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Journal Articles

Seismic subsidence near the source region of the 1662 Kanbun Hyuganada Sea earthquake; Geochemical, stratigraphical, chronological, and paleontological evidences in Miyazaki Plain, southwest Japan

Niwa, Masakazu; Kamataki, Takanobu*; Kurosawa, Hideki*; Kokubu, Yoko; Ikuta, Masafumi*

Island Arc, 29(1), p.e12341_1 - e12341_26, 2020/01

 Times Cited Count:0 Percentile:100(Geosciences, Multidisciplinary)

Based on detailed geochemical and paleontological analyses for lowland sediments in the Miyazaki Plain, southwest Japan, we clearly identified environmental change from the lower terrestrial sediments to the upper shallow marine sediments. Radiocarbon ages and tephra data suggest that the environmental change is attributed to local subsidence due to the 1662 Kanbun Hyuganada Sea Earthquake shown in historical records. This findings are important for historical earthquake studies because the study area is a part of the expected focal region of megathrust earthquakes along the Nankai Trough.

Journal Articles

Event deposits recorded in coastal lowland areas of Ajigasawa Town, Aomori Prefecture

Kumagaya, Shuhei*; Umeda, Koji*; Kamataki, Takanobu*; Koiwa, Naoto*; Fujita, Natsuko

Tohoku Chiiki Saigai Kagaku Kenkyu, 53, p.7 - 13, 2017/03

no abstracts in English

Journal Articles

Identification of pumice derived from historic eruption in the same volcano; Case study for the Sakurajima-Bunmei tephra in the Miyazaki Plain

Ikuta, Masafumi*; Niwa, Masakazu; Danhara, Toru*; Yamashita, Toru*; Maruyama, Seiji*; Kamataki, Takanobu*; Kobayashi, Tetsuo*; Kurosawa, Hideki*; Kokubu, Yoko; Hirata, Takafumi*

Chishitsugaku Zasshi, 122(3), p.89 - 107, 2016/03

We carried out mineral composition analysis, morphological classification of volcanic glass shards and refractive index measurements of the glass shards and orthopyroxene from the eruption products from Sakurajima volcano. In this study, refractive indexes of hydrated and non-hydrated parts within each individual glass shard were measured separately. This measurements in consideration of hydration in glass shards made possible distinct discrimination of the pumice samples from the three eruption events of Bunmei, An-ei, and Taisho. Pumice layers in the core samples obtained from the southern part of the Miyazaki Plain were also identified as the Sakurajima-Bunmei tephra by the above mentioned analyses, and also by the data of radiocarbon dating for coaly materials included in the pumice layers. Occurrences of the pumice layers suggest that the Sakurajima-Bunmei tephra could have reached the southern part of Miyazaki Plain as pumice falls.

JAEA Reports

Analytical data of Holocene sediments in the Miyazaki Plain, Southern Kyushu, Japan

Ikuta, Masafumi; Niwa, Masakazu; Takatori, Ryoichi*; Kamataki, Takanobu*; Kurosawa, Hideki*

JAEA-Data/Code 2014-002, 246 Pages, 2014/06

JAEA-Data-Code-2014-002-01.pdf:17.7MB
JAEA-Data-Code-2014-002-02.pdf:49.07MB
JAEA-Data-Code-2014-002-03.pdf:39.02MB
JAEA-Data-Code-2014-002-04.pdf:36.25MB
JAEA-Data-Code-2014-002-05.pdf:22.17MB
JAEA-Data-Code-2014-002-appendix(DVD).zip:1642.4MB

The Miyazaki Plain, facing the Hyuga-nada, had been attacked repeatedly by historical tsunami events induced by the giant earthquakes centered in the Hyuga-nada or Nankai Trough. However, scientific studies concerning the tsunami events are still poor in this area. Disappearance of subsurface sediments due to fast uplift rates in the Miyazaki Plain is considered to make difficult to proceed such studies. This database shows the result of the study for Holocene sediments in the Miyazaki Plain in 2012, including chemical composition analysis of absorbed water, microfossil identification, description of tephra deposits and radiocarbon dating, as well as geological description of drilled cores. It is closely related to the study for the reactivation of coastal geological faults caused by the giant subduction zone earthquakes.

