A discussion on the largest recorded epicentral distance for seismic phase Pdiff diffracted on core-mantle boundary
Qin Manzhong
Li Shuncheng
Liu Xuzhou
Zhang Shuzhen
Zhang Yuansheng
Abstract：The largest epicentral distance of Chile MS 8.8 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 Pdif .The results show that the Pdif can recorded at the epicentral distance 179.7°due to particu-lar location of Gansu Digital Seismic Network and southeastern Gansu tempora-ry observation array;the origin observed travel time lags behind the IASP91 theoretical travel time obviously;and Pdif travel times observed from different directions are affected by complex morphology of the core-mantle boundary.
Keywords：seismic phase Pdifslownessobservational travel timeChileGan-su Digital Seismic Networksoutheastern Gansu temporary observation array
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 249-256 )