Precursors to ScS Phases and dipping interface in the upper mantle beneath southwestern Japan

Nakanishi, Ichiro

doi:10.1016/0040-1951(80)90125-0

Cited by 113 publications

(66 citation statements)

References 30 publications

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“…HASEGAWA et al, 1978;NAKANISHI, 1980;NAKANISHI et al, 1981), and in South America (SNOKE et al, 1977 the focal mechanism, particularly in those determined by this study. In this study we adopted the data of P wave first-motion primarily from the ISC Bulletin to determine the focal mechanisms.…”

supporting

confidence: 56%

ScS polarization anisotropy around the Pacific Ocean.

Ando

1984

J,Phys,Earth

109

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supporting

confidence: 56%

ScS polarization anisotropy around the Pacific Ocean.

Ando

1984

J,Phys,Earth

109

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“…la), which is suggested to be started at -15 Ma [Hibbard and Karig, 1990;Seno and Maruyama, 1984]. The seismic slab extends only to depths of-50 km, but seismic studies show that aseismic slab is located under the volcanic front at depths of-100 km [Nakanishi, 1980]. The volcanic front is located along the north coast of this arc, but the magmatic activity is relatively low compared with that in arcs with deep seismic slabs.…”

Section: Introductionmentioning

confidence: 91%

Heat flow in the Southwest Japan Arc and its implication for thermal processes under arcs

Furukawa

Shinjoe

Nishimura

1998

Geophysical Research Letters

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Abstract. We present 35 new heat flow measurements for the Kinki district in the eastern part of the southwest Japan arc. Heat flow distribution in this region shows zonal structure parallel to the trench. In the across-arc heat flow profile there are two high heat flow peaks: one is located at the volcanic front and the other is between the south coast of this arc and the trench. The high heat flow at the volcanic front is probably caused by the induced flow in the mantle wedge. The high heat flow off the south coast is located in the zone where slab depth is 10-20 km, and is immediately to the ocean side of the boundary at which P-wave velocity increases landward in the upper crust. We thus consider the high heat flow is caused by the uplift of accreted materials along the backstop in the accretionary prism, assuming that seismic velocity is an indicator of rigidity of rocks. The upward flow velocity is estimated to be -1 mm/yr using a simple one-dimensional erosion model, which is consistent with that estimated from the present heights of marine terraces.

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“…In this earthquake, however, its focal mechanism differs from both types, so that we cannot suppose its position within the plate from its focal mechanism. The subducting Philippine Sea plate west and east of the Kinki district, or at Shikoku, Chugoku, and Chubu districts, seems to be more gently dipping and shallower as a whole than that in the Kinki district (OKANO et al, 1978;NAKANISHI, 1980;NAKANISHI et al, 1981;AOKI, 1980), so that the parallel extensional stress by the contortion of the plate is expected within it. Therefore, it is likely that the focal mechanism of the earthquake on October 6, 1981 represents such a state of stress.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, we have also made an investigation on reflected waves from the Philippine Sea plate, and located the plate surface beneath the Kii peninsula (HURUKAWA and HIRAHARA, 1980). NAKANISHI (1980) and SHIONO (1982) have suggested a possibility of northward continuation of the Philippine Sea plate beneath the northern Kinki and the Chugoku districts. In this paper, we shall show some considerations on the relation between the uppermost-mantle structure derived from the apparent velocities and the subducting Philippine Sea plate.…”

Section: Introductionmentioning

confidence: 99%

Uppermost-mantle structure in the Kinki district, Japan as revealed by apparent velocities of subcrustal earthquakes in the Kii peninsula.

Hurukawa

1983

J,Phys,Earth

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The uppermost-mantle structure in the Kinki district has been investigated using apparent velocities of subcrustal earthquakes in the Kii peninsula observed at the Tottori and Hokuriku MicroearthquakeObservatories. Apparent velocities determined by the least-squares method increase with depths from 7.55km/sec at 25km to 8.2km/sec at 65km in the Hokuriku network for the epicentral distances of 160-260km.They concentrate on two values, or about 7.8 and 8.0km/sec, in a depth range of 45-60km.Since no reverse profile exists, the uppermost-mantle structure has been constructed assuming a horizontally layered model. Three layers, of which velocities are about 7.6, 7.8, and 8.0km/sec, exist below the Moho. Top depths of them are 40, 50, and 60km, respectively. On the other hand, we have applied the same method to the data in the Tottori network for the epicentral distances of 130-200km. The Pn velocity has been determined as 7.6km/sec when the Moho is 32km in depth, and an about 8.0km/sec layer lies at a depth of about 60km. Therefore, the layer of about 8.0km/sec exists generally at a depth of about 60km in the Kinki district. We cannot tell, however, whether this layer is an aseismic continuation of the Philippine Sea plate or not.

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Precursors to ScS Phases and dipping interface in the upper mantle beneath southwestern Japan

Cited by 113 publications

References 30 publications

ScS polarization anisotropy around the Pacific Ocean.

ScS polarization anisotropy around the Pacific Ocean.

Heat flow in the Southwest Japan Arc and its implication for thermal processes under arcs

Uppermost-mantle structure in the Kinki district, Japan as revealed by apparent velocities of subcrustal earthquakes in the Kii peninsula.

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