Abstract
We propose a method that employs the squared displacement integral (ID2) to estimate earthquake magnitudes in real time for use in earthquake early warning (EEW) systems. Moreover, using τ c and P d for comparison, we establish formulas for estimating the moment magnitudes of these three parameters based on the selected aftershocks (4.0 ≤ M s ≤ 6.5) of the 2008 Wenchuan earthquake. In this comparison, the proposed ID2 method displays the highest accuracy. Furthermore, we investigate the applicability of the initial parameters to large earthquakes by estimating the magnitude of the Wenchuan M s 8.0 mainshock using a 3-s time window. Although these three parameters all display problems with saturation, the proposed ID2 parameter is relatively accurate. The evolutionary estimation of ID2 as a function of the time window shows that the estimation equation established with ID2 Ref determined from the first 8-s of P wave data can be directly applicable to predicate the magnitudes of 8.0. Therefore, the proposed ID2 parameter provides a robust estimator of earthquake moment magnitudes and can be used for EEW purposes.
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Acknowledgements
We would like to thank the China Strong Motion Net Centre for the recorded data. This research has been supported by the State Key Program of National Natural Science Foundation of China (Grant Number U1434210) and the National Natural Science Foundation of China (Grant Numbers 51778046 and 51278045). We thank Professor Kojiro Irikura and Professor Masanori Horike for helpful discussions. We would also like to express our gratitude to Editor Dr. Mariano Garcia-Fernandez and anonymous reviewers for many valuable comments.
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Wang, Z., Zhao, B. A new M w estimation parameter for use in earthquake early warning systems. J Seismol 22, 325–335 (2018). https://doi.org/10.1007/s10950-017-9708-7
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DOI: https://doi.org/10.1007/s10950-017-9708-7