A new M (w) estimation parameter for use in earthquake early warning systems

作者：Wang, Zijun; Zhao, Boming^*

来源：Journal of Seismology, 2018, 22(1): 325-335.

DOI：10.1007/s10950-017-9708-7

• Earthquake early warning
• Moment magnitude estimation
• Large earthquake
• Initial P wave

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 tau (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 ae<currency> M (s) ae<currency> 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 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.

• 出版日期2018-1
• 单位北京交通大学