Abstract
Large earthquakes have been observed to be caused by the rupture of
several asperities. The rapid determination of source parameters
is hence of great importance for correctly determining shaking intensities
or evaluating the strong motion distribution generated by a large
earthquake. This study shows that we can automatically preprocess
strong-motion data using automatic P- and S-phase pickers, determine
the focal mechanism, and identify the fault plane from two nodal
planes. Areal-time simulation is performed for the 2007 Noto Hanto
earthquake.Using our automatic fault plane identificator, we were
able to identify one of the nodal planes with a strike of 62 deg
and a dip of 70 deg within a 30-s interval from the beginning of
focal mechanism determination to the end of waveform inversion. Results
from automatic inversions showed that the slip was confined to a
shallow portion with a maximum slip of about 3 m. The total seismic
moment released in 10 s was 2.0 x 10^18 N m, which corresponds to
a moment magnitude of 6.8.
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