柴海山, 陈克杰, 魏国光, 方荣新, 邹蓉, 祝会忠. 北斗三号与超高频GNSS同震形变监测:以2021年青海玛多Mw 7.4地震为例[J]. 武汉大学学报 ( 信息科学版), 2022, 47(6): 946-954. DOI: 10.13203/j.whugis20220140
引用本文: 柴海山, 陈克杰, 魏国光, 方荣新, 邹蓉, 祝会忠. 北斗三号与超高频GNSS同震形变监测:以2021年青海玛多Mw 7.4地震为例[J]. 武汉大学学报 ( 信息科学版), 2022, 47(6): 946-954. DOI: 10.13203/j.whugis20220140
CHAI Haishan, CHEN Kejie, WEI Guoguang, FANG Rongxin, ZOU Rong, ZHU Huizhong. Coseismic Deformation Monitoring Using BDS-3 and Ultra-High Rate GNSS: A Case Study of the 2021 Maduo Mw 7.4 Earthquake[J]. Geomatics and Information Science of Wuhan University, 2022, 47(6): 946-954. DOI: 10.13203/j.whugis20220140
Citation: CHAI Haishan, CHEN Kejie, WEI Guoguang, FANG Rongxin, ZOU Rong, ZHU Huizhong. Coseismic Deformation Monitoring Using BDS-3 and Ultra-High Rate GNSS: A Case Study of the 2021 Maduo Mw 7.4 Earthquake[J]. Geomatics and Information Science of Wuhan University, 2022, 47(6): 946-954. DOI: 10.13203/j.whugis20220140

北斗三号与超高频GNSS同震形变监测:以2021年青海玛多Mw 7.4地震为例

Coseismic Deformation Monitoring Using BDS-3 and Ultra-High Rate GNSS: A Case Study of the 2021 Maduo Mw 7.4 Earthquake

  • 摘要: 随着北斗三号完成全球组网以及硬件技术发展,地壳形变监测网络的全球导航卫星系统(global navigation satellite system, GNSS)接收机正朝着多系统、超高频(≥50 Hz)更新升级。基于陆态网络和中国青海省连续运行参考站的GNSS观测数据,获取2021年青海玛多Mw 7.4地震的同震位移波,并进行了震前精度统计和功率谱密度分析。结果表明,北斗三号在本次地震中的位移拾取精度比全球定位系统(global positioning system,GPS)更优;采样率提高到50 Hz对削弱位移时间序列混叠效应作用不显著,在10 Hz左右达到饱和;对50 Hz同震位移波差分获取到的速度和加速度序列噪声较大,难以利用。综合应用场景和成本考虑,GNSS地震监测的采样率最高设置在5~10 Hz即可。

     

    Abstract:
      Objectives  With the completion of BeiDou-3 navigation satellite system (BDS-3) and the development of hardware technology, global navigation satellite system (GNSS) receivers in crustal deformation monitoring network are upgraded towards multi-system and ultra-high rate (≥50 Hz). We aim to study the contribution of BDS-3 and multi-GNSS to coseismic deformation collection and the potential of ultra-high rate GNSS to attenuate the aliasing effect and obtain velocity and acceleration series by using difference methods.
      Methods  Based on GNSS observation data from the crustal movement observation network of China and continuously operating reference stations in Qinghai Province, we study the 2021 Maduo Mw 7.4 earthquake and obtain coseismic deformation at the nearby stations through kinematic precise point positioning (PPP). Time series before the earthquake are analyzed by time-domain and frequency-domain, namely standard deviation and power spectrum density (PSD).
      Results  The results show that the accuracy of BDS-3 is about 5 mm horizontally and 18 mm vertically. The accuracy of the multi-GNSS, including GPS, GLONASS, Galileo, BDS-2 and BDS-3, can reach 4 mm horizontally and 12 mm vertically. The results of PSD show that multi-GNSS can contribute to attenuate noise at most frequency and BDS have the lowest noise among all the four systems. Velocity series perform the best at a range of 5—10 Hz, while no acceleration is available at any rate.
      Conclusions  The accuracy of displacement obtained by BDS including BDS-3 is better than that of GPS in this earthquake. The observation of 50 Hz cannot significantly weaken the aliasing effect which reaches saturation at about 10 Hz. The ultra-high rate velocity and acceleration series obtained by difference method are too noisy for usage. The maximum sampling rate of GNSS seismic monitoring can be set at 5—10 Hz which represents a good trade-off between effect and cost.

     

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