A Study of Early High-frequency Precursors by Physical Modeling


Early high-frequency precursors, which arrive before the onset of P waves, have been observed at some subducted zones. Seismologists considered this phenomenon to be the result of high-frequency seismic waves propagation in a high-velocity layer (HVL). Although some numerical simulations have been used to explain the existence of early high-frequency precursors, a high frequency 3-D elastic model has not been considered. 

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