Frequency band-dependence of S-wave splitting in China mainland and its implications |
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| Authors: | LIU Kun ZHANG Zhongjie Hu Jiafu TENG Jiwen |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China
2. Department of Earth Science, Yunnan University, Kunming 650091,China |
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| Abstract: | Butterworth band-pass filter has been applied to S-wave data recorded at 8 stations in China mainland, and S-wave splitting
at different frequency bands is analyzed. The results show that the delay time and the fast polarization directions of S-wave
splitting depend upon the frequency bands. There is an absence of S-wave splitting at the station of Urumqi (WMQ) for the
band of 0.1–0.2 Hz. With the frequency band broadening, the delay time of S-wave splitting decreases at the stations of Beijing
(BJI), Enshi (ENH), Kunming (KMI) and Mudanjiang (MDJ); the fast polarization direction changes from westward to eastward
at Enshi (ENH), and from eastward to westward at Hailaer (HIA). The variations of delay time with bands at Lanzhou (LZH) and
Qiongzhong (QIZ) are similar, and there is a coherent trend of fast polarization directions at BJI, KMI and MDJ, respectively.
Initial interpretations to the results of frequency band-dependence of S-wave splitting are also presented. |
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| Keywords: | China mainland station data from natural earthquakes frequency band-dependence of S-wave splitting resolving scale |
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