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海南东北部地区地壳地震各向异性特征初步研究
张慧
海南省地震局,海口市美苑路49号 570203
摘要:
基于海南省地震台网2000~2013年的区域地震波形数据,用剪切波分裂系统分析方法(SAM)获得了海南琼东北部地区“九五”数字台网中2个台站的剪切波分裂参数。结果表明,快剪切波偏振优势方向代表了原地最大主压应力方向。七星岭台NE方向的快剪切波偏振优势方向与区域水平主压应力场方向不一致,与NE走向的断裂一致,体现了局部构造和局部应力场的复杂性;青山岭NNE向的快剪切波偏振优势方向揭示了NNE走向断裂的构造意义。同时,本研究证实,位于活动断裂上或几条活动断裂交汇部位的台站的快剪切波偏振优势方向,与对所选用的小地震起控制作用的活动断裂走向一致,并且快剪切波偏振优势方向较为离散,反映了该区域复杂的断裂构造和应力分布特征。
关键词:  地震各向异性  剪切波分裂  主压应力  活动断裂  海南东北部
DOI:
分类号:
基金项目:
Preliminary Study on Seismic Anisotropy in the Crust in the Northeast of Hainan
Zhang Hui
Earthquake Administration of Hainan Province,Haikou 570203,China
Abstract:
With SAM shear-wave splitting analysis,shear-wave splitting parameters at two stations of the digital seismic network in the northeast of Hainan are obtained based on the data from the Hainan Digital Seismic Network from 2000 to 2013. The results show that the predominant polarization direction of fast share-wave represents the direction of in-situ maximum principal compressive stress. The predominant polarizations of Qixingling (QXL) seismic station are in the NEE direction,which is different from the direction of principal compressive stress of the Hainan area,but same as the strikes of faults in the NE direction,which means that the local tectonics and stress fields are complicated. The predominant polarization of Qingshanling ( QSL ) seismic station is in the NNE-NS direction,which indicates the tectonic significance of the strikes of NNE-trending faults. At the same time,the study confirms that the predominant polarizations of the stations located on active faults or at the junctions of several active faults are parallel to the strikes of faults which control the earthquakes used in this analysis,and the predominant polarizations are scattered,which indicates the complicated background of fault structures and stress distribution.
Key words:  Seismic anisotropy  Shear-wave splitting  Principal compressive stress  Active faults  Northeast of Hainan