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核幔界面衍射波P_diff震相最大记录震中距探讨

A discussion on the largest recorded epicentral distance for seismic phase P_diff diffracted on core-mantle boundary

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【Author】 Qin Manzhong;Li Shuncheng;Liu Xuzhou;Zhang Shuzhen;Zhang Yuansheng;Lanzhou Institute of Seismology,China Earthquake Administration;Lanzhou Base of Institute of Earthquake Science,China Earthquake Administration;State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration;

【机构】中国地震局兰州地震研究所；中国地震局地震预测研究所兰州科技创新基地；中国地震局地质研究所地震动力学国家重点实验室；

【摘要】智利MS8.8特大地震在甘肃数字测震台网记录的最大震中距达179.7°,通过读取该地震初至震相的观测走时,计算该震相的平均观测慢度为4.104s/°,与Pdiff震相的理论慢度4.439s/°基本一致.研究结果表明:由于甘肃数字测震台网和甘东南野外观测流动台阵独特的地理位置,记录到了至今全球最大震中距(179.7°)的核幔界面衍射波Pdiff震相;Pdiff震相起始观测走时明显滞后于IASP91理论走时;核幔界面复杂的形态对不同方位传播的Pdiff震相观测走时产生了一定的影响.更多还原

【Abstract】 The largest epicentral distance of Chile MS8.8 earthquake reaches179.7°recorded by Gansu Digital Seismic Network.Through artificially reading observational first-arrival travel time of the Chile earthquake,we calculated the average observational slowness of the first arrival phase is 4.104s/°,which is basically consistent with theoretical slowness(4.439s/°)of Pdiff.The results show that the Pdiffcan recorded at the epicentral distance 179.7°due to particular location of Gansu Digital Seismic Network and southeastern Gansu temporary observation array;the origin observed travel time lags behind the IASP91 theoretical travel time obviously;and Pdifftravel times observed from different directions are affected by complex morphology of the core-mantle boundary.更多还原