Faculty Profiles - URABE Atsushi

Re-examination of the damage distribution and the source area of the 1751 Takada Earthquake Reviewed

Other Link： https://jlc.jst.go.jp/DN/JALC/10027165606?from=CiNii

Deposition by the 2011 Tohoku-oki tsunami on coastal lowland controlled by beach ridges near Sendai, Japan Reviewed

Yasuhiro Takashimizu, Atsushi Urabe, Koji Suzuki, Yoshiki Sato

SEDIMENTARY GEOLOGY 282 124 - 141 2012.12

2011年度（平成23年度）東北地方太平洋沖地震に伴う津波堆積物の緊急調査速報：仙台平野を遡上した津波による堆積物の例

高清水康博, 卜部厚志, 鈴木幸治

Annual Report of Resarch Institue for Natural Hazards and Disaster Recovery, Niigata University ( 1 ) 79 - 80 2012.10

YATA Toshifumi, URABE Atsushi

The study of primary sources ( 8 ) 1 - 23 2011.3

北陸の地体構造と地震・地震災害--これからの地震防災に向けて-- Reviewed

竹内章, 平松良浩, 卜部厚志

地盤工学会誌 59 ( 2 ) 8 - 11 2011

Influence of a volcanogenic flood event on an alluvial depositional system: the Holocene Echigo Plain of northeast Japan Reviewed

Urabe Atsushi, Fujimoto Yusuke, Kataoka Kyoko S.

Jour. Geol. Soc. Japan 117 ( 9 ) 483 - 494 2011

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Geological Society of Japan

The Echigo Plain, which faces the Sea of Japan in northeast Japan, is a typical coastal plain with numerous sand dunes. We examined the sedimentology of pumiceous sediments (lahar deposits) in the Agano River area of the Echigo Plain, derived mainly from a large-scale dam-break flood after the Numazawako eruption (about 5 ka), using an existing borehole dataset and facies analysis of sediment cores.<br>The lahar deposits show different sedimentary facies in coastal areas versus the shallow marine environment. Coarse-grained pumiceous sediments (5—8 m thick) are interpreted to have been deposited under the delta front or in a delta plain environment in a coastal area. Sandy silt deposits (pro-delta facies), including pyroclastic material (horizons of concentrated volcanic glass shards and heavy minerals), are distributed in the shallow sea area.<br>The large volumes of volcaniclastic sediment delivered during the flood event induced the rapid progradation of the delta system in the Agano River region. The deposition of volcaniclastic sediments in the shallow sea also caused progradation of the delta system and changed the coastal landforms along the margin of the Echigo Plain.<br>The flood event resulted in an increase in the progradation rate of the depositional system from 0.9 to 2.5 km per 1000 years. An understanding of large-scale pyroclastic resedimentation can contribute to evaluating and predicting the volume of sediment discharge and the nature of hazards created by a volcanogenic flood and its aftermath in an alluvial plain setting.

DOI： 10.5575/geosoc.117.483

Re-examination of the damage distribution and the source area of the 1828 Sanjo Earthquake Reviewed

Other Link： https://jlc.jst.go.jp/DN/JALC/00380388842?from=CiNii

Sedimentary facies and accumulation rate of the incised-valley fills in the Echigo Plain, central Japan

Funabiki Ayako, Miyachi Yoshinori, Urabe Atsushi, Kamoi Yukihiko

Annual Meeting of the Geological Society of Japan 2011 339 - 339 2011

1828年三条地震における与板町の被害

矢田俊文, 卜部厚志

災害と資料 ( 4 ) 2010.3

YATA Toshifumi, URABE Atsushi

The study of primary sources ( 7 ) 1 - 14 2010.3

Holocene activity of the Kakuda-Yahiko fault in the western margin of the Niigata Plain, based on sediment core analysis Reviewed

Nakanishi Toshimichi, Miyachi Yoshinori, Tanabe Susumu, Urabe Atsushi, Yasui Satoshi, Wakabayashi Toru

Active Fault Research 32 ( 32 ) 9 - 25 2010

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society for Active Fault Studies

