• 责任者：Peng Chaoyong (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Yang Jiansi
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(10)
• 关键词：地震波记录曲线 ; seismograms ; 震级 ; magnitude ; 地震预测 ; earthquake prediction ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.3404-3415
• 图表：9 illus., 3 tables, 33 refs.
• 分类号：0500
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     As one of the effective ways to mitigate earthquake hazards, earthquake early warning （EEW） has been studied by many countries and regions in the world. They have achieved significant mitigation practical effectiveness during operations. We studied the correlation between the final event magnitude and four early-warning parameters obtained from the early portion of P and S phases for the Wenchuan mainshock and its aftershocks. The investigated parameters are the peak displacement （Pa）, the integral of the velocity squared （IV2）, and the predominant and characteristic periods （rp and r0）. The used dataset spans from 12 May 2008 to 4 October 2008 and includes 218 events with magnitude greater than or equal to 4, including the main event （MS. 0）, the largest aftershock of M6.5, and 7 events with magnitude greater than 6. Pd, IV2 and rc are well correlated with the final magnitude and no saturation effect is observed when magnitudes are less than or equal to 6. 5, confirming previous results. However, when estimating the mainshock, these parameters have different degrees of underestimated phenomenon, especially IV2 parameter. In addition , there are slope changes in the Pa and IV2regression curves around M6, and Pa result is quite different from the previous results, rp result shows that this parameter is not suitable for the EEW system in the Wenchuan area.