Real-time Imaging of Earthquake Rupture Process: Offline Tests for the 2011 Mw9.0 Tohoku Earthquake

Wednesday, 17 December 2014
Yong Zhang1,2, Rongjiang Wang2, Jochen Zschau2, Yun-Tai Chen1,3, Stefano Parolai2 and Torsten Dahm2, (1)Peking University, Beijing, China, (2)Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany, (3)China Earthquake Administration, Beijing, China
Lack of the knowledge on rupture process in earthquake early warning (EEW) caused serious underestimations on tsunami disaster of the 2011 Tohoku earthquake. Based on the newly developed iterative deconvolution and stacking (IDS) method for automatic source imaging, we demonstrate an offline test for real-time analysis on the rupture process of the 2011 Tohoku earthquake by using the high-rate GPS measurements. It is shown that, we had been theoretically able to image the complex ongoing rupture process, even with some instabilities of fault slips which depend on the detected moment growth rate (see image uploaded). We also investigate the influences of station density and maximum epicentral distance of the network on real-time source imaging. It is found that, for the case of the 2011 Tohoku earthquake, station spacing within 100 km do not significantly disturb the real-time imaging; and small maximum epicentral distances make real-time estimated magnitudes converge earlier.