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Transverse component of the synthetic seismograms in front of the rupture for sources with the same rupture velocity, the same seismic moment but different rupture length. The dotted line is travel time curves of S and SS phase generated by TauP Toolkit. The rupture velocity is 0.024 deg/s, and the rupture length is 5 km (light blue), 10 km (red), 30 km (dark blue) and 70 km (black). The yellow line is the synthetic seismogram for point source. The waveforms are normalized according to the maximum amplitude in the point source seismogram with the same epicentral distance. The number on the left is the maximum amplitude in the point source seismogram. Note that we plot the seismograms throughout this paper if not stated otherwise. We can observe from this figure that the synthetic seismograms in front of the rupture for every rupture length are all very similar to those of the point sources

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