Synthetic sensitivity analysis of high frequency radiation of 2011 Tohoku-Oki (MW 9.0) earthquake

Elsevier BV - 2014
Haoran Meng1, Yongshun John Chen1
1Institute of Theoretical and Applied Geophysics, School of Earth and Space Sciences, Peking University, Beijing, China

Tóm tắt

Frequency-dependent rupture behavior of subduction zone interplate megathrust faults has been observed by back-projection method in different frequency bands (from 0.05 to 5 Hz). It has been suggested that the down-dip region of the Tohoku megathrust radiated strongly at high frequencies (>10 Hz) compared with that of the up-dip region. By assuming the same source time function of each fault patch, we perform a synthetic sensitivity analysis to compare the energy received from the shallower parts (and further way from the receiver sites) with that from the deeper parts (and closer to the receiver sites) of the rupture. Our results indicate that regional on-shore recordings are probably not adequate to constrain the presence of far-off shore high frequency radiations because of the strong attenuation of this region.

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