Fission-track ages of the Middle to Lower Pleistocene Momooka Formation in the Isawa Fan area of the Kitakami Lowland, Northeast Japan.

雅之, 大石; 裕生, 吉田

doi:10.5575/geosoc.101.825

Jour. Geol. Soc. Japan

1995

DOI: 10.5575/geosoc.101.825

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Fission-track ages of the Middle to Lower Pleistocene Momooka Formation in the Isawa Fan area of the Kitakami Lowland, Northeast Japan.

大石雅之¹,

吉田裕生²

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Tectonic Geomorphology and Subsurface Structure of the Ichinoseki–Ishikoshi Flexure Line, Northeast Japan

Kagohara

Tashiro

Kosaka³

et al. 2016

Journal of Geography(Chigaku Zasshi)

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We should understand the earthquake potential in and around Quaternary fault zones, in view of recent destructive inland earthquakes at previously unknown active fault zones in Japan. The Senpoku Plain and its surrounding areas are characterized by high seismic activity in northeast Japan, highlighted by four destructive earthquakes, M 6.8 in 2008, M 6.4 in 2003, M 6.5 in 1962, and M 7.0 in 1900, which occurred during the past 100 years, although few geomorphic features indicate active faulting. A comprehensive survey was conducted on the tectonic geomorphology in the area to understand the structural and geomorphic expression of the Ichinoseki-Ishikoshi Flexure Line （IIFL） , which suggests Quaternary activity. Geological and geomorphical mapping shows that the IIFL is located between the Kitakami Lowland Fault Zone and the Senpoku Plain. The IIFL extends about 30 km from Isawa to Ishikoshi with a slightly sinuous trace. A high-resolution seismic reflection profile and a gravity profile define the subsurface geometry of the IIFL. The IIFL is interpreted to be a steeply west-dipping reverse fault. The Pliocene Kazawa and Yushima Formations typically dip 40° to 20°E along the IIFL, and are overlain by the Pleistocene Mataki Formation, which becomes thinner toward the fold axis of the IIFL, and their dips decrease progressively upward. This suggests that the Mataki Formation was deposited concurrently with fault activity of the IIFL. Fission-track dating of a tuff layer within the uppermost section of the Kazawa Formation indicates that active reverse faulting of the IIFL began at about 2 Ma. At least 280 m of the tectonic uplift is consumed by

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Tectonic Geomorphology and Subsurface Structure of the Ichinoseki–Ishikoshi Flexure Line, Northeast Japan

Kagohara

Tashiro

Kosaka³

et al. 2016

Journal of Geography(Chigaku Zasshi)

View full text Add to dashboard Cite

show abstract

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Fission-track ages of the Middle to Lower Pleistocene Momooka Formation in the Isawa Fan area of the Kitakami Lowland, Northeast Japan.

Cited by 1 publication

References 1 publication

Tectonic Geomorphology and Subsurface Structure of the Ichinoseki–Ishikoshi Flexure Line, Northeast Japan

Tectonic Geomorphology and Subsurface Structure of the Ichinoseki–Ishikoshi Flexure Line, Northeast Japan

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Fission-track ages of the Middle to Lower Pleistocene Momooka Formation in the Isawa Fan area of the Kitakami Lowland, Northeast Japan.

Cited by 1 publication

References 1 publication

Tectonic Geomorphology and Subsurface Structure of the Ichinoseki&ndash;Ishikoshi Flexure Line, Northeast Japan

Tectonic Geomorphology and Subsurface Structure of the Ichinoseki&ndash;Ishikoshi Flexure Line, Northeast Japan

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Product

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Tectonic Geomorphology and Subsurface Structure of the Ichinoseki–Ishikoshi Flexure Line, Northeast Japan

Tectonic Geomorphology and Subsurface Structure of the Ichinoseki–Ishikoshi Flexure Line, Northeast Japan