嘉峪关地震台地震定位方位偏差研究
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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。
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.
引文
董治平,张元生.河西走廊中部地区三维速度结构研究[J].地球学报,2007,3:270.
    董治平,张元生.阿拉善地块下插河西走廊的发现及其构造意义[J].甘肃科学学报,2007,1:91
    和跃时.利用数字地震记录计算震中方位角方法简介[J].东北地震研究,2004,1:48.
    赵仲和.地震自动定位的综合解决方案[J].地震地磁观测与研究,2005,26(1):50.
    周彦文.基于单台P波记录的快速自动地震定位方法研究[J].地震研究,2010,2:183.
    朱宗德.嘉峪关台地震方位异常的初步探讨[J].高原地震,1999,4:46.
    朱元清,赵仲和.提高地震定位精度新方法的研究[J].地震地磁观测与研究,1997,18(5):59.

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