【摘要】 利用射线追踪方法对新疆伽师地区的重复地震进行位置归一处理,提高走时精度以达到观测伽师—乌恰和伽师—阿合奇地区地壳介质变化的目的。计算了伽师地区2005年1月至2011年3月ML≥2.5重复地震序列经射线追踪和波形互相关方法校正后的P波走时差。结果显示,在2009年2月20日柯坪5.4级地震前阿合奇台的记录观察到该地区短期的地壳介质速度明显升高现象,2010年6月10日乌恰5.2级地震前乌恰台也同样记录观察到该现象。更多还原

【Abstract】 This article applied ray tracing method to normalize location of repeating earthquakes in Jiashi region,Xinjiang,and improve travel-time precision to observe variation of crustal medium in Jiashi-Wuqia region and Jiashi-Aheqi region.They calculated the travel-time difference of P wave using ML≥ 2.5 repeating earthquake sequence corrected by ray tracing and waveform correlation method from Jan,2005 to March,2011 in Jiashi region.The result showed that the crust velocity apparently increased in this region before Keping earthquake with MS5.4 on February 20th,2009 recorded by Aheqi station.Such phenomenon also was observed before Wuqia earthquake with MS5.2 on Jun 10th,2010 recorded by Wuqia station.更多还原