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  • 1
    Publication Date: 2022-04-07
    Description: When thinking about general use in waters, depth information is one of the necessar y pieces of information. By using a Web-GIS system such as the Maritime-domain-awareness (MDA) situational indication linkages, UMISHIRU, this can be effectively achieved. Unfortunately, the UMISHIRU does not itself have the depth information in. In this paper, we describe how to compile the depth data of the J-EGG500 and ETOPO1 and present the depth information in the UMISHIRU for the beginning UMISHIRU user.
    Description: Published
    Description: Refereed
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.120-133
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  • 2
    Publication Date: 2021-05-19
    Description: The Japan Marine Cadastre (JMC) is one of Web-GIS service systems that is operated through the Internet by the Japan Coast Guard (JCG). The JMC has many functions, including the importing of TXT, CSV and KML formats, and the compiling of a great deal of marine data obtained by the JCG. However, the JMC contains no historic and disastrous typhoon information, mainly the route data, which are published on the web site of the Japan Meteorological Agency (JMA). Instead, the JMC can import such typhoon route data and plot them on the display. This report describes how to map the JMA’s typhoon route data on the JMC to understand the historic disasters caused by them.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.109-125
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  • 3
    Publication Date: 2021-05-19
    Description: The northern margin of the Philippine Sea plate is marked by the Nankai Trough. The trough is known as one of the most active seismogenic zone in the world. However, the basic observations for prediction of giagntic earthquakes such as the detailed distribution of active faults have been lacking mainly due to insufficiency of data of the detailed submarine topography. To make a more precise submarine active fault map along the trough, we have made detailed submarine topographic images based on 3 second (approximately 90 m) DEM processed from the original data obtained by Japan Coast Guard since 1984 using multi−narrow beam echo sounder. Then we have made stereo−pair copies of topographic images for interpretation of active faults, in a similar manner we use in aerial photograph stereo sets for onland active faults. We have also prepared anaglyph images from the stereo−pairs for discussion.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 83-89
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  • 4
    Publication Date: 2021-05-19
    Description: A small eruption happened on February 3 at Fukutoku−Oka−no−ba Volcano in Volcano Islands, Japan. Topographic survey was conducted after the eruption by using “Manbo II”. At the top of the volcano, new vents were created, which is revealed by comparison with the pre−eruption topography. The erupted magma is unidentified but would be dacitic or rhyolitic, because of some obtained pumice. The discolored water has actively emerged in half years prior to the eruption, and the color of the discolored water changed from white to green and brown.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 9-13
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  • 5
    Publication Date: 2021-05-19
    Description: Diving survey was conducted on the mysterious sea knolls discovered in the southern part of the Yatsushiro Sea, Kagoshima, Japan. The sea knolls are 50 meters in diameter and 5 meters in relief, and 88 knolls are discovered in close proximity. A diving survey to reveal the nature of these knolls was conducted in February 2009. The most upper layer of the sea knoll is composed of sand and the surface is covered by the colony of a kind of oyster, “Hyotissa imbricata”. We proposed seven hypotheses for the origin of these knolls, although any clue sup porting these hypotheses was not obtained.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 96-102
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  • 6
    Publication Date: 2021-05-19
    Description: Asubmarine volcano was newly discovered near the Tokara Islands in the Okinawa Trough through a survey using amultibeam echo sounder. The volcano is located at 25km north to the Takara Shima Island and the water depth is about 300 to 500m. The volcano has a small caldera with a diameter of 1.6km, consisting of two central cones and nine craters.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 145-151
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  • 7
    Publication Date: 2021-05-19
    Description: In the commemoration of the 150th anniversary of the lighthouse in Japan, the value of lighthouses is currently under review. However, various initiatives and events are being conducted, and, as a result, pieces of information are disseminated separately and in a state that is not being efficiently communicated to the people. This could hinder the promotional activities of lighthouses of various organizations including the Japan Coast Guard. Therefore, in this report, we introduce a method for displaying various pieces of information on lighthouses together by using the Japan Marine Cadastre, based on which anyone can easily display information by converting it into data. In so doing, we are proposing a concrete usage example of the Japan Marine Cadastre and a usage method that can contribute to local promotional activities centering on the lighthouse.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.170-178
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  • 8
    Publication Date: 2021-05-19
    Description: Some active faults, active anticlines, and active synclines were discovered by the seismic reflection survey conducted off Niigata!Murakami including the epicenter of the 1964 Niigata Earthquake. Most active faults are distributed on the Awashima Uplift Zone and cut the erosion surface formed about 18, 000 years ago. The average slip rate of the fault near the earthquake fault of the 1964 Niigata Earthquake is over 0.56m/ka. Several normal faults detected under the Awashima Uplift Zone are supposed to be formed by the eastward tilting of the uplift.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 25-31
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  • 9
    Publication Date: 2021-05-19
    Description: Japan Coast Guard has been conducted bathymetric survey in the western part of Japan Sea with state−of− the−art multibeam echo sounders since fiscal year 2008. In 2010, the fault of 30 km length was discovered. It will be the extension of the Nishiyama Fault Zone in Fukuoka Prefecture.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 61-65
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  • 10
    Publication Date: 2021-05-19
    Description: The Hydrographic and Oceanographic Department of Japan Coast Guard actively has participated in TheVolcanic Eruption Prediction Plan since the Plan started in 1973. Observation of volcanic activities in the adjacent seas of Japan is very important,noto nly to protect safety navigation, fishery, and the other activities in the sea area against a disaster, but also to manage the sea area itself effectively. This list is a 4th edition of “List of volcanoes and their activities records in the adjacent seas of Japan.” During the pastseven years, small volcanic activities occurred at Satsuma-Iojima Volcano in 2005, Kuchinoerabujima Volcano in 2005, Nakanoshima Volcano in 2005, SuwanosejimaVolcano in 2006, Sakurajima Volcano in 2008, Fukutoku− OkanobaVolcano in 2010 and some fundamental data on geology and geophysics were newly collected from the surveys on Wakamiko Caldera, Kikai Caldera, Kaikata Volcano, Nakanoshima Volcano, and Fukutoku−Okanoba Volcano.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 41-73
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