A New Magnitude Estimation Method Based on Predominant Period and Peak Amplitude

Abstract eng:
Earthquake Early Warning (EEW) is a useful tool for practical real-time seismic hazard mitigation at present. The critical technology of EEW is determining the size of an earthquake and the predicted ground motion at given site, from the first few seconds of the P waves. Currently, there are two different approaches to the EEW magnitude estimation, predominant period method and amplitude method. However, both methods have some disadvantages, such as significant uncertainty and saturation at great magnitude. To improve the estimation of magnitude, a new united predominant period τc and amplitude Pmax method is developed and the formula is M = a*log Pmax +b*logτc +c*log Δ +d Where a, b, c, and d are constants, Δ is epicentral distance. The magnitude estimation results of the first three second P wave of NSMP strong motion data indicate that, the estimation precision of new method is higher than those of the two methods mentioned above, and the saturation at great magnitude is improved. Meanwhile, for short hypocentral distances, a simplified united predominant period τc and amplitude Pmax method is presented, the formula is M = a*log Pmax +b*logτc +d

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