Abstract：This paper uses data recorded by the BB channel of JCZ-1T ultra broadband seismometer at Korla seismic station. We use power spectral density estimation methods, acquiring the fundamental frequency spherical free oscillation 0S7～0S60 of the Indonesian, sea of Sumatra M7.8 earthquake of March 2, 2016 and the Ecuadorian M7.5 earthquake of April 17, 2016, without any correction pretreatment. We conclude that the measured values coincide with theoretical values. Except some modal, the error ratio is less than 0.1% in the rest, by comparing with PREM theoretical values. The conclusions suggest the significance of further research on the internal structure of earth and focal mechanism.
ZHANG Jiamin,ZHANG Xiaofei. Using Observed Data of BB Channel of the JCZ-1T Seismometer to Detect Earth’s Free Oscillations[J]. jgg, 2017, 37(12): 1297-1301.
