Faculty Profiles - URABE Atsushi

Papers - URABE Atsushi

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Middle to upper Pleistocene formations around Lake Kamo, Sado Island, Japan Reviewed

Collaborative Research Group of the Kuninaka Formation

Earth Science (Chikyu Kagaku) 53 ( 5 ) 340 - 358 1999.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

The middle to upper Pleistocene formations distributed around Lake Kamo, Sado Island, are divided into the Ryotsu First, Ryotsu Second. Ryotsu Third, and Ryotsu Forth Terrace Deposits, and Ryotsu Younger Fan Deposit in ascending order. The Ryotsu Third Terrace Deposit called the Katabata Formation, intercalates the Katabata volcanic ash and the drifted pumices which are correlated with Kitsugi pumice fall deposit (K3) and Sambe-Kitsugi tephra (SK), respectively. The Ryotsu Forth Terrace Deposit is called the Agata Formation, and contains the Agata volcanic ash which may be correlated with the On-Pm1 or Pm-1A tephra. Brown-colored eolian soil deposits cover the terrace deposits, and are divided into the A to D Members in ascending order. Volcanic ash layers in these members are correlated with the marker tephras as follows: Akasaka B1 ash to On-Kt, Akasaka B2 ash to Aso-4, Akasaka B3 ash to DKP, Akasaka C ash to AT, Akasaka D ash to As-K. On the basis of relationship between the terrace deposits and these marker tephras, the Katabata and Agata Formations are correlated with the Shimosueyoshi and Obaradai Formations in the Kanto Plains, respectively. Depositional sequence of upper part of the Katabata Formation shows a typical upward-coarsening succession, and was formed by progradation of fan delta system. The altitude of foreshore sediments tend to become lower northward. This suggests that they are deposited at the regressive stage. The lower sequence of the Agata Formation shows a typical upward-finning succession. The upper sequence of the Agata Formation shows upward-coarsening succession in the northern part, while the sequence in the southern part includes nearshore and coastal plain facies, lacking foreshore facies. Depositional facies change of the Agata Formation shows a transgressive-regressive cycle. The formation was in barrier-island and estuary or lagoon systems in the transgressive stage, and in coastal plain systems in the following regressive stage.

DOI： 10.15080/agcjchikyukagaku.53.5_340

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Neotectonics of Ojiya-Kawaguchi area, Niigata prefecture

Imai Hidehiro, Kamijo Hitoshi, Takahama Nobuyuki, Urabe Atsushi

Annual Meeting of the Geological Society of Japan 1999 112 - 112 1999

Guide book for excursion of Boso Peninsula Reviewed

Suzuki Y, Mitsunashi T, Kodama K, Shinada Y, Yamauchi S, Urabe A

International symposium on new concepts in global tectonics 0 - 56 1998.12

新潟県内の活断層と液状化跡 Reviewed

ト部厚志, 高濱信行

新潟の災害と防災 65 - 73 1998.12

Progradation and regressive surface of erosion — example in Upper Pleistocene Katabata Formation —

Tateishi M., Hatakeyama K., Kanzo K., Urabe A., Tanaka S.

Annual Meeting of the Geological Society of Japan 1998 P038 1998

中国西南部雲南省元謀盆地の後期新生代の層序と堆積環境 Reviewed

ト部厚志

Northern HemisphereGeo-Bio Traverse 4 45 - 60 1997.12

Stratigraphy and depositional sequences of the Pleistocene Toyofusa Group, southernmost part of the Boso Peninsula, central Japan(<Special Issue>Stratigraphy and Sedimentation of the Ouaternary System in Boso Peninsula, Japan) Reviewed

Urabe Atsushi

Earth Science (Chikyu Kagaku) 51 ( 2 ) 83 - 103 1997.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

