【摘要】 对嘉峪关地震台记录的500个地震逐一分析定位,将本台和中国地震台网中心的定位结果对比,统计平均偏差率。详细计算本台及3个子台的四象限定位结果偏差率,对发生方位偏差的震中位置进行归类研究,寻找规律。研究发现,远震定位结果受台基噪声影响大,近震定位结果受地质构造中断层影响大。应用方位角法定位地震可以最大限度地增加定位准确度,近地震速报时注意肃南区域方位异常的偏差角度,可提供较为准确的地震参数。更多还原

【Abstract】 500 earthquakes recorded by Jiayuguan Seismic Station,that epicenter distance range from100 km to 100 degrees and the epicenter distribution is in four quadrants are chosen in this study.The earthquake are relocated,are.And then this location results are compared with the USGS’s results.The results analyzed shows that the most azimuth deviation is from south-eastern for teleseismic.The main reason is due to the low signal-to-noise ratio.The results of local earthquakes show that the azimuth deviation is also from south-eastern especially Sunan earthquakes.We analyzed the geological structure in this region.Our results suggest that the main reason of azimuth deviation is that the earthquake ray reflecte(or refracted) closer inhomogeneity.This result is benefitable for precise earthquake location in Jayugan station.更多还原