1994年9月16日台湾海峡地震及其构造背景研究

采用宽频带Ｐ波波形资料，利用全局反演方法，推断了１９９４年９月１６日发生在台湾海峡的一次强烈地震的地震矩张量；并采用随机加权方法进行误差分析．结果表明，这次地震的矩张量解以双力偶成分为主，是断层面为ＥＷ走向的正倾错动．震源机制的张应力轴接近水平，ＳＮ走向；压应力轴几乎竖直．地震矩值为０．９８×１０１９Ｎｍ．震源过程的持续时间仅有４ｓ，震源时间函数显示了均匀的单一破裂事件．通过对台湾东南到吕宋岛以北地震带的震源性质分析，探讨了该地区产生ＳＮ向水平拉张应力状态的原因．

STUDY OF THE 16 SEPTEMBER 1994 TAIWAN STRAIT EARTHQUAKE AND ITSTECTONEC SETTING

In this paper we give a detailed study of the 16 September 1994 TaiwanStrait earthquake using the broadband P-wave waveform inversion.A hybridglobal inversion method was used to derive the best-fitting solution of the seismicmoment tensor.The random weighting method was applied to estimate the errorin the best solution.The inversion result shows that this earthquake is a normaldip-slip event with a horizontal tension axis in SN direction and a vertical comression axis.The faulting planes have EW strike.The source time functionindicats a duration of 4s,and a singural uniform faulting process.The origin ofthe horizontal tension stress-pattern in the epicentral region are disscused.