Abstract
Retrieving the coseismic displacement in real time is essential when the high-rate Global Navigation Satellite System (GNSS) is used for the real-time earthquake source description. In 2020, the third generation of the BeiDou Global Navigation Satellite System (BDS-3) initiated a real-time precise point positioning service through the B2b signal (PPP-B2b), which provides a new possibility for real-time earthquake source description. In this study, the performance of the PPP-B2b on the real-time retrieval of coseismic displacement was first validated with GNSS observations collected during the 2021 Mw 7.4 Maduo earthquake. Then, the warning magnitude, focal mechanism and fault slip distribution were inverted with the derived PPP-B2b displacement in a simulated real-time model. Our results indicate that the accuracies of the coseismic displacements in the north, east and up components are 0.8 cm, 0.5 cm, and 1.4 cm for the single GPS PPP-B2b, 0.5 cm, 0.6 cm, and 0.9 cm for the single BDS-3 PPP-B2b and 0.4 cm, 0.3 cm, and 0.4 cm for the combined GPS/BDS-3 PPP-B2b, respectively, when compared with the coseismic displacements of the post-processing precise point positioning (PPP). Moreover, the warning magnitude, focal mechanism and fault slip distribution inverted with the PPP-B2b displacements are all in good agreement with those inverted with the PPP displacements. This study highlights the great possibility of the PPP-B2b to be used for earthquake early warning and rapid emergency responses.
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Data availability
The final precise orbit and clock products from the Wuhan University can be obtained at ftp://igs.gnsswhu.cn/pub/. The GNSS observations from the CMONOC, the CORS and the China Mobile Communications Group Co., Ltd. can be obtained under permission.
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Acknowledgements
This work is co-supported by the Qingdao Natural Science Foundation (23-2-1-70-zyyd-jch), the Shandong Provincial Natural Science Foundation (ZR202211210055), the Fundamental Research Funds for the Central Universities (22CX06034A) and the key project of the National Natural Science Foundation of China (42130101). The authors acknowledge the Crustal Movement Observation Network Of China (CMONOC), the Continuously Operating Reference Stations of Qinghai Province in China (CORS) and the China Mobile Communications Group Co., Ltd. for providing GNSS observations.
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JZ performed the data processing and wrote the manuscript. SF contributed to the experimental design, analysis and proof-read the manuscript. CX provided the advice and guidance for the results analysis. ZL contributed to the GNSS data collection and processing. RF and YL contributed to the recovery of the precise satellite orbit and clock offsets with the PPP-B2b corrections.
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Zang, J., Fan, S., Xu, C. et al. Performance assessment of the BDS-3 PPP-B2b service for real-time earthquake source description: a case study for the 2021 Mw 7.4 Maduo earthquake. GPS Solut 28, 26 (2024). https://doi.org/10.1007/s10291-023-01570-x
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DOI: https://doi.org/10.1007/s10291-023-01570-x