The upper boundary of the Philippine sea plate beneath the western Kanto region estimated from S-P-converted wave

Iidaka, Takashi; Mizoue, Megumi; Nakamura, Isao; Tsukuda, Tameshige; Sakai, Kimitoshi; Kobayasi, M.; Haneda, Toshio; Hashimoto, Shinichi

doi:10.1016/0040-1951(90)90297-l

Cited by 26 publications

(18 citation statements)

References 6 publications

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“…In the southernmost profile (Figure 10d), earthquakes associated with the Philippine Sea slab become shallower toward the neck of the Izu Peninsula, and the inferred upper interface of the Philippine Sea slab is located immediately above the slab seismicity, suggesting the validity of the configuration of the Philippine Sea slab proposed in this study. Iidaka et al [1990] deduced the subduction of the Philippine Sea slab down to a depth of 20 km in this region, which supports the shallow subduction of the Philippine Sea slab at the neck of the Izu Peninsula.…”

Section: Discussionsupporting

confidence: 63%

“… Iidaka et al [1990] found a clear X phase between P and S phases on seismograms from an earthquake in the Kanto‐Chubu region and interpreted the X phase as the S ‐to‐ P converted wave at the upper boundary of the subducting Philippine Sea plate. They deduced the subduction of the Philippine Sea slab down to a depth of 20 km even north of the Izu Peninsula.…”

Section: Discussionmentioning

confidence: 99%

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Subduction of the Philippine Sea plate beneath southwestern Japan: Slab geometry and its relationship to arc magmatism

2007

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We carry out high‐resolution three‐dimensional seismic tomography of the crust and upper mantle beneath southwestern (SW) Japan using arrival‐time data obtained from the nationwide seismograph network. The tomographic images provide new insights into the configuration of the Philippine Sea slab and arc magmatism. The results confirm the existence of an aseismic portion of the Philippine Sea slab at greater depths beyond the seismic portion. The Philippine Sea slab is subducting aseismically down to at least a depth of 200 km in Chubu, 60–80 km in Kinki, and 60 km in Chugoku and is subducting seismically to depths of 150–200 km in Kyushu. In the Chubu district, it is subducting seismically at a shallow dip and then bends downward beneath the volcanic area, whereas in the Kinki district, it is subducting subhorizontally as far as the Japan Sea. The differences in the slab geometry between adjacent regions correlate with the differences in volcanic activity, suggesting the importance of the geometry of the Philippine Sea slab on arc magmatism. Our tomographic images further imply subduction of the Philippine Sea slab down to a depth of around 70 km northwest of the Izu Peninsula. The Philippine Sea slab in that region might have split into western and eastern parts separated by a slab tear and collided with the Pacific slab at depths of 150–200 km.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Subduction of the Philippine Sea plate beneath southwestern Japan: Slab geometry and its relationship to arc magmatism

2007

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“…For example, the M CT-waves from the plate boundary are more remarkable in the seismograms of intermediate depth earthquakes than the reflection waves. Many authors have analyzed this phase to detect the plate boundary and to estimate its depth (Okada, 1971;Mitronovas and !sacks, 1971;Snoke et al, 1977;Hasegawa et al, 1978;Nakanishi, 1980;Reyners and Coles, 1982;Honda, 1984;Chiu et al, 1985;Matsuzawa et al, 1986;Iidaka et al, 1989aIidaka et al, ,1989b. They picked up travel times of the MCT-waves trace by trace, supposed a model of a velocity structure, calculated theoretical travel times by a ray-tracing method and obtained residuals.…”

confidence: 99%

Seismic transmission survey: Mapping in two‐layered media

Katsumata

1992

Geophysical Research Letters

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I propose a new concept of a seismic survey which takes advantage of mode‐converted transmission waves. This method furnishes us with valuable information independent of any other survey which have been used to explore the Earth's structure. In the seismic reflection survey, both not mode‐converted and mode‐converted reflection waves are used in order to obtain the section of the reflectivity. In the seismic transmission survey, refraction waves with mode changes from P to SV or from SV to Pin propagating through the interfaces are used in order to obtain the section of the transmissivity. The model consists of only a horizontally layered elastic medium. To correct the normal move‐out of the transmission waves, I apply the method which have been developed to process the mode‐converted reflection waves. The approximation error is estimated by comparing with the exact solution in the case of a horizontally two‐layered medium. Numerical simulations prove that this method is available for the two‐layered medium with the discontinuity which has the inclination of 30 degrees.

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“…The location of the upper boundary of the Pacific slab has also been obtained using P to S converted waves (Iidaka et al, 1989) and using reflected S waves (Obara, 1989) in the northeastern and northern Kanto regions, respectively. The iso-depth lines obtained from ScSp data in this study are consistent with those of Iidaka et al (1989), but inconsistent with those of Obara (1989) which were determined to be about 10 km shallower than those of our study. The obtained dip angle are slightly different from the angle of about 25 degrees obtained from seismicity map (Ishida, 1992).…”

mentioning

confidence: 99%

The Upper Boundary of the Subducting Pacific Plate Estimated from ScSp Waves beneath the Kanto Region, Japan.

Iidaka

Obara

1993

J,Phys,Earth

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The upper boundary of the Philippine sea plate beneath the western Kanto region estimated from S-P-converted wave

Cited by 26 publications

References 6 publications

Subduction of the Philippine Sea plate beneath southwestern Japan: Slab geometry and its relationship to arc magmatism

Subduction of the Philippine Sea plate beneath southwestern Japan: Slab geometry and its relationship to arc magmatism

Seismic transmission survey: Mapping in two‐layered media

The Upper Boundary of the Subducting Pacific Plate Estimated from ScSp Waves beneath the Kanto Region, Japan.

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