Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake. Koketsu, K.; Hikima, K.; Miyazaki, S.; and Ide, S. Earth Planets Space, 56(3):329--334, 2004.
abstract   bibtex   
The strong motion and geodetic data were individually inverted for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter 25 km deep and a fault plane above the subducting Pacific stab. Both the results show a simple slip distribution with a single major asperity, but the strong motion inversion may include a trade-off between slip location and rupture time and the geodetic inversion does not have sufficient resolution for far slips. We then carred out a joint inversion of the two datasets in order to overcome these weaknesses of the single dataset inversions. The resultant slip distribution still retains the simple pattern and has a seismic moment of 2.2 x 10(21) N(.)m (M-w 8.2). The asperity, with a peak slip of 7.1 m, is located in the center of the fault plane 50 km away from the hypocenter in the down-dip direction. The slip rate functions on subfaults around the hypocenter and asperity indicate that the rupture propagated with a supershear speed on the upper part of the fault plane and slowed down to 100-90percent of the S-wave velocity on the middle and lower parts. These simple slip patterns and near-supershear rupture may imply the maturity of the Hokkaido subduction zone around the source region.
@article{koketsu2004,
	Abstract = {The strong motion and geodetic data were individually
inverted for the source
process of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter
25 km deep and a fault plane
above the subducting Pacific stab. Both the results show a simple slip
distribution with a single
major asperity, but the strong motion inversion may include a trade-off
between slip location and
rupture time and the geodetic inversion does not have sufficient
resolution for far slips. We then
carred out a joint inversion of the two datasets in order to overcome
these weaknesses of the single
dataset inversions. The resultant slip distribution still retains the
simple pattern and has a
seismic moment of 2.2 x 10(21) N(.)m (M-w 8.2). The asperity, with a
peak slip of 7.1 m, is located
in the center of the fault plane 50 km away from the hypocenter in the
down-dip direction. The slip
rate functions on subfaults around the hypocenter and asperity indicate
that the rupture propagated
with a supershear speed on the upper part of the fault plane and slowed
down to 100-90percent of the
S-wave velocity on the middle and lower parts. These simple slip
patterns and near-supershear
rupture may imply the maturity of the Hokkaido subduction zone around
the source region.},
	Author = {Koketsu, K. and Hikima, K. and Miyazaki, S. and Ide, S.},
	Date-Modified = {2010-07-12 15:13:04 -0700},
	Issue = {3},
	Journal = {Earth Planets Space},
	Number = {3},
	Pages = {329--334},
	Title = {Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake},
	Volume = {56},
	Year = {2004},
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