Finite element modeling of deformations of the lithosphere at an arc-arc junction: The Hokkaido corner, Japan.

Hashimoto, Manabu

doi:10.4294/jpe1952.32.373

Cited by 25 publications

(12 citation statements)

References 44 publications

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“…The finite element method is a very powerful tool for calculation of deformation and/or stresses in heterogeneous materials, and has been successfully applied in various fields of science. The method has also been frequently used in the solid earth science, for example, to calculate the stresses and/or deformation in plate-subduction and/or plate-collision zones (e.g., Sato et al, 1981Sato et al, , 1996Sato, 1988Sato, , 1989Hashimoto, 1984Hashimoto, , 1985Hashimoto, 1989a, 1989b Miyashita, 1997; Suito and Hirahara, 1999;Hyodo and Hirahara, 2004). In this study, we have used a parallelized finite element code GeoFEM developed at the Research Organization for Information Science and Technology (RIST) (e.g., Iizuka et al, 2002).…”

Section: Models and Methods Of Calculationmentioning

confidence: 99%

Effect of elastic inhomogeneity on the surface displacements in the northeastern Japan: Based on three-dimensional numerical modeling

et al. 2007

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In geodetic inversions such as estimation of coseismic slip and/or afterslip distribution on faults, the displacements on the surface calculated under an assumption of homogeneous elastic half space have been mostly used as the Green's functions (GF's). However, this seems not adequate for better estimations of such slip distribution, because the subsurface structures are more or less inhomogeneous, especially those in and around Japan where the structure must be much complicated. In this study, to examine how much the inhomogeneous subsurface structure affects on the surface displacements, we conduct some 3-D finite element calculations with a grid for the region of 1400 km (EW) × 1200 km (NS) × 200 km (depth) including the Tohoku and Hokkaido, northeastern Japan. Assuming homogeneous and inhomogeneous elastic models with various values for the Young's modulus and Poisson's ratio, we calculated the surface displacements due to a dip-slip type dislocation of 1 m on many cell-like subfaults assumed on the interface between the Pacific and land side plates. Comparing the results, we find a large discrepancy in the surface displacements between the homogeneous and inhomogeneous elastic models and less dependency of the surface displacements on the Poisson's ratio. The discrepancy is found to be more than 20% and can be as large as ∼40% in some cases. Such a large discrepancy indicates that the surface displacements calculated for inhomogeneous elastic medium with realistic subsurface structure, unlike as in usual cases, should be used as the GF's for better geodetic inversions.

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Section: Models and Methods Of Calculationmentioning

confidence: 99%

Effect of elastic inhomogeneity on the surface displacements in the northeastern Japan: Based on three-dimensional numerical modeling

et al. 2007

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“…Occurrence of such a dome shaped Pacific slab beneath the Hokkaido has been reported by many previous authors (e.g. Kanamori, 1971, Hashimoto, 1984, Moriya, 1986. This phenomenon will lock the segment of the interplate boundary above the collision zone hosting the asperity for the accumulation of tectonic stress as a site of nucleation of large subduction earthquake in future.…”

Section: Locking Of Fault Segmentmentioning

confidence: 88%

Spatio-temporal Changes in Stress Field and Occurrence of the 2003 Tokachi Oki Earthquake in Hokkaido, Northern Japan

Tanioka¹,

Ghimire²

2011

New Frontiers in Tectonic Research - General Problems, Sedimentary Basins and Island Arcs

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“…The composite focal mechanism solutions for small earthquakes occurring in the vicinity of the Hidaka belt revealed the same trend (Suzuki et al, 1983a). Several researchers attempted to explain this anomaly as being the effect of change in the strike of the plate margin at the Hokkaido corner (Shimazaki et al, 1978;Kato et al, 1980;Minamino and Fujii, 1981;Hashimoto, 1984). However, it has become evident that these models were too simplistic to explain the stress anomaly in terms of the geometry of the plate boundary.…”

Section: Introductionmentioning

confidence: 97%

Stress due to the interseismic back slip and its relation with the focal mechanisms of earthquakes occurring in the Kuril and northeastern Japan arcs

2008

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Assuming a uniform and inhomogeneous distribution of back slip, based on a realistic configuration of the plate boundary that was newly determined from the distribution of earthquakes, we have investigated if the stress due to the interseismic back slip can explain the focal mechanisms of earthquakes occurring in the Kuril and northeastern Japan arcs. The inhomogeneous back-slip model was taken from the distribution of slip deficit estimated from GPS data collected in recent years. We examined the change in the Coulomb Failure Function (ΔCFF) for several target faults to evaluate the fitness of the models to the observed focal mechanisms. The results of ΔCFF are clearly different in the two back-slip models near the down-dip end of the locked zone. Despite this difference, the models can generally explain the earthquake focal mechanisms in the overriding plate as well as those on the megathrust plate boundary. However, they cannot explain the focal mechanisms of intermediate-depth earthquakes in the double-planed deep seismic zone. Neither can they fully explain the focal mechanisms with the pressure axis parallel to the trench that are observed at the junction of the Kuril and northeastern Japan arcs. Other tectonic processes, such as the transcurrent movement of the forearc sliver along the Kuril arc, may be involved in producing the stress anomaly.

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Finite element modeling of deformations of the lithosphere at an arc-arc junction: The Hokkaido corner, Japan.

Cited by 25 publications

References 44 publications

Effect of elastic inhomogeneity on the surface displacements in the northeastern Japan: Based on three-dimensional numerical modeling

Effect of elastic inhomogeneity on the surface displacements in the northeastern Japan: Based on three-dimensional numerical modeling

Spatio-temporal Changes in Stress Field and Occurrence of the 2003 Tokachi Oki Earthquake in Hokkaido, Northern Japan

Stress due to the interseismic back slip and its relation with the focal mechanisms of earthquakes occurring in the Kuril and northeastern Japan arcs

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