都兰台深井地温的同震变化研究

Study on coseismic variation of deep well ground temperature in Dulan seismic station

通过对2013年6月1日以来全球M_S≥7.0、国内M_S≥5.0地震时都兰台深井地温观测数据的变化进行研究发现,8次中强以上地震时有明显的同震变化反应。其中,地温同震变化的幅度与地震波的最大振幅,特别是与水平向合成最大振幅有较好的正相关关系。地温同震变化的形态与地震发生所处的构造位置有关,当地震与井孔所处位置有直接的构造联系且震级较大时,同震变化形态为下降—转平,其他地区的地震则为下降—回升形态。同时,对地温的同震变化机理进行了探讨,认为地温的同震变化可能是由地震波携带的能量引起井孔周边热力场变化所致。

We study the variation patterns of geothermal observation data at Dulan seismic station,in a range of global earthquake with Ms ≥ 7.0 and domestic earthquake with Ms ≥ 5.0 since June 1,2013,and find that 8 moderately strong earthquakes have obvious coseismic changes of reaction.Among them,the amplitude of coseismic variation is positively correlated with the maximum amplitude of seismic wave,especially with the maximum amplitude of horizontal synthesis.The morphology of coseismic variation is related to the tectonic location of the earthquake.When the location of the earthquake is directly related to the location of the borehole and the magnitude is larger,the pattern of the coseismic change is decline-flat,and the other regions of the earthquake are the decline and recovery.At the same time,the change mechanism of coseismic variation of ground temperature is discussed,and it is considered that the coseismic variation of geotemperature may be caused by the thermal energy field,which is resulted from the energy of seismic wave.