[SSS15-P15] The dependence of the initial part of the peak displacement amplitude of P-wave on magnitude
The purpose of this study is to examine the method of Colombelli et al. (2014) to other events and to check whether the results consistent with them of Colombelli et al. (2014) or not. In this study, new earthquakes, which have not been analyzed by Colombelli et al. (2014), were analyzed and the scaling between T1, T2, B1 and PL and magnitude was found as same as the results Colombelli et al. (2014) obtained, while a few events were off the trend of T1, T2 and B1 vs. magnitude. There are the following possible causes of estimating T1, T2 and B1 much smaller or larger than these parameters of other earthquakes: the analytical methods, the station characteristics and individual events' characteristics. Examing these matters, we cannot find big problems with analytical methods and stations. Therefore, the cause of estimating T1, T2 and B1 much smaller or larger may be the characteristics of individual events. By the previous researches (Ampuero et al. (2002), Ohnaka and Shen (1999), Ohnaka (2003)), the break down stress drop, the stress drop averaged over the entire fault area and slip-weakening distance can affect the value of T1, T2 and B1. Hence, the characteristics of individual events could make T1, T2 and B1 off the trend (large break down stress drop and/or small slip-weakening distance make T1 small and B1 large).