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Precursor times of abnormal b-values prior to mainshocks

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Abstract

Seismic observations exhibit the presence of abnormal b-values prior to numerous earthquakes. The time interval from the appearance of abnormal b-values to the occurrence of mainshock is called the precursor time. There are two kinds of precursor times in use: the first one denoted by T is the time interval from the moment when the b-value starts to increase from the normal one to the abnormal one to the occurrence time of the forthcoming mainshock, and the second one denoted by T p is the time interval from the moment when the abnormal b-value reaches the peak one to the occurrence time of the forthcoming mainshock. Let T* be the waiting time from the moment when the abnormal b-value returned to the normal one to the occurrence time of the forthcoming mainshock. The precursor time, T (usually in days), has been found to be related to the magnitude, M, of the mainshock expected in a linear form as log(T) = q + rM where q and r are the coefficient and slope, respectively. In this study, the values of T, T p , and T* of 45 earthquakes with 3 ≤ M ≤ 9 occurred in various tectonic regions are compiled from or measured from the temporal variations in b-values given in numerous source materials. The relationships of T and T p , respectively, versus M are inferred from compiled data. The difference between the values of T and T p decreases with increasing M. In addition, the plots of T*/T versus M, T* versus T, and T* versus T-T* will be made and related equations between two quantities will be inferred from given data.

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Acknowledgments

This study was financially supported by Academia Sinica, the Ministry of Science and Technology (Grand No.: MOST 103-2116-M-001-010), and the Central Weather Bureau (Grand Nos.: MOTC-CWB-104-E-07 and MOTC-CWB-105-E-07), ROC.

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Wang, JH., Chen, KC., Leu, PL. et al. Precursor times of abnormal b-values prior to mainshocks. J Seismol 20, 905–919 (2016). https://doi.org/10.1007/s10950-016-9567-7

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