Estimation of the 2D crustal velocity structure in the Hidaka and Iburi Subprefectures, Hokkaido, Japan
Miyashita, Ismail Husain Fathi & Kaoru . 2009
Applying the iterative shooting/bisection technique
for rapid forward modeling to the seismic explosion
data, we could refine the crustal velocity structure model of
the western part of the Hidaka collision zone, Hokkaido,
Japan. We used only the precise P-wave first arrival data
obtained by the Research Group for Explosion Seismology,
which set up a 113.4-km-long profile in August 2000 along
with 327 observation points and four shot points with TNT
charges from 100 to 300 kg. We could estimate a twodimensional
inhomogeneous crustal velocity structure model
with a velocity decrease in the eastern direction at a depth of
15.7 km, several portions of velocity reversals with depth
and a low velocity anomaly proposed in previous studies.
The root-mean-square of travel-time residuals was improved
from 0.398 s for the previous structure model to 0.176 s for
the present model with a reduction of 55.8%.
Applying the iterative shooting/bisection technique
for rapid forward modeling to the seismic explosion
data, we could refine the crustal velocity structure model of
the western…
We adopted the seismic tomography technique to
refine the three-dimensional velocity structure model of the
western part of Hokkaido, Japan. Using the P-wave first
arrival data…