南阳淅川喀斯特地貌区地震记录特征

The earthquake record characteristic of karst landform area in Xichuan of Nanyang

分析河南测震台网记录的南阳淅川喀斯特地貌地区地震波形特征,从初动方向、AS/AP振幅比、反射波PmP与Pg到时差、直达波Pg视速度,与河南省汝阳矿区工程爆破记录波形进行对比分析,发现二者波形特征较为相似,但喀斯特地貌地区地震仍具有典型地震特征,如:初动方向呈四象限分布,振幅比远大于3,反射波记录较弱,Pg波视速度较高。

The seismic waveform characteristics of karst landform area in Xichuan Nanyang by the seismic network of Henan are analyzed in this paper. Besides, the first motion, the AS/AP ratio, the time difference of the reflection PmP and the apparent velocity of Pg and Pg wave of the blasting record waveform in Ruyang mining area of Henan province were prepared with the seismic waveform of karst landform area. Although the characteristics of the seismic waveform of karst region is relatively similar to the blasting record waveform, some typical seismic features are obviously different. For example, the first motion direction distribution is four quadrant, the amplitude ratio is more than 3 and the weak records of reflection wave together with the higher seismic Pg wave apparent velocity.