JAEA Reports

Annual report for research on long-term stability of geological environment in FY2006

Nohara, Tsuyoshi; Umeda, Koji; Sasao, Eiji; Hanamuro, Takahiro; Saito, Tatsuo; Yasue, Kenichi; Niwa, Masakazu; Mashima, Hidehisa*; Shimada, Koji; Yamada, Kunimi; et al.

JAEA-Research 2008-062, 61 Pages, 2008/07

JAEA-Research-2008-062.pdf:39.02MB

The Japanese islands are located in the tectonically active Circum-Pacific Mobile Belt. As a result, Japan has a high frequency of earthquakes and eruptions. Special consideration is given to the long-term stability of the geological environment in Japan. Development of research/prediction technologies for geotectonic events has been carried out to evaluate the long-term stability of the geological environment in Japan. During fiscal year 2006, we carried out the following researches, to confirm existence of the phenomena that have influences on geological disposal system, and to develop the research techniques to reconstruct the history of these phenomena. For studies of active faulting and seismic activity, we reviewed the existing techniques to research past activities and distribution of active faults (migration, extension, development process of a deformation zone). For volcanological and geothermal studies, we extracted a technique for detecting crustal magma and/or geothermal fluid in deep underground using geophysical and geochemical data, and models assessing the likelihood of future volcanism and its influence on geological environment. For studies of uplift/denudation and climatic/sea-level change, we constructed conceptual models such as landform development model.

Journal Articles

Sedimentological time-averaging and $$^{14}$$C dating of marine shells

Fujiwara, Osamu; Kamataki, Takanobu*; Masuda, Fujio*

Nuclear Instruments and Methods in Physics Research B, 223-224, p.540 - 544, 2004/08

 Times Cited Count:14 Percentile:31.18(Instruments & Instrumentation)

The radiocarbon dating of sediments using marine shells involves uncertainties due to the mixed ages of the shells mainly attributed to depositional processes also known as sedimentological time-averaging. This stratigraphic disorder can be removed by selecting the well-preserved indigenous shells based on ecological and taphonomic criteria. These criteria on sample selection are recommended for accurate estimation of the depositional age of geologic strata from 14C dating of marine shells.

Oral presentation

Tsunami deposits are recognized by shallow-marine faunal assemblages

Kamataki, Takanobu; Fujiwara, Osamu*

no journal, , 

no abstracts in English

Oral presentation

Regional hydrogeological analysis factored in tectonics and climatic changes; Case study in Tono Area, Gifu Prefecture

Kawaguchi, Tatsuya*; Saegusa, Hiromitsu; Niwa, Masakazu; Shimada, Koji; Yasue, Kenichi; Kurosawa, Hideki; Kamataki, Takanobu*; Tosaka, Hiroyuki*

no journal, , 

no abstracts in English

Oral presentation

Long-term change of discharged groundwater in the northern part of Awaji Island after the Hyougo-ken Nanbu Earthquake

Kusano, Tomohiro; Kamataki, Takanobu*

no journal, , 

To examine a period to need it in recovery after the earthquake of discharged groundwater by earthquake, in the northern part of Awaji Island that passed from Hyogo-ken Nanbu Earthquake in about 13 years, I analyzed chemical composition of discharged water, oxygen and hydrogen isotopic ratios of discharged water and measured quantity of discharged water.

Oral presentation

Groundwater flow analysis with saltwater-freshwater interface and active fault in Awaji Island

Kawaguchi, Tatsuya*; Kusano, Tomohiro; Nohara, Tsuyoshi; Yasue, Kenichi; Kamataki, Takanobu*

no journal, , 

In this study, the ground water analysis that assumes presence of salt water and/or high conductivity fault zone has been taken place in northern Awaji Island using numerical simulation. The author has accumulated data from the case with boundary condition and without it. The result shows that in the case of considering presence of salt water, both hydraulic total head and flux of surface flow has increased. A part of the point where large amount of discharge is shown by the analysis is corresponding to the point where spring water is confirmed by the field investigation. A part of the analytical result with continuous high conductivity zone is assumed discord with the result of the field investigation.

