Mesozoic Arc-Trench Systems in Hokkaido, Japan

Kiminami, Kazuo; Kontani, Yoshihiro

doi:10.1007/978-94-009-7102-8_8

Cited by 28 publications

(24 citation statements)

References 24 publications

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“…1b). The Oshima Belt (OB), which is northern extension of the NE Japan, has been formed by westward subduction and accretion processes at the eastern margin of the Asian Continent (e.g., Kiminami and Kotani 1983;Niida and Kito 1986). The Sorachi-Yezo Belt (SYB) is comprised of a Jurassic ophiolite and Cretaceous accretionary complexes (Sorachi Group) which are overlain by Cretaceous forearc basin clastic rocks (Yezo Group).…”

Section: Geological Setting In and Around The Source Region Of The Homentioning

confidence: 99%

“…The units from the SYB to Hmz were also formed by the westward subduction. On the other hand, the Ynz and the Tokoro Belt (TB) are accretionary complexes of northward or eastward subduction along the paleo-Kuril arc-trench system in Paleogene and Cretaceous, respectively (Kiminami and Kotani 1983;Niida and Kito 1986;Nanayama et al 1993;Ueda 2016).…”

Section: Geological Setting In and Around The Source Region Of The Homentioning

confidence: 99%

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Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake

Iwasaki

Tsumura

Ito

et al. 2019

Earth Planets Space

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The Hokkaido Eastern Iburi Earthquake (M = 6.7) occurred on Sep. 6, 2018 in the southern part of Central Hokkaido, Japan. Since Paleogene, this region has experienced the dextral oblique transpression between the Eurasia and North American (Okhotsk) Plates and the subsequent collision between the Northeast Japan Arc and the Kuril Arc due to the oblique subduction of the Pacific Plate. This earthquake occurred beneath the foreland fold-and-thrust belt of the Hidaka Collision zone developed by the collision process, and is characterized by its deep focal depth (~ 37 km) and complicated rupture process. The reanalyses of controlled source seismic data collected in the 1998-2000 Hokkaido Transect Project revealed the detailed structure beneath the fold-and-thrust belt, and its relationship with the aftershock activity of this earthquake. Our reflection processing using the CRS/MDRS stacking method imaged for the first time the lower crust and uppermost mantle structures of the Northeast Japan Arc underthrust beneath a thick (~ 5-10 km) sedimentary package of the fold-and-thrust belt. Based on the analysis of the refraction/wideangle reflection data, the total thickness of this Northeast Japan Arc crust is only 16-22 km. The Moho is at depths of 26-28 km in the source region of the Hokkaido Eastern Iburi Earthquake. Our hypocenter determination using a 3D structure model shows that most of the aftershocks are distributed in a depth range of 7-45 km with steep geometry facing to the east. The seismic activity is quite low within the thick sediments of the fold-thrust belt, from which we find no indication on the relationship of this event with the shallow (< 10-15 km) and rather flat active faults developed in the fold-and-thrust belt. On the other hand, a number of aftershocks are distributed below the Moho. This high activity may be caused by the cold crust delaminated from the Kuril Arc side by the arc-arc collision, which prevents the thermal circulation and cools the forearc uppermost mantle to generate an environment more favorable for brittle fracture. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Geological Setting In and Around The Source Region Of The Homentioning

confidence: 99%

Section: Geological Setting In and Around The Source Region Of The Homentioning

confidence: 99%

Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake

Iwasaki

Tsumura

Ito

et al. 2019

Earth Planets Space

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“…(Ando, ; Kiminami, Shibata, & Uchiumi, ; Miyashita & Katsushima, ; Tajika, ); 9. (Kiminami & Kontani, ; Kimura & Tamaki, ; Morijiri & Nakagawa, ; Shibata, ); 10. (Kurita & Tajika, ; Naruse, ; Okada & Kaiho, ); 11.…”

Section: Early Cenozoic Geological Gap Other Than the Shimanto Belt Imentioning

confidence: 99%

Origin of the early Cenozoic belt boundary thrust and Izanagi–Pacific ridge subduction in the western Pacific margin

et al. 2019

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The belt boundary thrust within the Cretaceous-Neogene accretionary complex of the Shimanto Belt, southwestern Japan, extends for more than~1 000 km along the Japanese islands. A common understanding of the origin of the thrust is that it is an out of sequence thrust as a result of continuous accretion since the late Cretaceous and there is a kinematic reason for its maintaining a critically tapered wedge. The timing of the accretion gap and thrusting, however, coincides with the collision of the Paleocene-early Eocene Izanagi-Pacific spreading ridges with the trench along the western Pacific margin, which has been recently re-hypothesized as younger than the previous assumption with respect to the Kula-Pacific ridge subduction during the late Cretaceous. The ridge subduction hypothesis provides a consistent explanation for the cessation of magmatic activity along the continental margin and the presence of an unconformity in the forearc basin. This is not only the case in southwestern Japan, but also along the more northern Asian margin in Hokkaido, Sakhalin, and Sikhote-Alin. This Paleocene-early Eocene ridge subduction hypothesis is also consistent with recently acquired tomographic images beneath the Asian continent. The timing of the Izanagi-Pacific ridge subduction along the western Pacific margin allows for a revision of the classic hypothesis of a great reorganization of the Pacific Plate motion between~47 Ma and 42 Ma, illustrated by the bend in the Hawaii-Emperor chain, because of the change in subduction torque balance and the Oligocene-Miocene back arc spreading after the ridge subduction in the western Pacific margin.

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“…For the studied area, very complicated features in geology have been reported by OKADA (1983), KIMINAMI andKONTANI (1983), andCADET andCHARVET (1983). Figure 2 shows the geological map simplified by the author, on the basis of the reports.…”

Section: Geology and Bouguer Anomaliesmentioning

confidence: 67%

Velocity structure and aftershock distribution of the 1982 Urakawa-Oki Earthquake.

Miyamachi

Moriya

1987

J,Phys,Earth

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Mesozoic Arc-Trench Systems in Hokkaido, Japan

Cited by 28 publications

References 24 publications

Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake

Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake

Origin of the early Cenozoic belt boundary thrust and Izanagi–Pacific ridge subduction in the western Pacific margin

Velocity structure and aftershock distribution of the 1982 Urakawa-Oki Earthquake.

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