A forearc basin fill of the Pleistocene Toyofusa Group in the southern part of the Boso peninsula, Japan is represented by slope to shelf sediments. The Toyofusa Group is subdivided into the Kanamaribata Formation, Ohi Formation, Higashinagata Formation, Takigawa Conglomerate, Sagashi Formation and Ikenouchi Formation in ascending order, and correlated with the middle and upper parts of the Kazusa Group. The slope to shelf sediments form a northeasterly onlapping clastic wedge and include many numbers of volcanic ash layers. Mapping of depositional associations with tracing volcanic ash time marker, together with the interpretation of depositional facies, permits identification of stratal terminations and of temporal-spatial variations of depositional environments. These enabled a precise sequence-stratigraphic analysis of the sediments of the Toyofusa Group. Seven depositional sequences have been identified in the Toyofusa Group. Each the depositional sequences show lateral terminations of depositional facies and vertical facies discontinuities at the sequence boundaries. These depositional sequences consist of complete or incomplete assemblages of fundamental components of lowstand, transgressive, and highstand systems tracts. Fission track and paleo-magnetic ages for the Toyofusa Group showed that the depositional sequences can be correlated with oxygen isotope stages of 15 to 23. By the correlations, periodic formation of depositional sequences can be attributed to glacio-eustatic sea-level changes of about 40,000 to 100,000 years.

DOI： 10.15080/agcjchikyukagaku.51.2_83

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Damage Caused by the 1995 Hyogoken-Nanbu Earthquake and Concealed Faults in the Hanshin Area, Hyogo Pref., Japan

ENDO Hidenori, WATANABE Shiro, MAKINO Masahiko, MURATA Yasuaki, WATANABE Kazuaki, URABE Atsushi

The Quat. Res. 35 ( 3 ) 165 - 178 1996.7

Language：Japanese Publisher：Japan Association for Quaternary Research

The severest damage caused by 1995 Hyogoken-Nanbu Earthquake occurred within a narrow zone in the coastal plain between the Rokko mountains and Osaka Bay, from Kobe City to Nishinomiya City. The distribution map of the damage rate of houses indicates that the boundaries in which the damage rates change sharply lie on a straight line or segment. Seismic and gravity measurements were conducted to reveal the subsurface geological structure of this coastal plain. Seismic reflection surveys were carried out along two survey lines across the zone. The gravity measurements were made at 1, 824 points, most of which have a short interval of about 25m along observation lines. The following conclusions were derived from this study. (1) The seismic profiles show concealed faults below the shallow subsurface deposits in the coastal plain. (2) Remarkably steep gradients of Bouguer anomalies are distributed along the boundary of the Rokko mountains and the plain. (3) Estimation of the gravity structure shows that the basement dips steeply toward Osaka Bay, and that the largest step with concealed faults exists in the coastal plain. The distribution of the damage rate of houses is consistent with the location of the concealed faults. In particular, the northern boundary of the severely damaged zone is situated nearly on the largest step of the basement structure. Therefore, it is concluded that the subsurface geology with concealed faults caused the seismic disaster in the coastal plain.

DOI： 10.4116/jaqua.35.165

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Other Link： https://jlc.jst.go.jp/DN/JALC/00041807279?from=CiNii

202. Transgressive depositional systems and relative sea level changes of the Plio-Pleistocene Uonuma Group, Niigata, central Japan

Urabe Atsushi, Tateishi Masaaki, Kazaoka Osamu

Annual Meeting of the Geological Society of Japan 1995 185 - 185 1995

Ash fall deposits included in brown soil of the Sado Island, Niigata Prefecture, Japan

Watanabe Hideo, Arakawa Katsutoshi, Terasaki Kouiti, Kanzou Katsuaki, Urabe Atsushi, Tateishi Masaaki

Earth Science (Chikyu Kagaku) 48 ( 1 ) 51 - 56 1994

201. High-frequency depositional sequences of the Toyofusa Group in the southern part of the Boso Peninsula,Japan

URABE Atsushi

Annual Meeting of the Geological Society of Japan 1994 148 - 148 1994

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