Abstract
High-rate precise point positioning with a global positioning system (GPS) is recognized as a powerful tool for large earthquake monitoring. However, its ability to monitor subdaily subtle deformation is still limited by unmodeled errors, which primarily contain the common-mode error (CME) and multipath. In this study, a combination of modified principal component analysis and the sidereal filtering method is employed to separate and extract the CME and multipath from high-rate GPS displacements. The effectiveness of the proposed method is validated by processing 1 Hz GPS data at 131 static stations over 30 days, during which the 4 and 6 July 2019 Ridgecrest earthquakes occurred. The results show no obvious early afterslip within the first 5 h following the 6 July Mw 7.1 earthquake. The CME mainly consists of the first principal component and can be attributed to satellite orbit and clock errors. The proportion of the CME is higher than that of the multipath in the high-rate displacements, namely 36.7% versus 14.4%, 23.8% versus 18.1%, and 36.1% versus 12.5% for the east, north, and up components, respectively. By applying this method, the high-rate displacements can achieve precisions of 0.47, 0.50, and 1.60 cm in the three components. The results of the rapid fault-slip inversions indicate that the PPP fixed solution augmented with spatiotemporal filtering can improve fault-slip inversion and moment magnitude estimation and may lead to new findings for geophysics.
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Acknowledgements
Our study is financially supported by the National Key Research and Development Program of China (Grant No. 2019YFC1509201), the National Science Fund for Distinguished Young Scholars (Grant No. 41825009), the Funds for Creative Research Groups of China (Grant No. 41721003), and the National Natural Science Foundation of China (No. 41774034).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by K. Zheng, X. Zhang, J. Sang, Y. Zhao, G. Wen, and F. Guo. The first draft of the manuscript was written by K. Zheng, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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We gratefully thank PBO for offering high-rate GPS data (ftp://data-out.unavco.org/), the GPS Analysis Center Coordinator for providing the postprocessed coseismic displacements (ftp://data-out.unavco.org/pub/products/event/), and the Global Geophysical Fluid Center for providing atmospheric and hydrology loadings (http://loading.u-strasbg.fr/).
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Zheng, K., Zhang, X., Sang, J. et al. Common-mode error and multipath mitigation for subdaily crustal deformation monitoring with high-rate GPS observations. GPS Solut 25, 67 (2021). https://doi.org/10.1007/s10291-021-01095-1
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DOI: https://doi.org/10.1007/s10291-021-01095-1