用地震定位的方法研究1999年9月21日台湾省集集地震的破裂过程  

Research of rupturing process by use of location method for Chi-Chi Earthquake of Taiwan Province

作　　者：林仙坎[1] 

机构地区：[1]福建省地震局,中国福州350003

出　　处：《地震地磁观测与研究》2007年第1期23-29,共7页Seismological and Geomagnetic Observation and Research

摘　　要：综合分析了福建数字地震台网的记录特征,认为台湾省集集地震具有多重破裂的特征。根据Pn震相的走时方程构造出双曲线方程组,利用福建台网记录到的Pn波段震相的到时资料,测定了9.21台湾省集集地震8个破裂点的震中位置。结果表明,集集地震的最初破裂点位于23.94°N,120.77°E;接着破裂向初始破裂点的南北两侧扩展,且北侧的振幅大,整个过程至少持续了20s;这8个破裂点的位置几乎成一直线排列,其方向与该区地块的运动方向相近。The complexity of waveform recorded at Fujian digital seismological network for Chi-Chi Earthquake（1999-09-21） of Taiwan Province is analyzed. Author has recognized that there are the characteristics of source multiplicity. Author constructed a hyperbola equation from Pn travel-time, and determined the locations of 8 rupturing points of Chi-Chi Earthquake. The results show that the original rupturing point location at 23. 94°N, 120. 77°E; then the rupturing spread in northern and southern directions, and the swing degree in northern side is larger than in south, and at least the duration time of process is 20 s; the arrange of 8 points is about straight line, and its direction is approximately with the direction of the block movement.

关 键 词：福建台网Pn记录 双曲线走时方程组 集集地震 多重破裂 地块运动 

分 类 号：P315.2[天文地球—地震学]