Oral presentation

Feature of coseismic groundwater change in north part of the Awaji Island

Nohara, Tsuyoshi; Kusano, Tomohiro; Kawaguchi, Tatsuya*; Kamataki, Takanobu*

no journal, , 

Coseismic remarkable decreases of water level are observed repeatedly in the same point with the distant earthquakes. Coseismic water level changes in the focal regions with some large earthquakes tend to increase in discharge area and decrease in recharge area. These features of coseismic changes indicate that the effect of coseismic increases of permeability have a large role in the change of the regional groundwater flow system.

Oral presentation

Extraction of information on the sedimentary basin using satellite data set

Kamataki, Takanobu*; Tateishi, Ryo*; Yasue, Kenichi

no journal, , 

no abstracts in English

Oral presentation

Approach for understanding the Holocene upheaval and subsidence in the Miyazaki Plain

Niwa, Masakazu; Ikuta, Masafumi; Takatori, Ryoichi; Kamataki, Takanobu*; Kurosawa, Hideki*

no journal, , 

Holocene uplift rate of the Miyazaki Plain was estimated based on the elevations and depositional ages of four terrace surface (Shimotajima I to IV surfaces; Nagaoka et al., 1991). However, age data are still poor except for the Shimotajima I surface. We report new data of detailed description of abandoned lagoon sediments of the Shimotajima II to IV surfaces.

Oral presentation

Depositional paleoenvironment and a historical earthquake in the Miyazaki plain, south Kyushu, Japan

Ikuta, Masafumi; Niwa, Masakazu; Takatori, Ryoichi*; Kamataki, Takanobu*; Tanabe, Hiroaki; Kurosawa, Hideki*

no journal, , 

After the 2011 Tohoku Earthquake, probability and scale of giant earthquakes in the sea off Japan have been re-examined. The Central Disaster Management Council of Japan proposed a source model of hypothetical Nankai trough giant earthquake including the Hyuganada region. Historical data show that the 1662 Hyuganada Earthquake caused tsunami inundating the offshore part of the Miyazaki City and subsidence of about 1m. Here we began first geological survey to examine the geological evidence showing such giant earthquake in the Miyazaki City. In this study, we identified the changes of the depositional environment indicating the regional subsidence due to the 1662 historical earthquake.

Oral presentation

Research on geosphere stability for long-term isolation of radioactive waste; Development of models for long-term estimation and effective assessment

Ikuta, Masafumi; Niwa, Masakazu; Kamataki, Takanobu*; Takatori, Ryoichi*

no journal, , 

no abstracts in English

Oral presentation

Subsidence and a change of depositional environment by the 1662 Hyuganada earthquake in southern Miyazaki Plain

Ikuta, Masafumi; Sato, Yoshiki; Niwa, Masakazu; Kamataki, Takanobu*; Kurosawa, Hideki*; Takatori, Ryoichi*

no journal, , 

A lot of great earthquakes have caused in the Hyuganada and the Nankai trough. According to historical records of documents, the 1662 Kanbun Hyuganada earthquake, had caused serious damage and natural calamity. Around the estuary of the Kaeda-gawa River, the tsunami had reached to about 4 to 5meter height, and ground subsided about 1meter.Shimayama region which is located in the estuary of the Kaeda-gawa River, was formed an intrusive arm of the sea occurred by this subside event. Some historical records of documents and landscape pictures show that the 1662 Kanbun Hyuganada earthquake changed topography and depositional environment in this area extremely. However, there is no case study of this evidence. So, we did multiple borings in the abandoned lagoon sediments and tried to restore depositional environment around the subsided area by some analysis methods such as microfossils and chemistry to use boring cores. These results will be presented in this session.

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