Abstract
To improve the mitigation of seismic disasters in the Xinjiang region, the peak displacement (Pd) and the period parameter (τc) widely used in magnitude estimation for earthquake early warning systems (EEWSs) were investigated in this study. Based on 331 vertical strong-motion records from 58 earthquakes that occurred in the Xinjiang region between 2007 and 2015, we established and evaluated the magnitude-scaling relationships for the two parameters measured from the first 3 s after the P-wave arrival. The calibrations show that both Pd and τc are correlated with the earthquake magnitude within the magnitude range of the study dataset. The linear slope of the Pd–magnitude relationship in this study is lower than those observed in other regions. The τc parameter shows a consistent increasing trend compared with other studies; however, it yields a large uncertainty in the magnitude estimates using a single station. The reliability of the established relationships is evaluated with two earthquakes from the same region, and the results show that a robust magnitude estimate can be obtained when the closest three seismological stations are used. Our study offers insight into the feasibility of an EEWS in the Xinjiang region.
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All data generated or analyzed during this study are available in the Supplementary Information files.
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Acknowledgments
Data for this study were provided by China Strong Motion Network Centre at the Institute of Engineering Mechanics, China Earthquake Administration. The general drawing tool (Generic Mapping Tools) was used in this paper. We thank Dalia Lahav-Jones for editing the English text of a draft of this manuscript.
Funding
This work was supported by the National Key Research and Development Program of China (2018YFC1504003) and the Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (2016A03).
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Highlights
• The early portion of the P-wave amplitude is a robust parameter for estimating earthquake magnitude.
• Large scatter in the τc parameter indicates that the magnitude estimated from multiple stations is more reliable than that from one station.
• The proposed magnitude relationships can be used as a basis for establishing an earthquake early warning system in Xinjiang, China.
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Wang, Y., Li, S. & Song, J. Magnitude-scaling relationships based on initial P-wave information in the Xinjiang region, China. J Seismol 25, 697–710 (2021). https://doi.org/10.1007/s10950-020-09981-w
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DOI: https://doi.org/10.1007/s10950-020-09981-w