银川台灵武地震记录特征分析

CRARACTERISTICS ANALYSIS OF LINGWU EARTHQUAKE RECORDING AT YINCHUAN SEISMOLOGIC STATION

本文对1984年9月以来银川台记录到的灵武吴忠地区M_L≥3.0级地震波形进行了对比分析。结果发现,银川台记录该区域地震有明显的地区特征,主要有PG波初动方位异常;东西向到时滞后,周期偏小;震源出射角偏大;PG波初动记录显著;能记到近距离反射波等,并对此进行了必要的讨论。

This paper analyses and compares the M_L≥3.0 seismic waveform of Lingwu and Wuzhong districts recorded at Yinchuan seismologic station since in September, 1984. It shows that the recording in this station has obvious regional characteristics,including anomaly of PG wave initial motion, arrival time hysteresis in west and east directions, periodic reduction, angle of departure at earthquake source increase, obvious initial motion of PGwave and recording reflected wave at short distance ere. The author makes a necessary discussion on those characteristics.