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Evaluating a Kinematic Method for Generating Broadband Ground Motions for Great Subduction Zone Earthquakes: Application to the 2003 Mw 8.3 Tokachi‐Oki Earthquake

Abstract We compare broadband synthetic seismograms with recordings of the 2003 M w  8.3 Tokachi‐Oki earthquake to evaluate a compound rupture model, in which slip on the fault consists of multiple high‐stress‐drop asperities superimposed on a background slip distribution with longer rise times. Low‐frequency synthetics ( 1  Hz) stochastic synthetics using a matched filter at 1 Hz. We show that this compound rupture model and overall approach accurately reproduces waveform envelopes and observed response spectral accelerations (SAs) from the Tokachi‐Oki event. We find that sufficiently short subfault rise times (i.e., Electronic Supplement: Additional waveforms and subevent slip distributions.