光纤旋转地震仪的主、被动源观测实验与应用

doi:10.11720/wtyht.2024.0142

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Abstract

In the past two decades, high-sensitivity ring laser gyroscopes have demonstrated the potential of rotational observation data in global seismology. Commercial fiber-optic three-component rotational seismometers have heralded a new development phase of rotational seismography. Field experiments for high-sensitivity portable fiber-optic rotational seismometers in China remain in the initial stage, whereas their relevant data analysis results have been obtained internationally. This study elucidated the co-located observation experiments on six components (6C, including three components of translational motions and three components of rotational motions) of an active source and a natural earthquake, involving experimental schemes, implementation steps, and subsequent data analysis. Moreover, this study revealed the primary factors influencing the experiment results by comparatively analyzing the similarities and differences of experiments. Fiber-optic rotational and conventional seismometers need to be fixed on the same rigid panel to ensure the consistency of received signals. Besides, proper ground coupling and burial processing contribute to high-quality experimental data. The experimental results indicate that water bodies will affect surface wave manifestation and P-wave clarity. These findings, enriching the practical experience in seismic rotational observation experiments, serve as a reference for the design of subsequent rotational observation experiments, thereby assisting in completing the experiments and obtaining higher-quality data. In terms of data application, this study optimized and substantiated the feasibility of the preprocessing scheme, with the backazimuth calculation accuracy improved by 58.8° and 50° at the two active-source measuring points, and by 24.1° and 29.4° at the two passive-source measuring points. The application of six-component seismic data from a single seismic station suggests that additional observation of rotational components can acquire more seismic wavefield information, thus the observation of rotational components can be employed to enhance the utilization of China's massive seismic observation data. Overall, fiber-optic rotational seismometers broaden the boundary of seismic monitoring technology, boost seismology research, and create new possibilities for future earthquake research.

Key words： fiber-optic rotational seismometer methane-based active source experiment seismological observation backazimuth calculation

Received: 01 April 2024 Published: 08 January 2025

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	Yu-Jia CAO
	Yan-Jun CHEN
	Zheng-Bin LI
	Yun-Tian TENG
	Ding-Fan ZHANG

Cite this article:

Yu-Jia CAO,Yan-Jun CHEN,Zheng-Bin LI, et al. Active/passive source-based observation experiments and applications of fiber-optic rotational seismometers[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1486-1497.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0142 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1486

22]; c—coordinate system and nomenclature for rotational components
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Schematic diagram of the laster gyroscope
a—ring laser gyroscope G-ring; b—Sagnac effect^[22]; c—coordinate system and nomenclature for rotational components

指标名称	性能数值
灵敏度/(rad·s^-1/ $H z$ )	2×10^-8
频段/Hz	0.01~125
采样率/Hz	250~400
最大角速率/(rad·s^-1)	5
动态范围/dB	160
工作温度/℃	-40~70
尺寸/(mm×mm×mm)	200×200×200
质量/kg	4

The DP-Rots-3C performance parameters

The internal architecture of the portable three-component rotational seismometer DP-Rots-3C

Self-noise power spectra of the three components of the DP-Rots-3C

Setup for the single station six-component(a) and site map of the methane source S25 and receivers P1, P2(b)

Setup for the single station six-component

The epicenter and the receiver points DCZ and HST of the Xingtai M_L3.7 earthquake

The waveforms of methane source receiver points P1(a) and P2(b)

The amplitude spectrum of methane source receiver points P1(a) and P2(b)

Waveforms of the DCZ(a) and HST(b) seismic stations for the Xingtai M_L3.7 earthquake

The amplitude spectrum of the Xingtai M_L3.7 earthquake receivers DCZ(a) and HST(b)

Time-frequency analysis of the Xingtai M_L3.7 earthquake receivers DCZ(a) and HST(b)

The Rotation database preprocessing parameters^[26]

The spectral diagram of the three components RUD, ANS, and AEW, involved in the calculation of the azimuth angle for methane sources
(the numbers on the curve representing the frequency corresponding to the peak of the spectrum)

The backazimuth results of the methane source of the receiver point P1

The backazimuth results of the methane source of the receiver point P2

The backazimuth results of the Xingtai M_L3.7 earthquak

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