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根据近30年来,我国105°E以东(包括大陆架)M_s≥5.7级地震的震前逐月地温和降水演变特征,可以归纳出震前地气系统演变的共同特征:(1)可将“干热面积”最大月定为孕震3步曲的第一步.未来震级与干热面积有好的相关,最干点的经纬度与震中经纬度有一定的相关;(2)从地温、降水应变波出现到“正多负少”规则恢复可以作为孕震第二步的开始;(3)降水经向波长开始明显变长(甚至变为无限长),可称为孕震第三步,此时距地震发生仅剩0～2个月的时间.外核对流上升体(孕震体)对壳幔层顶托作用的地震成因说,可以较好地解释上述观测事实.
According to the characteristics of the M_s≥5.7 earthquakes east of 105 ° E (including the continental shelf) in the past 30 years, the characteristics of the evolution of temperate precipitation over the pre-earthquake period can be summed up as follows: (1) The biggest month of “dry heat area” is the first step of 3 steps of seismogenic shock.The future earthquake magnitude and dry heat area have a good correlation, the latitude and longitude of the dry point is related to the latitude and longitude of the epicenter; (2) Precipitation strain wave appears to “positive and negative less ” rule recovery can be used as the start of the second step of seismogenic; (3) precipitation meridional wavelength began to significantly longer (or even infinite), can be called pregnant earthquake Three steps, at which time from the earthquake occurred only 0 ~ 2 months time .Exogenous nuclear convection body (pregnant earth body) on the crust and mantle layer supporting the role of earthquake causes, can better explain the above observations.