scholarly journals Crustal structure of the Hidaka collision zone and its foreland fold-and-thrust belt, Hokkaido, Japan.

2000 ◽  
Vol 65 (1) ◽  
pp. 103-109 ◽  
Author(s):  
Tanio Ito
Keyword(s):  
Crustal Structure ◽  
Thrust Belt ◽  
Collision Zone ◽  
Fold And Thrust Belt ◽  
Hidaka Collision Zone

scholarly journals 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

2019 ◽  
Vol 71 (1) ◽  
Author(s):  
Takaya Iwasaki ◽  
Noriko Tsumura ◽  
Tanio Ito ◽  
Kazunori Arita ◽  
Matsubara Makoto ◽  
...  
Keyword(s):  
3D Structure ◽  
Focal Depth ◽  
Depth Range ◽  
Thrust Belt ◽  
Uppermost Mantle ◽  
Aftershock Activity ◽  
Collision Zone ◽  
Fold And Thrust Belt ◽  
Northeast Japan Arc ◽  
Hidaka Collision Zone

Abstract 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/wide-angle 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.

Crustal structure and tectonics of the Hidaka Collision Zone, Hokkaido (Japan), revealed by vibroseis seismic reflection and gravity surveys

1998 ◽  
Vol 290 (3-4) ◽  
pp. 197-210 ◽  
Author(s):  
Kazunori Arita ◽  
Takashi Ikawa ◽  
Tanio Ito ◽  
Akihiko Yamamoto ◽  
Matsuhiko Saito ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Seismic Reflection ◽  
Collision Zone ◽  
Hidaka Collision Zone

QUANTIFYING SHORTENING ACROSS THE CENTRAL APPALACHIAN FOLD-AND-THRUST BELT OF WEST VIRGINIA

2016 ◽  
Author(s):  
Daniel Benjamin Lammie ◽  
◽  
Peter B. Sak ◽  
Nadine McQuarrie
Keyword(s):  
West Virginia ◽  
Thrust Belt ◽  
Fold And Thrust Belt
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