Investigation of High-Frequency Noise for Superconducting Gravimeters of China Using Normal Modes of Lushan Earthquake

JIANG Ying; HU Xiaogang

doi:10.13203/j.whugis20140857

Volume 42 Issue 5

May 2017

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Geomatics and Information Science of Wuhan University > 2017 > 42(5): 583-588. > DOI: 10.13203/j.whugis20140857

JIANG Ying, HU Xiaogang. Investigation of High-Frequency Noise for Superconducting Gravimeters of China Using Normal Modes of Lushan Earthquake[J]. Geomatics and Information Science of Wuhan University, 2017, 42(5): 583-588. DOI: 10.13203/j.whugis20140857

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Investigation of High-Frequency Noise for Superconducting Gravimeters of China Using Normal Modes of Lushan Earthquake

JIANG Ying^{1, 2,},
HU Xiaogang^2, ,

1.
Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
2.
State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China

Funds:

The National Natural Science Foundation of China Nos. 41174022

The National Natural Science Foundation of China 41021003

The National Natural Science Foundation of China 41404064

the Open Research Fund Program of State Key Laboratory of Geodesy and Earth's Dynamics No. SKLGED2015-1-2-EZ

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Author Bio:
JIANG Ying, PhD, specializes in Earth's free oscillations, gravity data analysis and its application. E-mail: jiangyingchen@126.com
Corresponding author:
HU Xiaogang, PhD, research fellow. E-mail:hxg432@whigg.ac.cn
Received Date: March 22, 2016
Published Date: May 04, 2017

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Abstract

Abstract

Given the very low instrumental noise at frequencies below 1 mHz, the superconducting Gravimeter (SG) is a highly sensitive and stable gravimeter for observations of the Earth's tides. As a new generation of SGs is widely used in observations and research on changes of gravity caused by activity in the interior Earth in recent years, the noise level of SGs at high frequency recording band is receiving more and more attention. Weak signals from the free oscillations of the Earth can help us directly investigate the capability of SGs to contribute to geodynamics research. The Lushan Mw6.6 earthquake, on 20 April 2013 in Sichuan, China, generated weak spheroidal modes in 2~8 mHz. We investigated the normal modes recorded by 5 SGs of mainland China, and computed the synthetic normal modes according to the theory of double couple centroid moment tensor based the spherical, non-rotating, elastic and isotropic (SNREI) Earth model. The results show that at the 2~5 mHz frequency band, the SG057 at the Lhasa station, the SG053 and the portable SG (iGrav) at the Wuhan station had a low noise level; the SG65 at Wuhan station and SG66 at Lijiang station had a high noise level. The test method and results can provide the reference when studying the high-frequency noise level of a gravimeter for clearing the application range.
- superconducting gravimeter,
- noise level,
- Earth's free oscillations,
- Lushan Earthquake

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Investigation of High-Frequency Noise for Superconducting Gravimeters of China Using Normal Modes of Lushan Earthquake

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