Detection of Earth’s Low-Frequency Free Oscillation Excited by the 2011 Tohoku MW 9.0 Earthquake Using Tiltmeter Network in Mainland China
Abstract After the 2011 Tohoku MW 9.0 earthquake, 43 vertical pendulum tiltmeters recorded the Earth’s free oscillation signals that were excited by the great earthquake. We find that the tiltmeters have a special sensitivity to detect low-frequency Earth’s free oscillation (1~5 mHz). Even in very low frequencies (<1.5 mHz), the modes can be identified with high SNR. We select 36 records out of 43 stations in this study. Using signal enhancement methods (product spectrum over 36 records), even the gravest modes are detected. All of the spheroidal oscillation modes (0S3~0S38) and almost all of the toroidal oscillation modes(0T3~0T28) and 21 harmonic modes are observed.
Cite this article:
MENG Fangjie,ZHANG Yan,ZHAO Jiajia. Detection of Earth’s Low-Frequency Free Oscillation Excited by the 2011 Tohoku MW 9.0 Earthquake Using Tiltmeter Network in Mainland China[J]. jgg, 2018, 38(6): 650-654.
MENG Fangjie,ZHANG Yan,ZHAO Jiajia. Detection of Earth’s Low-Frequency Free Oscillation Excited by the 2011 Tohoku MW 9.0 Earthquake Using Tiltmeter Network in Mainland China[J]. jgg, 2018, 38(6): 650-654.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2018/V38/I6/650
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