青藏高原北缘P波波形线性度的动态跟踪及其变化的物理机制初探  

PRELIMINARY RESEARCH ON DYNAMICALLY TRACING FOR LINEARITY OF P WAVE FORMS IN NORTH BORDER OF Qin Zang LATEAU AND PHYSICAL MECHANISM OF ITS CHANGE

作　　者：闵祥仪[1,2] 盛国英[1,2] 冯德益[1,2] 孟亚军[1,2] 

机构地区：[1]国家地震局兰州地震研究所 [2]天津市地震局

出　　处：《地震学刊》1996年第4期1-5,共5页Journal of Seismology

基　　金：国家自然科学基金

摘　　要：利用数字化近震Ｐ波波形资料，追踪研究了青藏高原北缘１９９０年２月～１９９５年８月Ｐ波波形时间线性度的变化过程。发现该区较大地震发生前线性度有一定程度的下降现象。分析认为：大震前孕震区应力场的不均匀分布可使通过孕震区及其周缘的地震波产生频散。The change process of time linearity of P wave forms in north border of Qin Zang Plateau from Feb. 1990 to Aug. 1995 had traced and researched using the numeral records for P wave forms of near earthqnakes.It is shown that the linearity decreases to some extent before the large earthquake of the region.Analysis indicates physical essence of the decrease of the linearity is that the heterogeneous distribution of stress field in seismogenetic area can cause the dispersion of seismic wave propagated through the focus and adjacent area

关 键 词：青藏高原 地震波 波形分析 线性度 动态跟踪 

分 类 号：P315.3[天文地球—地震学]