Rapid Moment Magnitude Estimation Using Strong Motion Derived Static Displacements

The static surface deformation can be recovered from strong motion records. Compared to satellite-based measurements such as GPS or InSAR, the advantage of strong motion records is that they have the potential to provide real-time coseismic static displacements. The use of these valuable data was optimized for the moment magnitude estimation. A centroid grid search method was introduced to calculate the moment magnitude by using1 model. The method to data sets was applied of the 2011, Mw 9.0 Tohoku earthquake, the 2004, Mw 9.0 Sumatra earthquake, the 2010, Mw 8.8 Maule earthquake, the 2003, Mw 8.3 Tokachi-Oki earthquake, the 2010, Mw 7.8 Mentawai earthquake and the 2007, Mw 7.7 Tocopilla earthquake. The method calculates reasonable moment magnitude using static surface displacement data even only from single station. This method can be done very rapidly within approximately 5 minutes. It provides crucial information e.g. for making tsunami early warning decision.