2003年新疆石河子5.4级地震序列重新定位及发震断层与机制分析
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摘要
利用双差地震定位法对2003年2月14日石河子5.4级地震及其余震进行重新定位。定位结果显示,石河子地震及其余震呈N40°E方向线性展布,与准噶尔南缘断裂近乎垂直;震源深度全部分布在15~30 km范围内,优势分布为15~25 km。石河子5.4级地震震中位置为44.001395°N,85.872175°E,距离新疆地震局测得的震中位置仅1.2 km,而距离宏观考察的震中位置约49 km。分析重定位结果其震源机制解得出,这次地震的发震构造是准噶尔南缘断裂,而不是宏观考察的以连哈比尔尕山断裂;节面Ⅰ是主破裂面,而且其走向与重定位地震序列的展布方向基本一致。
The Shihezi M5.4 earthquake on Feb.14,2003 and its aftershocks are relocated by double different location algorithm.The result shows that the earthquake and aftershocks distribute along N40°E,nearly vertical with the Zungger south-margin fault,that the focal depths vary ranging from 15 to 30km,and with an advantage range of 15-25km.The Shihezi earthquake is relocated at 44.001395°N,85.872175°E,only 1.2km to the epicenter located by the Earthquake Administration of Xinjiang,but 49 km from the macro-epicenter.Based on the relocation results and focal mechanism analysis,it is thought that the causative fault is the Zungger south-margin fault instead of the Yilianhabierga Mountain fault from macroscopic survey,furthermore,the main rupture surface is the surface Ⅰ with a strike basically consistent with the distribution of the relocated earthquake sequence.
The Shihezi M5.4 earthquake on Feb.14,2003 and its aftershocks are relocated by double different location algorithm.The result shows that the earthquake and aftershocks distribute along N40°E,nearly vertical with the Zungger south-margin fault,that the focal depths vary ranging from 15 to 30km,and with an advantage range of 15-25km.The Shihezi earthquake is relocated at 44.001395°N,85.872175°E,only 1.2km to the epicenter located by the Earthquake Administration of Xinjiang,but 49 km from the macro-epicenter.Based on the relocation results and focal mechanism analysis,it is thought that the causative fault is the Zungger south-margin fault instead of the Yilianhabierga Mountain fault from macroscopic survey,furthermore,the main rupture surface is the surface Ⅰ with a strike basically consistent with the distribution of the relocated earthquake sequence.
引文
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