中国地震台网初至P波区域三维走时表的建立  

Construction of regional three-dimensional travel-time tables of first P arrival for China Seismograph Network

作　　者：梁建宏[1] 韩雪君[1] 孙丽[1] 梁姗姗[1] 张雪梅[1] 

机构地区：[1]中国地震台网中心,中国北京100045

出　　处：《地震学报》2015年第1期125-133,205,共9页Acta Seismologica Sinica

基　　金：国家自然科学基金项目(41274062);测震台网青年骨干培养专项(20120101)共同资助

摘　　要：基于LLNL-G3Dv3全球P波三维速度模型,应用FMM软件包计算并建立了中国地震台网990个台站的初至P波区域三维走时表.该走时表覆盖了以台站为中心的水平向20°×20°、垂直向-5.1—80 km(向下为正)的三维空间.其水平向间隔为0.2°,垂直向间隔为5 km.这样对于任一深度小于80 km的震源,均可以应用此三维走时表计算其到周围10°范围内台站的走时.中国地震台网初至P波区域三维走时表的建立,对于改善区域初至P波走时预测,提高地震定位精度有一定现实意义.Abstract： Based on the global-scale three-dimensional P wave velocity model LLNL-G3Dv3, regional travel-time table of first P arrivals of 990 seismic sta- tions of China Seismograph Network is calculated and constructed by using FMM software package. The table covers the station-centered area with 20° multiply 20° in horizontal direction and --5.1 km to 80 km in vertical direction. The horizontal interval of travel-time table is 0.2° and the depth interval is 5 kin. Accordingly, travel-times can be calculated within the distance of 10° for any source with depth less than 80 km. As a consequence of the construction of the regional three-dimensional first P arrival travel-time table, the prediction of first P arrival time would be much more improved, and it is significant for im- proving earthquake locations.

关 键 词：中国地震台网 P波 三维速度模型 走时表 建立 

分 类 号：P315.31[天文地球—地震学]