【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.更多还原

【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 stations 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 5km.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 improving earthquake locations.更多还原