| 核幔界面衍射波Pdiff震相最大 记录震中距探讨 |
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| 引用本文： | 秦满忠,李顺成,刘旭宙,张淑珍,张元生.核幔界面衍射波Pdiff震相最大 记录震中距探讨[J].地震学报,2015,37(2):249-256. |
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| 作者姓名： | 秦满忠 李顺成 刘旭宙 张淑珍 张元生 |
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| 作者单位： | 1.中国兰州 730000 中国地震局兰州地震研究所 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务专项，国家自然科学基金项目(40874029)共同资助． |
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| 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4.104 s/°， 与Pdiff震相的理论慢度4.439 s/°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.
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| 关 键 词： | Pdiff震相 慢度 观测走时 智利 甘肃数字测震台网 甘东南野外观测流动台阵 |
| 收稿时间： | 2014-06-17 |
A discussion on the largest recorded epicentral distance for seismic phase Pdiff diffracted on core-mantle boundary |
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| Qin Manzhong,Li Shuncheng,Liu Xuzhou,Zhang Shuzhen,Zhang Yuansheng.A discussion on the largest recorded epicentral distance for seismic phase Pdiff diffracted on core-mantle boundary[J].Acta Seismologica Sinica,2015,37(2):249-256. |
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| Authors: | Qin Manzhong Li Shuncheng Liu Xuzhou Zhang Shuzhen Zhang Yuansheng |
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| Affiliation: | 1.Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China2.Lanzhou Base of Institute of Earthquake Science, China Earthquake Administration, Lanzhou 730000, China3.State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | The largest epicentral distance of Chile MS8.8 earthquake reaches 179.7° 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 4.104 s/°， which is basically consistent with theoretical slowness (4.439 s/°) of Pdiff. The results show that the Pdiff can 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 Pdiff travel times observed from different directions are affected by complex morphology of the core-mantle boundary. |
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| Keywords: | seismic phase Pdif slowness observational travel time Chile Gan-su Digital Seismic Network southeastern Gansu temporary observation array |
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