supported by the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB18000000);the National Natural Science Foundation of China(Grant No.41125015)。
Quantifying the density contrasts of the Earth’s inner core boundary(ICB)is crucial to understand core-mantle coupling and the generation of the geodynamo.The PKiKP/PcP amplitude ratio is commonly used to obtain the ...
supported by National Science Foundation of China(41774056);the US Nationa Science Foundation(EAR 1620595)
Approaching the distance of 180°, seismic focusing greatly amplifies the normally weak PKIIKP phase(underside reflection from the inner core boundary). Anomalously strong amplitudes of the PKIIKP phase reported previ...
supported by the National Natural Science Foundation of China(Nos.41204044,40674027);the Fund of Chinese Academy of Sciences(No.KZCX2-EW-121)
Shear velocity and density contrast across the inner core boundary are essential for stud- ying deep earth dynamics, geodynamo and geomagnetic evolution. In previous studies, amplitude ratio of PKiKP/PcP at short dist...
supported by the National Natural Science Foundation of China (Grant No.40574024);the Basic R&D Fund of Institute of Earthquake Prediction,China Earthquake Administration (Grant No.2009A19)
Clear PKIKP precursors were observed from the Lanzhou CTBTO seismic array.We measured their incident angles,arriving azimuths and differential travel times with respect to the PKIKP arrivals using array analysis techn...