The Kakuda-Yahiko fault is a west-dipping blind thrust along the western margin of the Niigata plain, central Japan. The slip rate has not clearly estimated because the fault is buried under thick sediments. We obtained and analyzed three core samples (GS-KNM-1, GS-SGT-1, and AK-1) crossing the fault, and we recognized the Holocene vertical movement on the basis of correlation of detailed description, radiocarbon ages, and diatom assemblages. Based on these analyses, we interpreted nine sedimentary facies: the late Pleistocene marine sediments, meandering river sediments, salt to freshwater marsh sediments, offshore sediments, lower and upper shoreface sediments, foreshore sediments, modern river sediments, dune sediments, and surface soils, in ascending order. The average vertical-slip rate is estimated 3.6-4.6 mm/yr based on the vertical-offsets of the ravinement surface dated 9.4-8.2 cal kyr BP and the pumice layer dated 6-5 cal kyr BP. However, this slip rate might contain at best 1.3 mm/yr compaction effects of unconsolidated muddy sediments. Therefore, the average vertical-slip rate of Kakuda-Yahiko fault would be estimated about 3 mm/yr.

DOI： 10.11462/afr.2010.32_9

The Budokubo Collapse Basin on the Latest Pleistocene in relation with the 2004 Mid-Niigata Earthquake, central Japan

Seamless geo-information of the "Chuseki-so" across coastal zone of Niigata Plain, central Japan.

MIYACHI Yoshinori, URABE Atsushi, INOUE Takuhiko, AMANO Atsuko, KAGOHARA Kyoko, FUNABIKI Ayako, KIMURA Katsumi

Annual Meeting of the Geological Society of Japan 2010 83 - 83 2010

Borehole log database and shallow-level geologic model in the Niigata Plain

Funabiki Ayako, Kimura Katsumi, Miyachi Yoshinori, Urabe Atsushi, Kamoi Yukihiko

Annual Meeting of the Geological Society of Japan 2010 349 - 349 2010

Impacts of explosive volcanism on distal alluvial sedimentation: Examples from the Pliocene-Holocene volcaniclastic successions of Japan Reviewed

Kyoko S. Kataoka, Vern Manville, Takeshi Nakajo, Atsushi Urabe

SEDIMENTARY GEOLOGY 220 ( 3-4 ) 306 - 317 2009.10

Neotectonic Research Group of the Niigata Shinano River Region, Neotectonic Research Group of the Niigata Shinano River Region

Earth Science (Chikyu Kagaku) 63 ( 3 ) 167 - 181 2009

Language：Japanese Publisher：The Association for the Geological Collaboration in Japan

This paper presents the results of detailed studies of the Budokubo Collapse Basin, which was formed in the Latest Pleistocene. The basin is located in the northern part of Uonuma Hills, attacked by the 2004 Mid-Niigata Earthquake. The basin is surrounded by hills, and the topography of the basin is a polygon, 2km long and 1.5km wide. The Budokubo Formation within the basin is composed of irregularly alternating beds of gravels, sands and silts, intercalated with the Aira Tn tephra bed (AT; approx. 2.6〜2.9ka). The formation contains peat layers which characterized static slack - water environments. The marginal facies of the Budokubo Formation are poorly sorted, and the formation is in high-angle unconformable contact with Neogene basement. The investigation reveals that just before the Budokubo Collapse Basin was formed, the main stream of the Shinano River had run through the area studied. Four step fluvial terraced surfaces are recognizable in the basin. The forming process of the Budokubo Collapse Basin is considered as follows: At first, we estimate the land was uplifted more than 25m, in a larger area containing the studied area that included the Shinano River, so, the stream had its way blocked and took another course. Later, the land collapsed approximately 25m in this small area called Budokubo. The process and the scale of the Budokubo Collapse Basin are almost the same as those of the Tamugiyama Collapse Basin, about 5km south of the Budokubo Collapse Basin, an area reported on in 2006. Moreover, these basins were formed during the same period. These facts suggest that the upheaval movement preceding the collapse movement occurred in a wide range of the region including the two basins. The region is inferred to contain Yamamotoyama Block and the place where the Uono River joins the Shinano River, which are near the two basins. In the Yamamotoyama Block, the land has been vigorously uplifted since the Latest Pleistocene. Along the junctions of the smaller blocks within the uplifted region both rivers obviously wind their way. These phenomena apparently resulted from active movements like upheaval in this region. The geodetic survey data by the Geographical Survey Institute indicate that the area of the Budokubo Collapse Basin corresponds to the highest uplifted segment in the 2004 Mid-Niigata earthquake. The eleven step fluvial terraced surfaces show that active and intermittent upheaval movements repeatedly followed from the Late Pleistocene to Holocene in this area. Therefore, this sequence of active movements in this region appears to follow the 2004 Mid-Niigata earthquake.

