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
| Autor: | Naoshi Hirata, Kazuko Suzuki, Susumu Abe, Matsubara Makoto, Kazunori Arita, Tanio Ito, Shinsuke Kikuchi, Hiroshi Sato, Katsuya Noda, Takaya Iwasaki, Akira Fujiwara, Eiji Kurashimo, Noriko Tsumura |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Hokkaido
010504 meteorology & atmospheric sciences Hypocenter lcsh:Geodesy Seismic structure Active fault 010502 geochemistry & geophysics 01 natural sciences Arc–arc collision Foreland basin Forearc Aftershock 0105 earth and related environmental sciences geography lcsh:QB275-343 geography.geographical_feature_category Subduction lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation Geology The Hokkaido Eastern Iburi Earthquake Collision zone lcsh:Geology Fold-and-thrust belt lcsh:G Space and Planetary Science Fold and thrust belt Controlled source seismic experiments Seismology |
| Zdroj: | Earth, Planets and Space, Vol 71, Iss 1, Pp 1-19 (2019) |
| ISSN: | 1880-5981 |
| DOI: | 10.1186/s40623-019-1081-z |
| Popis: | 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 ( |
| Databáze: | OpenAIRE |
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