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Comparative Study on Magnitude Estimation Based on Early Warning Parameters:Taking the M_j7.4 Earthquake off Fukushima, Japan as an Example

ZHANG Xin-yi;ZHAO Qing-xu;WANG Yan-wei;Guilin University of Technology;  
An empirical formula between early warning parameters and magnitude was established by using the currently mature method of magnitude estimation of early warning parameters and a large number of strong earthquake records of the bedrock observation site downhole in Kiban-Kyoshin network(KiK-net), Japan database. And the empirical formula was used to conduct a study of the M_j7.4 earthquake off Fukushima, Japan, on March 16, 2022, and to comparatively analyze the magnitude estimation effects of different early warning parameters. The results showed that the time-frequency parameter S_(dτ) gave a magnitude estimation result close to the final actual magnitude 2 s after triggering of the first station. 7 s after the trigger of the first station, the magnitude estimation of S_(dτ) was closer to the final actual magnitude. The comparative study of the magnitude early warning parameters for the earthquake showed that the parameters based on the frequency domain and the time domain could effectively improve the accuracy and timeliness of the magnitude estimation.
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