Detection of Earth’s Free Oscillations Stimulated by the Mw8.3 Okhotsk Sea Earthquake in 2013 Based on Observational Data of Water-Tube Tiltmeters in Shaanxi Province

Abstract:

Using power spectrum density estimation method, analyzed the digital observational data of water-tube tiltmeters of Shaanxi deformation monitoring network in 6 seismic stations as QL, HZ, HY, BJ, XA and NQ, which detected the earth’s free oscillations stimulated by the Mw8.3 Okhotsk Sea Earthquake in May 24th, 2013. The results show that radical shock of spherical oscillation (₀S₀₅~₀S₃₂), harmonic spherical oscillation (₃S₀₁, ₁S₀₄, ₂S₀₄, ₁S₀₆) and toroidal oscillations (₀T₀₅~₀T₀₉) are detected effectively. Comparing the period of the extracted oscillation with that the theoretical oscillation of the Preliminary Reference Earth Model (PREM), finding that they are accordant with each other and the relative error is less than 0.2%. And the result is consistent with the CDSN Urumqi observatory recorded in M8.1 Kunlun Mountains Earthquake in 2001.

• Periodical: Applied Mechanics and Materials (Volumes 568-570)
• Pages: 198-202
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.568-570.198
• Online since: June 2014
• Authors: Xiao Yi Shao, Ying Chang Wang, Xi Chun Xing
• Keywords: Earth’s Free Oscillation, Mw8.3 Okhotsk Sea Earthquake, Power Spectrum Density, Water-Tube Tiltmeter

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