基于片法对地震低活动水平区域的构造分布特征研究

文中应用片法研究了首都圈地区在39.8°～40.4°N和114.0°～115.0°E范围内的地震活动分布。 片法主要是针对地震活动分布比较稀疏、断层无法直观识别的地区,用空间扫描的方法,并结合相应的统计检验方法,来评价地震震中分布的线性特征是否显著,从而进一步识别地震断层。 该文选定的研究区域,在过去30多年的时间里共发生了1.0～5.0级地震906次,地震的活动不活跃比较符合片法的应用研究。 将该方法用于所选定区域地震数据的研究表明,其识别能力还是较好的,可以整体上刻画比较真实的地质构造特征。 对由于种种原因无法进行实测,且地震活动较低的构造区域,片法是分析其构造分布的有效补充。

Study of Tectonic Distribution Characteristics in Low-level Seismicity Region Using Blade Method

The blade method was applied in the paper to research seismic distribution in the selected capital region(114.0°~115.0°E, 39.8°~40.4°N). The blade method is specified for the tectonic regions, where earthquakes distribute sparsely and the distribution of the faults can't be noticed intuitively. Combined with some statistic method and spatial scanning method, the blade method can be used to assess the linear distribution of earthquakes and further detect the faults. In the region selected there occurred only 906 earthquakes between M1.0 to M5.0 in the past 30 years, therefore, it is appropriate for applying the blade method. According to the result the identified lines through blade method can basically describe the regional tectonic setting.