means of quartz digital thermometer for continuous recording the dynamic variation of water temperature with resolution 0. 0001C,precision±0.005 C.It is shown through observation that water temperature usually has two kinds of normal dynamic changes,i.e.stable dynamics and yearly periodic dynamics. Before and after 4 times of moderate strong eartquakes,water temperature had obvious abnormal patterns and getting more sharp after shocks. As geothermal precursory abnormal patterns are changable due to different wells and springs.It is believed that making further studies in geothermal information from active fracture zones and geothermal abnormal areas will be of importance not only in seismic precursory researches.,but also in seismic risk region recognition.