DOI： 10.15080/agcjchikyukagaku.63.3_167

Holocene depositional systems along the Agano River of the Echigo Plain, central Japan Reviewed

Breakout flood from an ignimbrite-dammed valley after the 5 ka Numazawako eruption, northeast Japan Reviewed

Kataoka, K, Urabe, A, Manville, V, Kajiyama, A

Geological Society of America, Bulletin 120 ( 9/10 ) 1233 - 1247 2008.9

Urabe Atsushi

The Quaternary Research 47 ( 3 ) 191 - 201 2008.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Association for Quaternary Research

The Echigo Plain facing the Sea of Japan is a typical coastal plain covered by coastal sand dunes. Depositional systems along the lower Agano River have been clarified by the facies analysis of borehole datasets and by four newly obtained sediment cores. The upper parts of the alluvium in this area have been formed as a delta system with strong influence of the Agano River. This system is in contrast with a barrier-lagoon system, the subsiding area along the Shinano River in the Echigo Plain. Therefore, it is evident that the alluvium of the Echigo Plain has been formed by the progradation of two different depositional systems, a delta system under the influence of the Agano River and barrier-lagoon system under the impact of the Shinano River.

DOI： 10.4116/jaqua.47.191

Volcaniclastic resedimentation after the 50 ka ignimbrite eruption of Numazawa volcano along the Tadami and Agano Rivers, northest Japan

Other Link： https://jlc.jst.go.jp/DN/JALC/00315111699?from=CiNii

2007年新潟県中越沖地震による建物被害と地盤災害

卜部厚志, 高濱信行, 河島克久, 鈴木幸治, 和泉薫, 福留邦洋, 梶壮志, 本田孝子

新潟大学災害復興科学センター年報 ( 2 ) 135 - 163 2008.7

baba ayaka, urabe atsushi, kataoka kyoko.s

Annual Meeting of the Geological Society of Japan 2008 423 - 423 2008

The tectonic movement recognized in landform and sedimentation process of alluvial plain in the Niigata region

urabe atsushi

Annual Meeting of the Geological Society of Japan 2008 116 - 116 2008

Holocene diatom floras and environmental changes of lagoon-lake deposits in the northern Echigo Plain, central Japan Reviewed

YASUI Satoshi, FUJITA Tsuyoshi, KIMURA Hiroshi, WATANABE Isamu, YOSHIDA Mamiko, URABE Atsushi

Earth Scien 61 ( 1 ) 49 - 62 2007.12

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

A detailed diatom analysis of one drilling core was carried out in the Fukushima-gata Lagoon area of the northern part of the Echigo Plain, which is situated in the inlet side of the Kitakanbara-gata Lagoon. 11 diatom divisions were detected and correlated with divisions of the Shiunji-gata Lagoon area (Yasui et al. 2002) situated in the inside part of the Kitakanbara-gata Lagoon. The characteristics of diatom assemblages and Holocene sedimentary environments of the Kitakanbara-gata Lagoon are discussed in this paper. Diatom assemblages of the Kitakanbara-gata Lagoon were characterized by flourish or decline of several maker planktonic species. In the Fukushima-gata Lagoon area three types of diatom assemblage appeared repeatedly. The first type is dominated by Aulacoseira granulata, which indicates limnophilous fresh surface water, and may be caused by a closure of an inlet. The first type took the place of the second type dominating by Cyclotella caspia, which is caused by an inflow of marine water from an inlet opening. The third type is characterized by a low frequency of planktonic species, which indicates rheophilous fresh surface water or a reduction of water area. The Holocene sedimentary environments of the Kitakanbara-gata Lagoon are identified as follows on the basis of diatom divisions and ^<14>C datings. The Kitakanbara-gata Lagoon was under a brackish lake environment in ca. 8,000 yrs BP, and three periods of marine surface water expansion occurred at ca. 6,500, from ca. 6,000 to ca. 5,000 and at 3,500 yrs BP. In ca. 3,000 yrs BP, the connection of the water area between Fukushima-gata Lagoon and Shiunji-gata Lagoon areas in the Kitakanbara-gata Lagoon were disappeared.

DOI： 10.15080/agcjchikyukagaku.61.1_49