Fig. 1.
From: A dynamic model of the frequency-dependent rupture process of the 2011 Tohoku-Oki earthquake
Shallow secondary features of the Tohoku-Oki earthquake identified in MUSIC back-projection from (a) USArray and (b) European array. The thick black line, double line curve, and the black line east of the epicenter (red star) are the Japanese coastline, the trench and our conventional boundary between “deep” and “shallow” sources, respectively. The deep high-frequency radiators (diamonds) and shallow local maxima (circles) are also shown. The color indicates the rupture time. The size of the circles denotes the ratio between the amplitude of the shallow MUSIC pseudo-spectrum peak and that of the contemporaneous global maximum. (c) The ratio between shallow and deep simultaneous MUSIC pseudo-spectrum maxima for the European array (red) and USArray (blue). The dashed lines indicate the largest ratio for each array. (d) Shallow/deep MUSIC pseudo-spectrum ratio as a function of the shallow/deep source amplitude ratio. (Color figure is in online version.)