Determination of the Amurian plate motion

D, Wei; Seno, Tetsuzo

doi:10.1029/gd027p0337

Cited by 131 publications

(85 citation statements)

References 35 publications

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“…A right lateral N-S trending fault system is found in Sakhalin and Hokkaido; the formation of this shear zone is thought to be associated with cessation of earlier subduction and reorganization of convergence in the late Cretaceous or Paleogene [Kimura et al, 1983]. This shear zone is thought to be the plate boundary between the North American plate (or a separate Okhotsk plate) and the proposed Amurian plate to the south [Zonenshain and Savostin, 1981], the existence of which has been further supported by regional tectonics and earthquake slip vectors [Wei and Seno, 1995] and a recent GPS study [Takahashi et al, 1999].…”

Section: Tectonic Settingmentioning

confidence: 99%

Low V_p/V_s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p_MP, s_MP, and s_MS underside reflections from the Moho

Zheng

Lay

2006

J. Geophys. Res.

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[1] Teleseismic ground motion recordings of deep earthquakes often contain clear seismic wave reflections from the free surface above the source (pP, sP, sS), with isolated precursors (p M P, s M P, and s M S) produced by underside reflections from the Moho (the crust-mantle boundary) below the free surface reflection points. The waveforms of the depth phases and their precursors are readily modeled, providing constraints, for steep angles of incidence, on integrated two-way crustal travel times and Moho shear and compressional impedance contrasts above deep earthquake source regions. We model surface reflection waveforms in stacks of three-component, long-period WWSSN and digital broadband seismograms for signals traversing the crust and upper mantle beneath the Sea of Okhotsk, which overlies deep earthquakes in the subducted Kurile slab. The crust beneath most of the Sea of Okhotsk is 19-25 km thick, indicating a submerged continental margin, with minor crustal thinning toward the Kuril back-arc basin, where thin oceanic crust is found. Modeling p M P and s M S phases that sample the same subregion provides tight constraints on the V p /V s ratio in the crust and uppermost mantle (assuming common density structure and consistent crustal thickness for P and S waves); the absolute velocities are not constrained by the data. We find unusually low V p /V s ratios in the range 1.6-1.7 for the uppermost mantle under the Sea of Okhotsk and comparably low average V p /V s ratios for the crust in several regions. The presence of fluids and extensive silica enrichment, possibly involving low-temperature veining, are viable explanations for the anomalous V p /V s ratios; this may represent an important process of continentalization taking place landward from the volcanic arc in subduction zones.Citation: Zheng, Y., and T. Lay (2006), Low V p /V s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p M P, s M P, and s M S underside reflections from the Moho,

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Section: Tectonic Settingmentioning

confidence: 99%

Low V_p/V_s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p_MP, s_MP, and s_MS underside reflections from the Moho

Zheng

Lay

2006

J. Geophys. Res.

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“…Next, the Sheet C is overlaid on the Sheet B, being pierced by the thumbtack at the southern tip of the Japan Trench so that the Japan Trench and the Izu-Ogasawara Trench can move together. Finally, the Sheet C is stuck by a blue pin at northern Sakhalin, because the Euler Pole between NE Japan and stable Eurasian Plate is located near Okha in Sakhalin (Wei and Seno, 1998). The thumbtack moves along the slit as the Philippine Sea Plate rotates, which turns NE Japan clockwise.…”

Section: Improved Modelmentioning

confidence: 99%

The cause of the east–west contraction of Northeast Japan

Takahashi

2017

Bull. Geol. Surv. Japan

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Masaki Takahashi (2017) The cause of the east-west contraction of Northeast Japan. Bull. Geol. Surv. Japan, vol. 68 (4), p. 155-161, 5 figs.Abstract: Northeast (NE) Japan, where the Pacific Plate is subducted to the west, frequently suffers large earthquakes not only along the Japan Trench but also along the Japan Sea side. Those occurred in the former area (subduction-zone earthquake) such as the 2011 off the Pacific coast of Tohoku Earthquake can easily be understood as a releasing process of accumulated stress along the boundary between the subducting Pacific Plate and the overlying plate. On the contrary, those in the latter area (inland earthquake), which occur at relatively shallow depth (<20 km), cannot be explained by such a simple dislocation model. Here I show, the cause of such inland earthquakes can be identified by considering the plate kinematics around the Japanese Islands on the basis of three dimensions, not conventional two dimensions, and the cause of the present E-W contractive tectonics of NE Japan is not the Pacific Plate motion itself but the northwestward-moving Philippine Sea Plate.

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“…Especially in central Japan three arcs (Northeast Japan, Izu-Ogasawara, and southwest Japan arcs) are mutually colliding, where deformed structures and active faults associated with inland crustal earthquakes are concentrated along the fringing zone east and south of Japan Sea. The mobile belt along the Japan margin of Amur Plate runs from Sakhalin -Hokkaido on the Okhotsk plate side, through the volcanic inner zones of the Northeast Japan arc, to the Southwest Japan arc on the Amur plate side [1,2,70,71]. In detail, this belt includes the tectonic zone along eastern margin of Japan Sea, the Noto -San'in tectonic zone, and the Niigata -Kobe tectonic zone.…”

Section: Tectonic Inversion Of Sedimentary Basins and Related Faultsmentioning

confidence: 99%

“…This hypothesis includes an eastward motion of the Amur plate with convergence along the east Japan margin and transpression along the west Japan margin as well as its collision in central Japan [1,2,71].…”

Section: Lateral Variation In Modes Of Active Tectonicsmentioning

confidence: 99%

Tectonic Process of the Sedimentary Basin Formation and Evolution in the Late Cenozoic Arc-Arc Collision Zone, Central Japan

Takeuchi¹

2013

Mechanism of Sedimentary Basin Formation - Multidisciplinary Approach on Active Plate Margins

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Determination of the Amurian plate motion

Cited by 131 publications

References 35 publications

Low V_p/V_s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p_MP, s_MP, and s_MS underside reflections from the Moho

Low V_p/V_s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p_MP, s_MP, and s_MS underside reflections from the Moho

The cause of the east–west contraction of Northeast Japan

Tectonic Process of the Sedimentary Basin Formation and Evolution in the Late Cenozoic Arc-Arc Collision Zone, Central Japan

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Determination of the Amurian plate motion

Cited by 131 publications

References 35 publications

Low Vp/Vs ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic pMP, sMP, and sMS underside reflections from the Moho

Low Vp/Vs ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic pMP, sMP, and sMS underside reflections from the Moho

The cause of the east–west contraction of Northeast Japan

Tectonic Process of the Sedimentary Basin Formation and Evolution in the Late Cenozoic Arc-Arc Collision Zone, Central Japan

Contact Info

Product

Resources

About

Low V_p/V_s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p_MP, s_MP, and s_MS underside reflections from the Moho

Low V_p/V_s ratios in the crust and upper mantle beneath the Sea of Okhotsk inferred from teleseismic p_MP, s_MP, and s_MS underside reflections from the Moho