CAJ | 학술논문

对民乐 M 6.1地震前4年河西地区重力场变化进行小波分解，结果表明：重力异常变化一阶小波分体呈现随机性与局部性，反映浅层和局部质量变化引起重力变化；二阶小波分解与地质结构一致，反映断层活动引起的重力变化；三阶小波分解结果表明，在民乐 M 6.1地震前，重力显著改变，显示深部物质状态发生变化是引起此次地震发生的重要因素；四阶小波分解反映深部物质状态引起重力变化，对此次民乐 M 6.1地震反应不明显。地震发生后，震区构造活动减弱，各阶小波分解对地震反应不明显。
대민악 M 6.1지진전4년하서지구중력장변화진행소파분해，결과표명：중력이상변화일계소파분체정현수궤성여국부성，반영천층화국부질량변화인기중력변화；이계소파분해여지질결구일치，반영단층활동인기적중력변화；삼계소파분해결과표명，재민악 M 6.1지진전，중력현저개변，현시심부물질상태발생변화시인기차차지진발생적중요인소；사계소파분해반영심부물질상태인기중력변화，대차차민악 M 6.1지진반응불명현。지진발생후，진구구조활동감약，각계소파분해대지진반응불명현。
In this paper,the gravity field variation in Hexi area four years before Minle M6.1 earthquake was decomposed by wavelet method,and the results show that: The locality and randomness do exist in the first-order wavelet decomposition of the gravity field variation in Hexi Corridor,which mainly reflects that the gravity field variation was caused by mass change of the shallow layers and local areas; The second wavelet transformation is consistent with the geological structure, which mainly reflects the gravity field variation caused by fault movements in Hexi Corridor; The third wavelet transformation shows significant gravity variation in Minle area before the M 6.1 earthquake,which indicates that the middle-deep layer material density change is closely related to the earthquake; The fourth wavelet transformation which reflects the deep layer material density variation of the earth has no obvious variations during the earthquake. After the earthquake,the geological structure movements in Minle area relatively decreased,and every order of wavelet decomposition results have no obvious variations.