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Qin Manzhong, Li Shuncheng, Liu Xuyu, Zhang Shuzhen, Zhang Yuansheng. 2015: A discussion on the largest recorded epicentral distance for seismic phase Pdiff diffracted on core-mantle boundary. Acta Seismologica Sinica, 37(2): 249-256. DOI: 10.11939/jass.2015.02.005
Citation: Qin Manzhong, Li Shuncheng, Liu Xuyu, Zhang Shuzhen, Zhang Yuansheng. 2015: A discussion on the largest recorded epicentral distance for seismic phase Pdiff diffracted on core-mantle boundary. Acta Seismologica Sinica, 37(2): 249-256. DOI: 10.11939/jass.2015.02.005
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A discussion on the largest recorded epicentral distance for seismic phase Pdiff diffracted on core-mantle boundary

  • 1.

    Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China

  • 2.

    Lanzhou Base of Institute of Earthquake Science, China Earthquake Administration, Lanzhou 730000, China

  • 3.

    State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China

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  • Received Date: June 16, 2014
  • Revised Date: September 28, 2014
  • Published Date: February 28, 2015
    Graphical Abstract
    • 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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