Rotational motions of the Ms7.0 Jiuzhaigou earthquake with ground tilt data

Zhou, Cong; Zeng, Xiaoyu; Wang, Qingliang; Liu, Wenyi; Wang, Cuizhi

doi:10.1007/s11430-018-9320-3

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…However, traditional seismic measurements only focus on translational components without paying attention to rotational aspects, which thus cannot fully meet the requirements for seismic resistance [ 3 ]. In fact, in recent years, a series of seismic damages caused by rotational vibrations have been recorded [ 4 , 5 , 6 , 7 ]. Due to the lack of effective measurements for angular accelerations, especially for angular accelerometers with low frequencies down to 0.01 Hz, the understanding of rotational components remains limited.…”

Section: Introductionmentioning

confidence: 99%

A MEMS Electrochemical Angular Accelerometer with Silicon-Based Four-Electrode Structure

Zhang,

Liu,

Zhu

et al. 2024

Micromachines

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This paper presents a MEMS electrochemical angular accelerometer with a silicon-based four-electrode structure, which was made of thousands of interconnected microchannels for electrolyte flow, anodes uniformly coated on structure surfaces and cathodes located on the sidewalls of flow holes. From the perspective of device fabrication, in this study, the previously reported multi-piece assembly was simplified into single-piece integrative manufacturing, effectively addressing the problems of complex assembly and manual alignment. From the perspective of the sensitive structure, in this study, the silicon-based four-electrode structure featuring with complete insulation layers between anodes and cathodes can enable fast electrochemical reactions with improved sensitivities. Numerical simulations were conducted to optimize the geometrical parameters of the silicon-based four-electrode structure, where increases in fluid resistance and cathode area were found to expand working bandwidths and improve device sensitivity, respectively. Then, the silicon-based four-electrode structure was fabricated by conventional MEMS processes, mainly composed of wafer-level bonding and wafer-level etching. As to device characterization, the MEMS electrochemical angular accelerometer with the silicon-based four-electrode structure exhibited a maximum sensitivity of 1458 V/(rad/s2) at 0.01 Hz and a minimum noise level of −164 dB at 1 Hz. Compared with previously reported electrochemical angular accelerometers, the angular accelerometer developed in this study offered higher sensitivities and lower noise levels, indicating strong potential for applications in the field of rotational seismology.

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Section: Introductionmentioning

confidence: 99%

A MEMS Electrochemical Angular Accelerometer with Silicon-Based Four-Electrode Structure

Zhang,

Liu,

Zhu

et al. 2024

Micromachines

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Seismic waves of the 10 December 2020 M6.6 Yilan earthquake observed by interferometric fiber-optic gyroscope

Chung

Chang

Hsieh

et al. 2022

Terr Atmos Ocean Sci

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A newly developed cost-effective fiber-optic gyroscope (FOG) and an existing seismometer co-locating at the campus of National Central University (NCU) recorded seismic waves of a M6.6 Yilan earthquake and aftershock events occurring at around 24.74° N 122.03° E (88 km away from NCU) during 10–11 December 2020. Two nearest accessible broadband seismographs located in Hsinchu have also been employed as measurement references for facilitating the analysis of the detected seismic signals. Conventional seismometers usually detect the translational components of the seismic waves, while the FOG observes the rotational component. The recorded FOG data exhibit high-resolution details of the rotational component of shockwaves, which provides additional information of seismic waves. The shock waveforms of the translational and rotational components, analyzed under the conservation of the shock wave energy density received by FOG and seismograph, are found to be significantly correlated. The correlation coefficients of 60-s data are > 0.85 for the main shock and > 0.86 for the aftershock, while those of the 10-s peak periods are as high as 0.9064 and 0.8953, respectively. The highly correlated data imply that the energy registered by the two devices are equivalent. The optical interference-based rotation senor of the cost-effective FOG provides a high sensitivity of better than 3.6 deg/h and an extended dynamic sensing range as high as 55 dB with the fully sensing ability from $$\pm$$ ± 3.6 deg/h to $$\pm$$ ± 720,000 deg/h. The FOG seismometer sheds some light on building an earthquake six-degree-of-freedom observation array to have a bettering on the understanding of the seismicity.

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Study on the strong earthquake failure mechanism of space grid structure considering rotational ground motion

Wang,

Nie,

Bai

et al. 2023

Structures

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Rotational motions of the Ms7.0 Jiuzhaigou earthquake with ground tilt data

Cited by 4 publications

References 22 publications

A MEMS Electrochemical Angular Accelerometer with Silicon-Based Four-Electrode Structure

A MEMS Electrochemical Angular Accelerometer with Silicon-Based Four-Electrode Structure

Seismic waves of the 10 December 2020 M6.6 Yilan earthquake observed by interferometric fiber-optic gyroscope

Study on the strong earthquake failure mechanism of space grid structure considering rotational ground motion

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