基于云南宾川气枪主动源激发实验数据，对气枪震源水中能量辐射特性进行了分析研究，得到了气枪震源水中激发脉动气泡周期和最大半径的经验计算公式。结果表明：①气枪震源的能量辐射效率在垂直向下方向要高于水平方向；②垂直向下的气泡能辐射效率随着供气压力的增加而增大；③供气压力为15MPa时，气枪震源垂直向下的能量辐射效率为9.4%；④供气压力越大，气枪震源压力波叠加增强的持续距离越远。

The underwater energy radiation characteristics of the airgun seismic source is studied based on the underwater wavelet data collected in the airgun excitation experiments in Binchuan,Yunnan. The empirical formula for calculating the bubble pulsation period and the maximum radius of the underwater airgun seismic source is obtained. The results show that:① The energy radiation efficiency is higher vertically than horizontally. ② The vertical bubble energy radiation efficiency increases with the increase of the gas supply pressure. ③ The vertical energy radiation efficiency of the airgun seismic source is 9.4%when the gas supply pressure is 15MPa. ④ The higher of the gas supply pressure,the farther of the constant distance for the overlay enhanced of the pressure wave of the airgun seismic source.

P315

中国地震局地震科技星火计划项目（XH17031SX）、云南省陈颙院士工作站（2014IC007）共同资助