CAJ | 학술논문

对2001～2006年兰州-天水-武都地区5期重力场时变资料进行小波分解,结合2003年11月岷县5.2级地震、2004年9月岷县5.0级地震以及2006年6月武都、文县间5.0级地震进行分析.探讨了无震年份、有震年份及较长时段的重力场时变资料小波分解结果与地震活动之间的关系,结果表明:用小波分解方法可有效分离重力场时变的不同波长成分;该地区不同层次的重力场时变异常反映了一定尺度意义上不同深度的介质密度的动态变化分布,说明兰州-天水-武都地区中深部地质构造活动所引起的重力异常变化的2阶、3阶小波细节对2003、2004、2006年3次M_S≥5.0地震反应明显.
대2001～2006년란주-천수-무도지구5기중력장시변자료진행소파분해,결합2003년11월민현5.2급지진、2004년9월민현5.0급지진이급2006년6월무도、문현간5.0급지진진행분석.탐토료무진년빈、유진년빈급교장시단적중력장시변자료소파분해결과여지진활동지간적관계,결과표명:용소파분해방법가유효분리중력장시변적불동파장성분;해지구불동층차적중력장시변이상반영료일정척도의의상불동심도적개질밀도적동태변화분포,설명란주-천수-무도지구중심부지질구조활동소인기적중력이상변화적2계、3계소파세절대2003、2004、2006년3차M_S≥5.0지진반응명현.
In this paper,we adopt wavelet analysis method to separate different components with different wave length of gravity changes in Lanzhou-Tianshui-Wudu area from 2001 to 2006.The gravity changes were related to the recently-occurred earthquakes,such as M_S5.2 Minxian Earthquake on November 2003;M_S5.0 Minxian Earthquake on September 2003,M_S5.0 Wudu-Wenxian Earthquake on June 2006.Then we discuss the relationship between gravity variations,earthquake activities and tectonic activities.The results show that we can distinguish different gravity changes with different wavelet components by wavelet decomposition,among which 2-order and 3-order wavelet decomposition parts can expose the middle and deep geological and tectonic activities.