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
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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.
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.
引文
陈运泰.1999.集集大地震对防震减灾的启示[R].地震科技委论坛
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Huang B S,Chen K C,Wang K L et al.1998.Velocities of Pn-Waves in the Tai wan Strait and Its Surrounding Area FromRegional Earthquqkes[J].TAO,9(3):473~486
Kao Honn,Angelier,Jacques.2001.Stress Tensor Inversion for the Chi-Chi Earthquake Sequence and its I mplication onRegional Collision[J].BSSA,91(5):1028~1040
Ma Kuo-Fong,Song Der-Ru.1997.Velocity and Moho Depth in Tai wan[J].Journal of The Geological Society of China,40(1):167~184
Shin Tzay-Chyn,Teng Ta-liang.2001.An Overviewof the1999Chi-Chi,Tai wan Earthquake[J].BSSA,91(5):895~913
范玉兰,林纪曾.1990.华南地区地震走时表的研制[J].华南地震,10(2)
付淑芳,刘宝诚,李文艺编.1980.地震学教程(下册)[M].北京:地震出版社,4~5
何玉梅,姚振兴.2002.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,45(5):638~645
林仙坎.2004.关于网外地震的定位问题[J].中国地震,20(3):276~284
许力生,G Patau,陈运泰.2002.用余震作为经验格林函数从GDSN长周期波形资料中提取1999年集集地震有震源时间函数[J].地震学报,24(2):113~125
王卫民,姚振兴.2003.用转换函数的方法研究台湾地区三维深部结构[J].地球物理学报,46(5):628~633
曾融生,师浩珊.1978.1974年5月10日云南省永善———大关主震的多重性[J].地球物理学报,21(2):160~173
[澳]布伦著,朱传镇,李钦祖译,傅承义校.1965.地震学引论[M].北京:科学出版社,99~100
Huang WG,Wang J H et al.2001.Esti mates of Source Parameters for the1999Chi-Chi,Tai wan,Earthquake Based onBrune′s Source Model[J].BSSA,91(5):1190~1198
Hwang Ruey-Der,Wang Jeen-Hwa et al.2001.Esti mates of Stress Drop of the Chi-Chi,Tai wan,Earthquake of20September1999from Near-Field Seismograms[J].BSSA,91(5):1158~1166
Huang B S,Chen K C,Wang K L et al.1998.Velocities of Pn-Waves in the Tai wan Strait and Its Surrounding Area FromRegional Earthquqkes[J].TAO,9(3):473~486
Kao Honn,Angelier,Jacques.2001.Stress Tensor Inversion for the Chi-Chi Earthquake Sequence and its I mplication onRegional Collision[J].BSSA,91(5):1028~1040
Ma Kuo-Fong,Song Der-Ru.1997.Velocity and Moho Depth in Tai wan[J].Journal of The Geological Society of China,40(1):167~184
Shin Tzay-Chyn,Teng Ta-liang.2001.An Overviewof the1999Chi-Chi,Tai wan Earthquake[J].BSSA,91(5):895~913
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