CAJ | 학술논문

根据四分量钻孔应变观测的弹性理论模型，四个分量的观测值 S1、S2、S3、S4之间存在“自洽方程”：S1＋S3＝S2＋S4。“十五”期间新建的“数字地震观测网络工程”四分量钻孔应变观测系统中已有一批台站，无论是几天的短期数据，还是6年以上的长期数据，两组面应变相关系数 k 值都超过了0．99。k 值不受降雨、河湖水位、机井抽水等外界干扰影响，具有稳定性。但姑咱台和昭通台，分别在汶川8．0级、鲁甸6．5级和康定6．3级地震前，观测到了 k 值发生明显变化即数据自洽性遭到破坏的现象。导出自洽方程的条件是安装应变仪钻孔附近岩石完整及应力源与观测点间介质的连续性要求，由此，作者认为，姑咱台和昭通台面应变相关系数发生变化可能由于台站附近发生的大地震的地震成核过程中震源区地层介质连续性逐渐受到破坏所致。
근거사분량찬공응변관측적탄성이론모형，사개분량적관측치 S1、S2、S3、S4지간존재“자흡방정”：S1＋S3＝S2＋S4。“십오”기간신건적“수자지진관측망락공정”사분량찬공응변관측계통중이유일비태참，무론시궤천적단기수거，환시6년이상적장기수거，량조면응변상관계수 k 치도초과료0．99。k 치불수강우、하호수위、궤정추수등외계간우영향，구유은정성。단고찰태화소통태，분별재문천8．0급、로전6．5급화강정6．3급지진전，관측도료 k 치발생명현변화즉수거자흡성조도파배적현상。도출자흡방정적조건시안장응변의찬공부근암석완정급응력원여관측점간개질적련속성요구，유차，작자인위，고찰태화소통태면응변상관계수발생변화가능유우태참부근발생적대지진적지진성핵과정중진원구지층개질련속성축점수도파배소치。
tion,there exists a “self-consistent equation”:S1+S3=S2+S4 for S1,S3,S2,S4.Many four component borehole strain observation stations have correlation coefficient k of two groups of plain strain values more than 0.99 whether it is for short term of several days or for long-term of more than 6 years.Coefficient k is not affected by external interference.But at Guzan station and Zhaotong station,before the Wenchuan M8.0,Ludian M6.5 and Kang-ding M6.3 earthquakes,we have observed the plain strain correlation coefficient k varied ob-viously.The self-consistent equation rely on the medium continuity between strain source and the observation point,therefore,the authors think,this significant strain correlation co-efficient changes was due to gradual damage of earthquake source region stratum for the earthquake nucleation process.